TTX18 RXF38 m.2 Fork - 170 mm 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 15 mm axle, 38 mm stanchion diameter, 44 mm offset, Floating axle 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