Title AP1 Alloy Seatpost No Frills. Simply Works Riders who push their bikes hard at the bike park, on dirt jumps, or in the backcountry need a seatpost that stays put and stays out of the way. The AP1 is machined from 2014-T66 aluminum, an alloy known for its fatigue resistance and durability under repeated impact loads. Zero offset keeps your position direct and centered, and four diameter options mean it fits a wide range of frames without adapters or shims. Features2014-T66 aluminum construction high fatigue resistance for downhill, freeride, and dirt jump use300mm length fits a range of frame sizes and rider proportions Four diameter options 27. 2mm, 30. 9mm, 31. 6mm, and 34. 9mm to match your frame spec Zero offset direct, centered saddle position | Title | Ap1 Alloy Seatpost 31. 6X300Mm Black | Aluminum