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 Wahoo RPM speed sensor is the sleek, magnet-less solution for capturing cycling speed data. It easily mounts to your bike's front wheel hub, and the Bluetooth Smart and ANT+ dual band technology allow you to connect to and display data on both smartphones and bike computers. Tracking speed data has never been this easy. - Both ANT+ and Bluetooth Smart capabilities allow for a wireless connection to both smartphones and bike computers. - No tangled wires on your bike to connect the sensor to your device. - The RPM speed installs easily with no magnets required - It only weighs 16.5 grams with the mount included - Provides accurate speed data during your ride - Mounts on most front wheel hub with a secure silicone casing - Two LED lights show the sensor's device connection (blue) and speed detection (red) - No charging required! Operates on a coin cell battery for up to 1 years. - RPM Speed will fit with most bikes and frame sizes