The clunky remote of the new Smart System, flooded with buttons, is ergonomically one of the worst in the entire test it is only marginally improved upon by the Purion, another Bosch option. Today, eMTBs offer multiple levels of assistance that feel smooth and natural and many employ nearly silent motors. Clack-clack-clack, bzzz, bzzz youve probably heard it before. It is the right bike for sporty downhill junkies who dont want to lose any time on the forest tracks on the way to the start of the toughest trails. That way, a glance is all it takes to see whether the bike might be what youre looking for. Its recommended to set up the rear shock with 30-35% sag, and Rockys suggested pressure of 190psi for my 68kg weight proved to be spot-on, putting me at the lower end of that sag range. The bar has a fantastic profile with a suitable width and rise, the WTB saddle is totally agreeable, the Shimano I-Spec mounts are tidy, and the ODI grips are a really nice touch. We think giving points according to a rigid scoring system isnt the most helpful approach since it oversimplifies this very complex topic and doesnt do it justice. Complementing the new drive unit are two completely redesigned modelsthe trail-focused, 140mm-travel Instinct Powerplay and the 160mm-travel, e nduro-oriented Altitude Powerplay. We emptied 17 bottles of Vino Rosso at the joint dinners, namely the, 12 bottles of Vino Bianco were also included, namely. - Mid-high pivot Smoothlink rear suspension design NEW: Before we get into the review, we would like to tell you about our latest print edition. As a pedal-assisted e-mountain bike, the Rocky Mountain Altitude Powerplay Alloy 70 is powered by a Dyname 4.0 Mountain Bike Drive, 250W nominal power, 880W peak power, 108Nm max torque motor and a Li-Ion, integrated, removable; compatible with second Overtimepack battery (314 Wh), 720 Wh battery. If youre an experienced rider looking for more juice, the Powerplay is your play. Introducing the new CUBE Stereo Hybrid ONE55 eMTB An ebike outside the box? In this group test, we looked for the best trail all-rounder that shines on every trail and delivers the best overall package of handling, uphill, downhill and touring performance, design, motor, specs, battery concept and detailed solutions. However, there are some compromises when it comes to stability through fast trail sections and traction. And while the big 38 is a great match, providing a solid and secure platform up front, it isnt as supple or as well supported compared to the higher-end versions that feature the more complex GRIP2 damper. Software topics such as connectivity or motor customisation/tuning also played an important role. Its a little lacking in features compared to Specializeds MasterMind TCU display theres no phone connectivity, and it doesnt display metrics like ride time or altitude. Ive not suffered a single puncture throughout testing, and while there a number of small dents in the rear rim, the tough tyres and CushCore inserts have shielded them from the worst abuse. This Brand is Putting a New Spin on Massage Guns, The Best Running Jackets for Cooler Weather, Here's the Skinny on Ooni's Electric Pizza Oven, The Best New Style Releases from 2023 (So Far), All the Boxing and Fitness Gear from Creed III, Tesla Investor Day: 5 Things You Need to Know, Rocky Mountain Altitude Powerplay Carbon 90 Rally Edition. Thats why we prefer to provide you with some concrete tips here. The new 2022 Instinct Powerplay The Instinct Powerplay is Rocky's Trail/All Mountain platform with 140mm of rear travel, paired with a 150mm fork. In general, availability still poses major challenges for the industry in 2022. The advantages are obvious: more drop means easier mounting and dismounting as well as more freedom of movement and safety on the trail. The super varied route included steep climbs and descents, winding, straight, technical and easy sections. Altitude Powerplay Carbon 90 Rally Edition: $13,129 CAD . If there is one bike that will convert diehard enduro riders into e-bike junkies, the Levo SL is it. Firstly, this motor is incredibly responsive. The Altitude Powerplay's linkage does have one significant difference from other Rocky MTBs, and that's the mid-high main pivot location. Regardless of price or material, all models are equipped with the same Dyname 4.0 motor and 720Wh battery, and feature the same 8-way adjustable geometry. The dropper should have as much travel as possible. A steel chainring surely makes more sense for an e-MTB. If you want to chase over trails at high speed, it wont be. YETI have combined all their geometry and suspension know-how in a great overall package powered by a Shimano EP8 motor and 630 Wh battery, creating a bike that is the new benchmark in trail performance, for everyone from beginners to pros. They are your only contact