Important: if you have a cone ring with 4 or 6 mm additional width (or a bottom bracket shell with 72 mm or more width, please order the adequate grooved nut for the left side. If you use the standard nut, the left axle bearing won't be guided and therefore the whole crankarm-axle unit will have play (-> I.16.6..

From left to right: standard grooved nut with 45° shape, nut +6mm with 90° shape, nut +6 mm with 45° shape