If you worry about your stability when using bike trainers, then the CycleOps Climbing Riser Block is the one for you. Use alone for three different difficulty levels or combine two blocks to create 12 different levels.
Product code: 143987
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Provides a stable ride with any rear wheel-mounted trainer
Unique 3 level design to select difficulty level
Stack 2 blocks to simulate climbing workouts
Injection moulded construction is virtually indestructible