Tranz X Kitsuma External Seatpost The Tranz X Kitsuma External Seatpost is Trans X's most popular, reliable seat post for all-day trail rides all season long. It's available in both external and internal cable routing and three diameters to fit most modern trail bikes, along with not so modern ones. The Tranz X Kitsuma External Seatpost is as worry-free and low maintenance as possible so you can spend more time riding your bike and worrying less about maintenance. The Kitsuma Internal features a sealed hydraulic cartridge and coil spring with 7075 aluminum alloy construction and a hard-anodized stanchion, all designed to be long lasting through the worst conditions without developing excessive side to side wobble as the miles add up. Features Low maintenance sealed hydraulic cartridge and coil spring Lightweight 7075 aluminum Hard ano stanchion Lever not included Specs Drop: 125 / 150 / 170mm Diameter: 30. 9 / 31. 6mm Routing: External Weight: 580-600g Warranty: 2-year | Tranzx | Kitsuma External Seatpost 31. 6Mm, 150Mm Travel, External Routing | Aluminum