with the ground and influence traction, braking distances and the handling of your bike, as well as contributing to its suspension. In terms of connectivity and customisability of the motor system, it sets the tone in the test field together with the Specialized S-Works Turbo Kenevo SL. The Altitude Powerplay Alloy 50 has a better fork and more travel, while the Turbo Levo Comp Alloy has 29 / 27.5 aluminum wheels and better components. These stop providing assistance after the bike reaches 20mph or more. The two most expensive bikes in the test field, the Specialized S-Works Turbo Levo and Specialized S-Works Turbo Kenevo SL, cost 15,000 each. The Norco Sight VLT C1 and Rocky Mountain Altitude Powerplay C70 have some catching up to do. Price: $8999.00. Cable management is nice and tight, though the external wiring at the handlebar and along the non-driveside chainstay isnt as tidy as some other bikes on the market. That is, until you ride them. Press Fit BB. What makes a good eMTB and what should I look for in an eMTB? That bike has a remarkable ability to insulate your feet from whats going on underneath the wheels, leading to a cloud-like ride quality. Tires are elementary. That is very quick, resulting in a higher average climbing speed overall. It inspires a load of confidence on technical descents, with the suspension gobbling up rocks and big hits with ease. 2023 Thok TK01 R Review | A surprising package from an Italian e-MTB specialist, Trek Rail Review | A plush, powerful & frustratingly near-perfect electric mountain bike, 9 tuning tips to get the most out of your Bosch electric mountain bike | Bosch Smart System Review, 4 upgrades & 7 updates on our Fuel EXe long-term test bike | Trek Fuel EXe Review, This website requires Javascript for optimum viewing purposes. The perceived noise depends strongly on the resonance of the frame and varies from bike to bike. An eMTB is more than the sum of its parts and the arms race for metrics like battery size, motor power or suspension travel rarely produces better bikes. How long are your longest rides and how much ascending do you realistically do? A practical side effect is that these bikes can be placed upside down, which is particularly important for models where the battery is removed from the down tube. The perfect suspension offers safety, reserves, comfort, control and enough feedback from the ground to actively manouevre the bike across the trail. Rocky Mountain, Shimano and Specialized use a minimalist handlebar remote to ensure that you always hit the right button in the heat of battle. The future of eMTBs doesnt just look promising, it also looks versatile. For us, stone-baked pizza, a fresh ocean breeze and good espresso are just as much part of a successful day on the bike as flow on varied singletrack, the occasional adrenaline spike and high-fives at the end of the trail. Theres a heap of adjustability on offer, and once I found my sweet spot I was rewarded with a comfortable riding position and exceptional weight distribution that made the Altitude Powerplay both agile and predictable across a wide range of conditions. The Jumbotron display is fantastic, providing the rider with just enough useful information in a clear and easy to understand manner. Pedal strikes also became an issue, as the BB ends up being quite low in that slack setting. Price: $5,299 List Pros: Smooth and consistent power output, modern geometry, Cons: No digital display, wimpy tires and fork, center of gravity feels high. )! MSRP: $6,500; MODEL YEAR: 2023; Read Review. Specialized Turbo Tero X 6.0 . We are looking for the best all-rounder that can take on any trail! However, to integrate the long battery in the down tube, a cutout over half a metre longer is necessary. With so many different tire manufacturers and special models on the market, its hard for even well-versed tech nerds to keep track of everything. Just because you have the range doesnt mean youll have fun riding! the best eMTB of 2021, the MERIDA eONE-SIXTY 10K, went into this test almost unchanged and demonstrated that it is still a strong all-rounder. More battery capacity automatically means more weight and, due to the larger dimensions, usually a position that worsens the weight distribution, leading to compromises in handling. . Partway through a ride I flipped the dropout chip into the long setting, which took all of about five minutes. There have been some small rolling changes to the Altitude Powerplay in that time, but the 2022 model sees the platforms biggest overhaul yet with an entirely new chassis, an updated motor, bigger battery and a refined user interface. Welcome! Add to Basket. With the Shimano EP8 motor, you can even save two different profiles so that you can quickly switch between your configurations. The pedalling position on the Rocky Mountain Altitude