Bbiologic™ Suspension Seat Post Suspension is a good thing - especially on small wheel bikes with high pressure tires. Our BioLogic™ seat post lets you float above the holes, bumps, and ruts in the road. The suspension mechanism is a special low-profile design to keep the folded size of the bike to a minimum. In addition to a striking forged clamp, the BioLogic™ seat post features adjustments for pre-load and side play. Fits all 16", 20" and 24" folding bikes with 34mm seat post diameter.