Special spark plug sized nut (21mm) for the rear wheel spindle, cuts down on the number of tools you need to carry in your bum bag.
CNC machined from billet 7075 T6 Ergal Aluminium alloy.
Anodised finish also helps prevent corrosion.
M17 x 1.5 mm pitch
CSP - M17x1.5 Wheel Axle Nut for 21mm Plug Spanner