To fit frame seatpost hole: 28.6mm diameter, Extra long: 17.7" (45cm)
Important note: real measure of the seatpost diameter is a little smaller than the number marks on it. e.g.:25.4mm one may measures about 25.0~25.2mm only
Clamp is adjustable for the saddle tilt angle
Replacement seatpost for most bike, mountain bike, road bike, universal bikes