The 15mm spindle is made from hardened steel and designed for bikes with axles from 15mm - 19mm.
The 15mm spindle is interchanged with the standard spindle (20mm spindle comes standard with the Tyre Changer) to accommodate wheels from mid size bikes, some older motocross and enduro bikes.
If you are unsure of which spindle you need, you can measure the diameter of your axles with a set of calipers, or Contact us. The spindle you need will be just smaller than the axle size that you measure.