Indoor Cycling

Reliable. Durable. Quieter Than Ever Before. When it comes to indoor bike trainers, the most frequently asked question is: how quiet is it? Taking this to heart, our Madison, Wisconsin-based team put this query under the microscope and set a goal to build a trainer so quiet, that the only sound is that of your drive train. The result? A direct drive smart trainer that touts a sound specification of 59 decibels at 20 mph. In other words, the H3 is five times quieter than previous generations, making it the quietest smart trainer to ever leave our doors. Following the Saris direct drive smart trainer legacy, the H3 features the same reliably and durability as its predecessors. Each H3 is made from cast and machined aluminum sourced from America’s heartland. Encased inside are components meticulously calibrated to measure power, speed and cadence, as well as a precision-balanced flywheel - all built to handle 2000 watts and replicate a 20% climbing grade. Tested to withstand heavy training, the H3’s internal cooling system will keep the electromagnetic resistance system working – and accurate – long after your legs have given out. - Quieter Than Ever: all new drive system shaves decibels off previous generations. - Precise Training: +/- 2% power accuracy. - Controlled and Consistent: electromagnetic resistance provides a measured workout every time. - Direct Drive Design: widest bike compatibility and eliminates wheel slips. - No External Sensors Required: measures speed, cadence and power. - Seamless Integration: connects to indoor cycling apps with dual ANT+ FE-C and Bluetooth FTMS standards. - Zwift certified. Specs - Noise level: 59 decibels at 20 mph - Power measurement accuracy: +/- 2% - Maximum power output: 2000 watts at 20 mph - Simulates a 20% climbing grade - Fast response electromagnetic resistance - Measures speed, cadence and power – no external sensors needed - 20 lb precision balanced flywheel - Integrated dual ANT+ FE-C and Bluetooth FTMS standards - Built-in front wheel block - Integrated carrying handle - Compatible with Shimano 8-11 speed cassettes - XD/XDR freehubs sold separately (link) - Thru-axle compatible for bike frames with fork widths of 142 or 148. - Quick-release compatible for bike frames with fork widths of 130mm and 135 mm. - Compatible with a wide variety of devices and indoor cycling applications, including Rouvy, Zwift, TrainerRoad and many more. Contact us with questions about compatibility with other software. - Headless mode (powered on, not paired to any apps) lets you ride with a progressive resistance curve that matches the Fluid2 (link). - LED indicator lights communicate connectivity and more. - Direct drive design directly connects the bicycle to the resistance unit, eliminating tire wear. - Internal cooling technology ensures accurate ride data even during the hardest of workouts. - Folding legs provide widest footprint of direct drive indoor bicycle trainers on the market for added stability and easy storage. - Accessible and balanced handle allows for smooth, anyone-can-carry transit of the trainer. - Over the air (OTA) firmware updates and calibration via the Saris app (link to firmware page) - Maximum weight (rider and bike): 300 lbs. - Dimensions when Open L*H*W: 31x18.5x19.5 inches (787.4x469.9x495.3 mm). - Dimensions when Closed L*H*W: 8.5x18.5x19.5 inches (76.2x469.9x495.3 mm). - Weight: 47 lb. (21.3 kg). - Cassette sold separately.

No matter how busy you are, hop on Sunlite's F-5 Training Cycle and get a workout regardless of the weather outside. The fully adjustable design means you get a perfect seating position so you can perform at your peak, and the heavy-duty frame keeps flex to a minimum for awesome power transfer. Adjustable resistance allows you to tailor your workout, too, and the side-braking resistance design translates into longer bearing life. You can even track your time, speed, distance, calories, and total distance on the built-in computer. And when it's time to tuck the F-5 away, oversize wheels help you roll it across hardwood floors and even carpet.