Powerplay Carbon 90 Rally Edition is comfortable, making it ideal for longer outings. How did we test the bikes? . However, you dont have a free choice with every manufacturer. ROCKY MOUNTAIN INSTINCT POWERPLAY CARBON 70 Travel: 140mm Motor: Dyname 3.0 Battery: Fully Integrated Li-Ion, 672Wh MSRP: $7,999 READ THE REVIEW SPECIALIZED TURBO LEVO EXPERT Travel: 150mm Motor: Specialized 2.1 Battery: Turbo M2-700, 700Wh MSRP: $8,250 READ THE REVIEW TREK RAIL 9.9 Travel: 150mm Motor: Bosch Performance CX The higher the ratings on the scales at the end of each review, the better the bike is in these areas. It is fun to ride on flow trails and the suspension and high touring comfort are also a strength. For increased sensitivity, the lower shock pivot rolls on dual bearings rather than a conventional bushing. The change made an immediate improvement to weight distribution, improving stability on the descents and offering balanced grip between the front and rear wheels. Price plays a subordinate role because, understandably, manufacturers debut the most exciting technologies and concepts in their flagship models. The motor is called Dyname 4.0, and like the frame its had a significant update for 2022. And Mom wouldnt be able to save you. By Jeremy Benson, Joshua Hutchens, Chris McNamara Jun . With four assist modes on offer, the performance band of the Rocky Mountain Altitude Powerplay spans a pretty wide gap. Despite the ratings, the review itself is crucial, because thats where we explain the bikes character traits in detail and give you a deeper understanding of the sum of the bikes parts. Its possible to reduce the leg effort required to bring on the motors power via the Boost setting. 2-Bolt ISCG05 Tabs. Class 3 electric bikes integrate a motor that activates only when the rider is pedaling and top out at 28mph (and feature a speedometer). Here well be diving into our experience of testing the second-from-the-top model; the Rocky Mountain Altitude Powerplay C70. For this, eMTBs should have four-piston brakes with discs of at least 200 mm. And is range really that important to you, or would you rather have good handling on the trail? Then again, Mick found the novelty of all those features quickly wore off during his long-term test of the Levo. At the start of the new season, we test the highlight bikes of the new season to find the best eMTB of the year. Every bike from size L upwards should have space for at least 170 mm. *with range extender During the first few rides, the Rocky Mountain Altitude Powerplay didnt quite feel as stable as I was expecting for a big travel e-MTB. Rock gardens, roots, jumps, berms, open corners and high-speed berms we had everything we needed to test the bikes capabilities in different situations. Altitude Powerplay Alloy 30 Coil New Color $6,199.00 USD Altitude Powerplay Alloy 50 New Color While the ride height was good, and the suspension felt pretty plush, I did find there to be a lack of sensitivity deeper into the travel. Wir haben uns einen berblick ber die Fully E-MTBs 2019 verschaft und stellen euch die Rder vor die es in unsere Top 10 geschafft haben. It is the perfect all-rounder that covers the whole spectrum from touring to bike park visits, scores with enormous riding performance and convinces with almost perfect and sensible equipment, even if it comes at a hefty price of 13,790. Impossible? Despite its ability to mob through straight-line chunder, it rips turns with surprising nimbleness that had me constantly grinning from ear-to-ear. This isnt possible with the MERIDA, SCOTT and ROTWILD. However, the suspension generates loads of grip, and combined with the robust tyres and well-balanced weight distribution, it absolutely rips through the corners. Become a supporter now! These New Bikes Prove Electric Need Not Be Ugly, There's Nothing Else Like this $2,000 Gravel Bike, The Best Bike Pumps for Every Type of Rider, This Throwback MTB Punches Well Above Its Weight, The Tiny Earbuds Are the Future of Wireless Hi-Fi, The Last-Chance Presidents' Day Furniture Sales, You've Never Heard of 2022's Most-Awarded Whiskey. This allows riders to tweak the BB height by up to 10mm, and adjust the angles by 0.8. Even still, the Altitude Powerplay doesnt ride like a chopper, with a fairly moderate 625mm stack height. But is more always better? Rocky Mountain's more aggressive and longer travel version of the Instinct Powerplay is designed for riders who want just more travel for a more aggressive riding style. However, its important not to confuse price with the real value i.e. With its sophisticated modular battery concept with a 360 Wh battery and 252 Wh range extender and throttled, 60 Nm Shimano motor, combined with an individual look, almost perfect spec and outstanding riding performance, the Spanish trail rocket convinces across the board. This is