If you use an indoor bike trainer, you need a good riser block to maintain your stability. The CycleOps 3-Level bicycle trainer riser block is a unique three-level design that lets you pick a height for your front tire that will stabilizes your bike for a worry-free ride in any rear-mounted trainer. Just set your front wheel on your choice of height grooves and you can replicate your outdoor riding posture and never leave home.
⚠ WARNING California Residents:
Proposition 65 Warning