The Wahoo KICKR SNAP makes indoor training a "snap!" It's a convenient, easy to set-up wheel-on smart trainer with the realistic ride experience Wahoo smart trainers are known for. The SNAP's legendary flywheel features technology that creates the same resistance experienced when riding outdoors. Plus, no other indoor bike trainer has more software training options, including Zwift and Trainer Road. The KICKR SNAP includes LED lights for connection status, third party power meter support, and the power measurement is now accurate up to +/-3%. - Designed for consistent power measurement of up to 1500W and accuracy of +/- 3% so that you can monitor and adjust your intensity. - Visual confirmation that KICKR SNAP is powered, connected and transmitting via Bluetooth Smart and/or ANT+ - Wahoo's KICKR CLIMB indoor grade simulator was designed in conjunction with the KICKR smart trainers to deliver an unmatched indoor training experience when combined. - KICKR HEADWIND was designed to deliver innovative climate control to your indoor training experience. - ANT+ and Bluetooth capabilities allow it to connect to both smartphones and GPS devices simultaneously or separately. An ANT+ FE-C connection allows the KICKR to be controlled from any FE-C enabled device or application. - SNAP's wheel-on design makes it easy to turn your road, mountain, or TT bike into a powerful indoor smart trainer. - Made from high strength carbon steel and featuring a wide stance, SNAP is designed to keep its feet firmly planted on the floor and your bike securely locked in so you can train with confidence. - When connected to your device, it automatically sets your resistance via your favorite app or software - The SNAP flywheel is innovative and proven technology emulates the power and inertia experienced during outdoor riding. It provides the most realistic ride feel especially when using virtual riding/training platforms like Zwift and Trainer Road. - Get vital cycling metrics on your indoor ride. - Low operating sound, so no shouting required! - Works with popular training apps such as Zwift, The Sufferfest, Fulgaz and TrainerRoad. - Compatible with a third party power meter.

Looking for a smart, direct-drive trainer? The FLUX S Smart checks all the boxes: it’s reliable, accurate, silent, strong, and features a heavy flywheel for a very realistic ride feel. Made to help you sweat while cycling with your favorite apps, this bike trainer is the ideal indoor training companion. - Measure your power within 3% error tolerance - Next-to-silent direct drive trainer lets you ride without disturbing others - Works with popular third-party training apps such as Zwift and Tacx - Train with realistically simulated inclines up to a 10% gradient and a max sprint resistance of 1,500 watts - Sturdy design easily allows for riding full-out and standing on the pedals FEATURES Type of trainer: Interactive Smart direct drive with electric brake Magnets: 8 Permanent ferrite magnets & 8 electromagnets Transmission: None Electrical requirements: 110-240 Volt Power indicator: None Connection indicator (ANT/BT): 2 LEDs Firmware upgradable: Yes Suitable cassettes: Shimano & SRAM: 8 - 11 speed, Campagnolo. Not suitable for Specialized SCS system, SRAM XD and XD-R body sold separately Suitable axles: Road 130mm, MTB 135mm, 142mm & 148mm thru-axles. Adapter for 135 x 10mm available. Suitable bikes: Race, Tri, & MTB Supplied with: Quick release for road bikes and mountain bikes (5mm), Direct-drive quick release with adapter set for 142x12mm & 148x12mm thru-axles, 1 month Tacx Premium software SPECIFICATIONS Max. power (40 km/h): 1500 Watt Max. incline: 10% Simulation of descent: No Max. torque: 22.1 Nm Max. brake force: 65 N Flywheel: 7kg Mass inertia: 22.8kg (50.3 lbs) Calibration: Spin down Footprint (lxw): 670 x 642 mm (26.4 x 25.3 in) Height: 460mm (18.1 in) Weight: 22.8kg (50.3lbs) Article number: T2900S DATA OUTPUT AND CONTROL Wireless communication: ANT+ FE-C, Bluetooth Smart open Control by: ANT+FE-C bike computers, Connect to computer via ANT+antenna, Smartphone, Tablet, Stand alone Output: Cadence, Power, Speed Read out on: Bike computer, Computer with ANT+ antenna, Smartphone, Sports watch, Tablet Error Tolerance: <3%

No fancy gizmos. No wires. No fuss. If you’re looking for an easy way to ride your bicycle indoors, call off the search – you’ve found it. Whether your training for a local charity ride or working to beat your friend’s FitBit score, the Mag indoor bike trainer can help you make it happen. Simply connect the trainer to the rear wheel of your bike, hop on, and pedal away. Plus, the Mag comes with five adjustable levels of resistance so you can adapt every ride to your liking. - Magnetic resistance unit provides a quiet and frictionless ride. - Linear resistance boosts workout intensity to match each pedal stroke and gear click. - Features five adjustable levels of resistance - Compatible with Zwift and other indoor training apps

For a stable, worry-free ride with any rear wheel-mounted trainer. Product Features - For a stable, worry-free ride with any rear wheel-mounted trainer. - Unique 3-level design lets you select the level of difficulty. - Stack two blocks to simulate climbing workouts. Three different positions to raise your front wheel and simulate hill climbs - 2.1 inches (5.3 cm) - 2.7 inches (6.8 cm) - 3.1 inches (7.9 cm)

The E-Thru Trainer Axle allows the use of a mountain bike in a Tacx trainer. These axles are only suitable for Tacx classic trainers.

