Fly Tractor XL2 SprocketFly's Tractor Sprocket has seen many changes over the years with the Tractor XL2 being the latest result of their improvements and refinements. CNC machined from 6061 aluminium with a very unique and extremely strong tapered design, that starts at 12mm at the core tapering down to 6mm at the teeth. The Tractor XL2 features a recess for your crank arm creating an even more secure fit. The Fly Tractor XL2 Sprocket can be run on 19mm, 22mm and 24mm