in contrast to the latest Bosch motor, which continues to deliver power for a little longer if you take a brief pause on the pedals, helping to push you up and over a big root or rock slab. There are five options in total in the 2022 Rocky Mountain Altitude Powerplay lineup, three of which feature carbon frames and two that use alloy frames. Only knock? Most eMTB hardtails simply arent made for the trails! After all, body size is usually also related to body weight. Exceptions are last years test winners and best buys. As for rebound damping, I set both the adjusters on fork and shock a click or two slower than halfway. Specialized e-MTBs tend to be very good at converting uneven pedalling inputs into a very smooth and linear motor output. While Ive found the long chainstay setting to work beautifully for my height and riding style, I do wonder how taller riders on the Large and XL frame sizes will find the rear centre length. The problem: if you exceed the maximum permissible weight, this can have consequences for warranty and guarantee claims. Anything else would be misleading and besides being unfair to some brands, we would be patronising our readers. - Controller buttons are too light and vague in use The bike has an aggressive geometry best for more advanced riders, which allows it to stay nimble despite weighing 51 pounds. Though it's a bit heavier than some others at 52 pounds, the Moterra Neo Carbon 2 is more than capable of tackling all manner of terrain. However, if youve miss-timed a shift and find yourself tackling a steep incline in a higher gear than optimal, the motor still manages to produce decent grunt at lower RPMs, not unlike a Bosch motor. Rocky Mountain 2022 Instinct Alloy 30 29" MTB Gold/Red. Rotwild could tease out much more trail performance with different choices. Rocky Mountain have opted for a 48V platform for their batteries (most manufacturers run 36V) This is especially important for Australia. The powerful and adaptable Dyname 4.0 motor is ready to go when you are, surging forward with 108 Nm of torque the. Rocky Mountain carbon 70 vs specialized enduro comp. Find out everything you need to know in our motor group test. With one exception (Orbea), the bike manufacturers in this test see it the same way. Rocky Mountain Altitude Powerplay Carbon 70. Even in the long position, the Altitude Powerplay is still agile for a big rig. Related Articles First impressions - The Ibis Oso Ride Review. Thanks to the small internal 360 Wh battery and the additional 252 Wh range extender, which is placed into the bottle cage, weight remains centrally positioned even with a total 612 Wh capacity. Unfortunately, far too many people are still blinded by individual components that look good on the shop floor. There are opposing schools of thought when it comes to which is preferable, but in the end it all comes down to weight distribution and what's more comfortable for the rider. - 8-way adjustable geometry So, the key questions we asked ourselves in this group test were: what type of rider will love this bike? The YT DECOY MX CORE 4 is equipped with the Shimano EP8 motor in combination with the small 540 Wh battery, which was introduced at the beginning of 2019. The bigger the disc, the better the control, the better the modulation on long descents and the better the resistance to fade. Theres nothing but thumbs up for the tyre spec, especially the choice of a 3C MaxxGrip compound up front. With availability limited and eMTBs a big investment for many, its especially important to know about the latest technologies and the huge differences between models before buying one. Dry, boring, complicated: numbers have a bad reputation. We dont re-invite such bikes every time. The 750 Wh battery can be removed to the side in typical Trek fashion. Unfortunately it doesnt have a clock a simple but much appreciated feature that we love about the MasterMind TCU display on the new Levo. The Orbea Rise shows how its done! Out of the box, one of the more obvious differences between the Dyname 4.0 motor and its big-name competitors is the fact that it requires more input from the rider. Here are the tops, flops, winners, losers and further recommendations. The suspension consists of a FOX 38 Factory GRIP2 fork and FOX FLOAT X2 Factory shock, controlling 170/160 mm travel at the front and rear. They may have changed since then. Charging times will vary by bike model (and whether you're using a portable power bank or plugging directly into the wall), but the average charge time for an electric mountain bike is anywhere between 8-12 hours. It's perfect for hyper-aggressive riders who want to ride the hardest trails without a chairlift or truck shuttle. In this group test, were not just looking for the best eMTB of 2022. Maybe weve tested it previously, maybe an exciting successor will be