- Replacement belt - Select model based on model/roller size and belt size

- Includes clutch knob and L-bolt - Basic Trainer Clutch Knob is compatible with any Wind, Mag, Mag+, Magneto or Fluid trainer that already uses L-bolt - Magnus Clutch Knob should only be used with Magnus Smart Trainer - Watch our video to learn more

Adjust resistance on Mag trainer without leaving the saddle. - Quick Release mounting system fits most stems. - For use with the Mag bike trainer only

SportCrafters trike trainers are the only trainers in the world specifically designed for recumbent trikes. Easy to use, lightweight and portable, they do not require any assembly or maintenance. The OverDrive Trike Trainer, powered by ARC Technology, automatically adjusts resistance as the rider changes speed – no manual adjustment necessary. At higher speeds, the OverDrive Trike Trainer will ramp up the resistance to realistically mimic road riding conditions. For a lighter workout, just turn the trainer around and it automatically functions with low to moderate resistance. So many customers asked for more resistance from the OverDrive trike trainer that we now offer the Double OverDrive trike trainer with two identical progressive resistance drums. At higher speeds, the Double OverDrive Trike Trainer will ramp up to the highest resistance you can get to achieve a GREAT workout! For an easier workout, just turn the trainer around and it provides low to moderate resistance.

A sweat cover with a pocket for your smartphone. The sweat cover protects your bike against perspiration and enables the use of a phone while training. The Tacx sweat cover is made from absorbent textile to catch and retain perspiration. Its clever design fits all bikes and enables easy mounting. Suitable for a variety of phone sizes - max. length 138mm, max. width 68mm.

Save Your Tires for Race Day Frequent trainer riders often find the tread on their rear wheel will wear down over time. We recommend using our trainer tires on our Saris indoor trainers. They are made of tough material that can stand up to hours and hours and hours of training. Product Features - 700c x 23 – 25 fits most road bikes. - Ultra-quiet and super-durable. - For use with an indoor trainer only.

Keep your handlebar organized and your devices secure with the LW-STD (22.2/25.4/28.6mm) from Minoura. - Alloy clamp for mounting your own device on handlebar or stem - Lightweight and rustproof aluminum construction - Hex wrench required for instillation and removal - Clamp body has (1) M5 Thread hold in center - 22.2 mm-28.6 mm diameter range

A Killer Training Combo What happens when you pair a speed sensor with the #1 selling bike trainer in the USA? You get a combo that’s ready for any virtual—or non-virtual—training ride. It’s the ideal setup for budget-conscious athletes looking to join fun, virtual communities, like Rouvy and Zwift, without a traditional smart trainer. Simply install the magnetless speed sensor on the rear wheel of your bike, mount your bike to the solid Fluid2 trainer with our innovative club knob, connect to your virtual training app of choice via Bluetooth or ANT+, and voilà! - you’re ready to sweat. Product Features - Fluid resistance unit provides a quiet and consistent ride. - Progressive resistance offers the widest resistance range and road-like feel. - Included speed sensor connects you with Rouvy, Zwift and other indoor cycling apps. - ANT+ USB and BlueGiga USB sold separately. - Includes one month subscription to Rouvy virtual training app In the box: - Fluid² Smart Equipped Bike Trainer - Dual-band magnetless speed sensor - Fluid² is the best-selling trainer in the USA. - Fluid resistance unit creates optimal road-like feel. - Fluid resistance unit provides a quiet and consistent ride. - Noise level at 20 mph is super quiet 64-68 decibels. - Large, individually precision-balanced flywheel allows for improved road-like feel. - Self-cooling mechanisms including a patented fan design keeps the unit performing better, longer. - Eccentric leveling feet allow for easy adjustment on uneven surfaces. - Comes on the foldable Classic frame with spring loaded, bolt-action lever. - Precision-machined alloy roller reduces tire wear and slippage. - Features clutch knob for perfect roller-to-tire tension each ride. - 2" resistance unit roller allows for 650b, 700c, 26", 27" and 29" wheel sizes – up to a 2.0 tire. - This trainer is designed to fit common road and mountain bike frames with included steel quick release skewer and has three settings for rear dropout spacing: 120mm, 130mm and 135mm. - Trainer tire recommended. - Compatible with indoor cycling apps. - Trainer is tested to the combined weight (rider and bike) of 300 lbs. - Optional thru-axle adapter available for 142x12mm and 148x12mm bikes. - ANT+ USB and BlueGiga USB sold separately. - Formerly branded as CycleOps Fluid² Smart Equipped

