<ul><li>Important Note. Please do measure the actual required diameter before purchasing.(There is a safe line mark on the seat post. Please insert at least above the minimum safety line.)</li><li>Adjustable&Fixed. Adjustable Seat Post Clamp ,Make your riding more comfortable convenient to install.With Fixing Clip(No need to purchase seat bag clamp separately)</li><li>Suitable for most mountain bikes, road bike, fixed gear bicycle, downhill bike, track bike, MTB, BMX, DH, etc</li><li>Superb Material. Seatpost made of 6061 aluminum alloy,Light ,strong and durable</li><li>If you have any problem with the product, feel free to contact us</li></ul><br><br>

Thinvik Bike Seat Post 350mm 25.4/27.2/28.6/30.4/30.8/31.6/31.8mm Adjustable with Fixing Clip- Aluminum Alloy Bicycle Seatpost Replacement for Road&Mountain Bike,MTB,MTN BMX -30.8mm