Saris - Climbing Block

For a stable, worry-free ride with any rear wheel-mounted trainer. Unique 3-level design lets you select the level of difficulty. 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. Specifications 2.1 inches (5.3 cm) 2.7 inches (6.8 cm) 3.1 inches (7.9 cm)