Our Trainer Axle is designed to adapt your thru-axle equipped bike to on-wheel trainers, such as a 1up, Blackburn, Cyclops, Kinetic, Tacx, Wahoo, and many others. Our goal is to fit the thru-axle to your bike perfectly to minimize spacers and extra parts, providing a clean, high-performance axle for your bike. Train, warm up, and be race ready and fit for the season. - When it’s time for your race or time to head outside, simply remove your bike from the trainer, remove the drive side axle end and go. Our axle is suitable for use on or off the trainer, indoors or out. - The axle shaft and axle ends are precision CNC-machined from 7075 aluminum and hard-anodized for rugged durability. - No special tools required. Design allows for installation or wheel removal using your standard 5mm hex wrench. - Designed, built, and quality tested in the USA. Proven around the world. Important: Before you order, make sure your specific trainer will accommodate the width of your modern thru-axle-equipped bike. Measure your trainer at the widest setting and measure the outside width of your bike frame. Our the trainer axle ends will extend past your frame on each side.

CycleOps' Sweat Guard is a valuable accessory for any trainer. It keeps corrosive sweat from harming your bike and home. It's made from soft, absorbent, washable terry cloth and is attached with elastic and Velcro straps. Two front pockets keep the remote, phone, or food close by while you're hammering away.

Whether you want to attend a group ride in Zwift, climb the Dolomites in Rouvy, or simply need a sweat session, the M2 smart trainer can get you there. All you need is your bike, the M2, your favorite virtual training software, and device of choice. This do-it-all, smart bike trainer is capable of replicating any workout thrown its way, up to 1500 watts and a 15% climbing grade. Simply connect to your virtual training application of choice via integrated dual-band ANT+ FE-C and Bluetooth, and let the M2’s electromagnetic response system do the rest. And, thanks to integrated speed, cadence, and power data, you can track and record performance data without extra external sensors. Plus, our innovative clutch knob ensures perfect tire-to roller connection for every single ride. - Noise level is a quiet 69 decibels at 20 mph. - PowerTuned using PowerTap technology for accurate power readings up to +/- 5%. - This trainer is designed to fit common road and mountain bike frames with included steel quick release skewer and has three settings for rear dropout spacing: 120mm, 130mm, and 135mm. - Optional thru-axle adapter available for 142x12mm and 148x12mm. - Integrated dual ANT+ FE-C and Bluetooth standards. - Fast response electromagnetic resistance ensures most responsive resistance and maximum power available. - Robust design is capable of handling up to 1500 watts at 20 mph and can simulate up to a 15% climbing grade. - Headless mode (powered on, not paired to any apps) lets you ride with a progressive resistance curve that matches the Fluid2. - Internally integrated speed, cadence, and power data eliminates the need for extra external sensors. - LED indicator lights communicate connectivity and more. - Internal cooling system moves air through the trainer to keep it cool while active thermal sensors ensure accurate performance data even during the hardest of workouts. - Comes on the Saris foldable Classic frame with spring loaded, bolt-action lever. - Features clutch knob for perfect roller to tire tension each ride. - 2" resistance unit roller allows for 650b, 700c, 26", 27", and 29" - up to a 2.0-inch tire. - Does not fit 650c wheel sizes, nor all 29er tires. - Precision-machined alloy roller reduces tire wear and slippage. - Eccentric leveling feet allow for easy adjustment on uneven surfaces. - Trainer tire recommended - Compatible with a wide variety of devices and virtual training applications, including Rouvy, Zwift, TrainerRoad, and many more. Contact us with questions about compatibility with other software. - Over the air (OTA) firmware updates via Bluetooth devices ensures the M2 is up to date. - Some assembly required - All of our trainers are tested to the combined weight (rider and bike) of 300 lbs. - ANT+ and BlueGiga USB dongles sold separately - Not compatible with CycleOps- or Saris-branded 20/24" wheel adapter