introduced this year, or maybe it will soon be available again and end up in one of our next tests. This is because the guts of the Dyname 4.0 are spinning at a lower RPM, producing a lower pitch and generally less volume overall. Manufacturer: Rocky Mountain. eBay Kleinanzeigen: E Mtb E Bike, Fahrrder & Zubehr - Jetzt in Halblech finden oder inserieren! But FOCUS, MERIDA and Orbea also offer a considerable margin with 124 kg and 117 kg respectively. The excellent tyre spec and mid-high suspension design generates masses of grip, allowing the Altitude Powerplay to claw up rough and loose technical climbs with stability and quickness. Like the longer travel Altitude, it gets the new motor and Ride-4 chip. The bikes with 700+ Wh batteries in this group test all have the same problem: the longer and heavier batteries have a negative impact on handling. After tweaking the air volume in the fork and shock to improve traction and high-speed control, I decided to try out a variety of the Ride-4 geometry settings. We believe that every rider has different needs and preferences, and its up to you to find out what these are and then choose a bike based on that. Afterwards, youll not just be well equipped for buying an ebike or have even found your dream match, youll also have gathered numerous insights and expert knowledge indispensable for trail talk, the pub and forum discussions! Pretty damn good at just about everything climbing, descending, cornering and going strong all day the new Spectral: ON CF 7 is for those who will ride nearly anything. We start with the FOCUS JAM2 7.0 for 7,799. However, all this wont do you much good if you dont have the right tyre pressure. the 3C MaxxTerra rubber compound from MAXXIS or ADDIX Soft (orange) from Schwalbe. And again, the all important battery life. The motor anchors above and forward of the crankset, with a small drive sprocket that sitsclose to the main pivot. Particularly on the front, better traction outweighs minimally higher rolling resistance. In comparison, theres a little more pulsing from the Dyname 4.0 motor if youre stabbing at the pedals, and it can be slightly jerky when youre hovering around the 25km/h cutoff point. As a result, an arms race for larger batteries has been taking place for years. Our reader survey showed that three brands are particularly interesting and important to you: Specialized, Haibike and CUBE. A Light eMTB downhill with the climbing characteristics of an all-round eMTB uphill? While it has a specific use in mind with its unique character, it does what it is aimed at well. In fact, the 437mm rear centre length is identical between the two bikes, and should be noted as being incredibly short for an e-MTB with 29in wheels and 160mm of rear travel. And no matter where you take it, its an incredibly fun ride. They have a maximum load of just 94 kg and 95 kg respectively. To put it through its paces, Ive taken the Altitude on chunky off-piste singletrack, swoopy flow trails and big alpine point-to-point rides. You can find out how to figure it out here. The cheapest bike in the test field, the SCOTT Ransom eRIDE 910, costs 7,199 and enters the race as the reigning Best Buy from last year. SPECS ROCKY MOUNTAIN ALTITUDE POWERPLAY CARBON 70 MSRP: $7400, 6000 Motor: Rocky Mountain proprietary Battery: 48V/1,632 Wh Charge time: 4 hours (80% in 2 hours) Top speed: 15.5 mph/25 km/h (with assist) Range: 25-45 miles (40-70 km) Drive: SRAM EX1 Brakes: SRAM Guide RE, 200mm front/rear Controls: Rocky Mountain proprietary, plus Ebikemotion app The SCOR 4060 Z ST XT impresses with its touring capabilities, the customisable paint protection films and the fun ride on flow trails. On the front wheel we recommend a robust casing for puncture protection in combination with the softest rubber compound for more grip. As you can see, tires are a complex issue. It doesnt offer the same amount of overrun as a Bosch motor for conquering ledgy moto-style climbs, and I suspect that taller riders may also wish for a steeper seat angle and longer rear end. Full Sealed Cartridge Bearings. Compare. Rocky Mountain Altitude Powerplay C70 2023 Cycle in Surgery EMTB - Rochedale South Enquire Now Enquire Now AU$9,999 Rocky Mountain Instinct PP A50 Kew Bikes - Kew FREE shipping within Australia * AU$9,999 Rocky Mountain Instinct Powerplay Alloy 50 (Blue/Grey) 2022 - Now Available! Weighing in under 42 pounds (the lightest on this list) and offering a 40-mile range, the Levo SL is a true unicorn. Its not the poppiest bike given its mass and suspension platform, though riders concerned by weight may wish to look towards the slightly shorter travel Instinct Powerplay. To answer this question, we pitted 13 exciting models against each other. This involves pedalling up a road climb with the motor set to the most powerful assistance level, before bombing