Jiaxitek Bicycle Seatpost Shock Absorber, Adjustable Alloy Lightweight Bicycle Suspension Seatpost 27.2mm Shock Absorber Post Road Accessory Pole for Road Mountain Bike Fixed Seatpost (Saddle Clip)

Shock Seat Tube Outer Diameter: 27.2mm, Length: 350mm, Travel: 43mm. Bicycle suspension bars are preloaded with adjustable suspension travel for most bikes, race bikes, city bikes, folding bikes and regular bikes. The suspension spring shock seat tube can be adjusted for firmness, use an Allen key to adjust it to the desired suspension height, extend the spring travel and loosen the hex bolts, if you want more suspension, just tighten the hex bolts. To test, spin a few times based on your weight, then adjust the number of spins based on your weight. Package includes: 1 bicycle seat tube shock absorber