The latest innovation from Wahoo will literally take your indoor training to the next level! KICKR CLIMB indoor grade simulator is designed to work exclusively with the Wahoo KICKR Smart Trainers and when paired, it will add physical grade changes to your indoor training. The KICKR CLIMB is compatible with Third Party Apps, so whether riding a virtual course or performing a structured workout, KICKR CLIMB blends ascents and descents with resistance changes for a truly immersive indoor training experience. The world isn’t flat; now, neither is your ride! Features - Real-time grade changes - App controlled - 20% maximum incline - -10% maximum decline - KICKR smart trainer compatible - KICKR desk compatible - Wahoo ELEMNT bike computer compatible - Direct proximity pairing - Locked and unlocked climbing modes - Manual grade adjustments with remote control - Quick release and thru-axle bike compatibility - LED indicator lights - Professional grade durability - Third party app compatibility

Take your ride inside with Tacx Boost. You won't need external power to use this trainer, thanks to a forceful magnetic brake that allows you to directly apply resistance or lighten it. Resistance can be controlled with a lever on the handlebar. The setup is easy—with just two simple clicks you mount your bike and you are ready to ride. SIMPLE SETUP With just two simple clicks, you'll be ready to ride. SMALL BUT STABLE This indoor trainer has a small footprint, 675 x 650 mm (26.6" x 25.6"), but provides a sturdy ride. EASY TO STORE Multifunctional front wheel support serves as a handle to carry the trainer and ensures a natural cycling position. MAGNETIC BRAKE You won't need external power to use this trainer, thanks to a forceful magnetic brake that allows you to directly apply resistance or lighten it. RESISTANCE CONTROL A simple lever on your handlebar lets you control the resistance; 10 levels, up to 1,050 watts. REALISTIC RIDE FEEL An actual flywheel generates a realistic and smooth pedal stroke. SMOOTH AND QUIET The closed resistance unit reduces noise and makes for a smoother ride. HOW FAR AND HOW FAST Add a speed sensor (sold separately) to track how far and how fast you're riding and train with some of your favorite apps. FEATURES - Magnets: 2x8 Permanent ferrite magnets - Transmission: Roller, 30 mm - Electrical requirements: No voltage required - Power indicator: None - Connection indicator (ANT/BT): None - Firmware upgradable: No - Suitable bikes: Road, Tri, & MTB with skewer quick release - Supplied with: Front wheel support, quick release for road bikes and mountain bikes (5mm) SPECIFICATIONS - Max. power (40 km/h): 1050 Watt - Simulation of descent: No - Max. torque: 17 Nm - Max. brake force: 50 N - Flywheel: Actual of 1.6 kg - Mass inertia: 9.18 kg (20.2 lbs) - Footprint (LxW): 675 x 650 mm (26.6 x 25.6 in) - Height 410 mm (16.1 in) - Dimensions when folded 565 x 410 x 245 mm (22.2 x 16.1 x 9.65 in) - Weight 8.53 kg (18.8 lbs)

The Saris Leveling Block keeps your bike level with your trainer. - Adds stability to your training ride. - For use with any rear wheel-mounted trainer. - Raises front bicycle tire 1.1 inches (2.8 cm) off the ground

