TX18 damping system Independent cartridge air spring and damper systems Designed for 200 mm rotor size, 255 max Easy to tune three-chamber air spring system Comes with 15mm axle 38 mm stanchion diameter 44 mm offset Floating axel design to minimize friction Compatible with maximum tire sizes up to 29" x 2.6 Axle to crown measurement: 583 mm at 170 mm stroke. RXF 38MM FORK 170MM