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)