Customer Rating: Summary: Bike block Comment: You MUST purchase this if you plan on getting a bike trainer. It is great and really makes the bike stable. I was surprised by the size of it - it looks like it would be small but is in fact fairly large. Great product!
Unique, 3-level block simulates climbing and lets you set the level of difficulty Increase the intensity by stacking 2 blocks together for 12 different workout levels In-mold construction for stable durability Compatible with rear mounted trainers