All-in-one H3 package with everything you need to connect to Zwift and Rouvy. Everything You Need to Train Smarter, Harder & Quieter Joining the virtual training world can be overwhelming. That’s why we’ve built this do-it-all package to take all the guesswork so you can simply connect and ride. With this bundle your H3 smart direct drive trainer will come with a pre-installed 11-speed cassette, as well as all the accessories needed to pair to your favorite indoor cycling app. Unsure which app is right for you? We’ve got you covered there too with the included 1-month subscription to Zwift, ROUVY, and TrainerRoad. And when it comes to the trainer itself, the H3 features the same reliability and durability as its predecessors – only quieter. At 20 mph and just 59 decibels, the H3 is five times quieter than previous generations, making it the quietest smart trainer to ever leave our doors. Encased inside are components meticulously calibrated to measure power, speed and cadence, as well as a precision-balanced flywheel - all built to handle 2000 watts and replicate a 20% climbing grade. Tested to withstand heavy training, the H3’s internal cooling system will keep the electromagnetic resistance system working – and accurate – long after your legs have given out. Product Features - All-in-One: includes pre-installed 11-speed cassette, ANT+ USB dongle, USB extension cable, sweat guard and 1-month subscription to Zwift, ROUVY, and TrainerRoad. - Quieter Than Ever: all new drive system shaves decibels off previous generations. - Precise Training: +/- 2% power accuracy. - Controlled and Consistent: electromagnetic resistance provides a measured workout every time. - Direct Drive Design: widest bike compatibility and eliminates wheel slips. - No External Sensors Required: measures speed, cadence and power. - Seamless Integration: connects to indoor cycling apps with dual ANT+ FE-C and Bluetooth FTMS standards. - Zwift certified.

The Giant Indoor Trainer Mat is the perfect noise-reducing floor protection for indoor training. - Rubberized material for easy rinse off after your workout - ‘Pebbled’ surface, anti-skid and scratch-resistant material protects flooring while working out - Extra-large 3’ x 6’ (91.5cm x 183cm) size covers entire workout area, prevents perspiration from getting on carpets or wood floors - Comes rolled-up in draw-string, mesh carry bag with shoulder strap

Keep corrosive sweat from reaching your frame while you're generating heat on your trainer. - Cell phone pouch included

The Skyliner is a front wheel support for use with Tacx classic trainers. It raises and supports the front wheel for a natural cycling position and increased stability. It also serves as a handle to carry the trainer.

Of course you love your Omnium Trainer, but you’re left wondering how you could possibly love indoor cycling training even more. Easy, our non-slip and water-repellent (aka sweat) Floor Mat is designed to keep you safe and protect your floors while in your cycling cleats indoors. And because your cycling training plan asks for incredibly intense efforts, the Floor Mat can ensure firm contact with the ground and prevent movement during leg-busting intervals. Add a Sweat Guard to your indoor cycling collection and you’ve got a training party! - Non-slip surface keep you safe while in cycling cleats - Protects floors from sweat and bike grime - Water-repellent surface does what it was designed to do – keep sweat off your floor - Compress-ability ensures trainer stays put during intense efforts - Easily rolls up for storage - Cleans easily with soap and water - Absorbs noise and vibration - Enhances overall stability of any indoor trainer setup - 4mm (5/32?) thickness is optimal balance of support and storage

The KICKR HEADWIND is the first ever smart fan, designed with the cyclist in mind. Its Targeted Airflow Pattern mirrors the shape and position of a cyclist's body while riding. The KICKR HEADWIND is sensor controlled so as your speed or heart rate increases, so will the fan speed, and there are also 4 manual speed settings should you want to set your own ideal airflow. With speeds of over 30 mph (48 kph), the KICKR HEADWIND will keep you cool during the toughest training sessions. - With wind speeds topping out at over 30 mph the KICKR HEADWIND will keep you cool during your hardest efforts. - The Targeted Airflow Pattern of the KICKR HEADWIND is designed to mirror the shape and position of a cyclist's body while riding on a bicycle. - Control the speed of your KICKR HEADWIND by pairing your ANT+ speed sensor, heart rate monitor, or smart trainer directly to the fan. As your speed or heart rate increases so will the fan speed. - Pair to the Wahoo App via Bluetooth for easy fan speed control at your fingertips. - Control the KICKR HEADWIND with a simple press of a button. Four (4) preprogrammed fan speeds allow you to select your ideal airflow. - The KICKR HEADWIND was specially designed to fit with the KICKR DESK. The wheels on the KICKR HEADWIND allow you to roll the fan into position when it is attached to your KICKR DESK.

The Wahoo KICKR Floormat is the perfect partner for your KICKR. It's water resistant and anti-slip to keep the trainer in place no matter how much you sweat! The thickness and material make it noise insulating, so your family will thank you during those early morning rides. - Impervious to sweat and spilled water bottles. - Gripping texture keeps the KICKR in place, so you can focus on your ride. - Material helps to reduce noise and make the KICKR even quieter. - Beveled edge keeps the mat in line with the floor.

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• Plastic riser block allows the position of front wheel at one of two heights