back down along a variety of downhill runs to see how many laps I can get in until the battery runs flat. It not only covers a huge range of application but was also the strongest competitor to the test winner, the YETI 160E T1. That is A LOT of power, but Rocky has worked hard to make the motors output as directly proportional to rider input as possible, so its more like a dimmer switch than an on/off button. Although you dont necessarily need the biggest disc rotors as a 70 kg flyweight, you will still benefit from them. But is different any better? In this guide, we break down what restrictions still apply to e-MTBs, what to look for and who should buy one. Weve summarised what this can cost per year and what you need to bear in mind. Compared to the previous model, the new Altitude Powerplay updates to a trendy mid-high pivot suspension design, with the main pivot sitting 100mm north of the BB. Which of these would perform better for Mostly scetchy jump trail as well as a pump track with a steep fire road climb. From Light eMTBs with limited motor support to powerhouses with plenty of grunt, everything was represented. Indeed cornering is unquestionablyone of this bikes strongest suits, and it manages to achieve that without a 27.5in rear wheel. Ride stats from RM Altitude from Strava, Garmin and Ebikemotion app: Moving time 1h 9m, distance 10.4 miles, elevation gain 2,091 ft., estimated average power 155w, energy output 647 kJ. Riding your bike to the park rather than throwing it on a rack is actually feasible. Sadly, on the Rocky Mountain, the battery rattles. I ended up doing the same thing with the fork too. The other has the new Smart System 2022, which is also based on the Bosch Performance Line CX motor. Rocky Mountain 2022 Slayer Alloy 30 27.5" MTB Gold/Green. To manage that sensitivity, the new motor features a revamped torque curve that gradually applies power up to a maximum output of 770W. But beware: on some bikes, the display can also be in the way. Either way, its clear this is a bike that is capable of racking up some seriously big rides. As you can see, just an annual inspection isnt enough. Thats why in our group tests we look at the value of the overall package and focus on the overall performance, not individual components. With a smooth ride and easy handling, it is suitable for beginners as well as high-speed junkies. Firstly, big kudos to Rocky Mountain for providing a masterfully detailed online manual for the Altitude and Instinct Powerplay models, which contains lots of useful information on setup, including baseline shock pressures and damper settings. Testing the Rocky Mountain Altitude Powerplay has been quite the journey of discovery. For anything more, you can find all the details on the best tires for eMTBers in our tire group test of over 50 tires. Unfortunately, the range of functions is significantly limited compared to Shimano and Specialized, and the added value is low. The best eMTBs are able to combine seemingly contradictory characteristics, like being agile yet composed. Thats on the heavy side even for a big travel e-MTB, though theres certainly nothing dainty about this bike. For years, pedal-assists were forbidden from trails, non-existent in shops, shunned from mainstream media and magnets for vitriol. And while the overall integration is neat and the controls on the Altitude Powerplay are a vast improvement over the previous model, the main buttons on the remote switch are too light and a bit vague. time stamps 0:00 intro 2:48 mid travel full power e bikes 3:27 mondraker crafty 4:08 rocky mountain altitude powerplay 5:06 trek . Dankzij zijn planetaire mechanische tandwieloverbrenging benadert de magneet de reis 3 . Remember the summer your little brother grew six inches and, for the first time, forced you to yell uncle when wrestling in the basement? Many other brands could do well to take note. Suspension-wise I didnt find the Rocky Mountain Altitude Powerplay to be as gooey-plush as the Specialized Kenevo SL, which is my personal benchmark out of all the big travel e-MTBs weve tested. Do you run out of juice? We also provide a lot of specialist knowledge, behind the scenes information and a report on the hottest trends all of this is wrapped in a high quality print format. Tailles dispo. Last years test winner i.e. Is Veja's Foray Into Hiking Shoes a Hit or Miss? Allow me to jog your memory. Nope, I want my cake and I want to eat it too. One of the most. Your personal setup and the factory settings of the suspension fork and shock from the bike manufacturer also play a major role. There are sliding scales at the end of each review, giving you a visual representation of the bikes handling. These lighter inserts arent necessarily employed for hardcore rim protection, but rather to lock the tyre beads in place to prevent burping.