Stonesie

It is a 24mm nut and the hex head on the spindle is 22mm, although I didn't need to hold the spindle to get the 24mm nut to tighten... Oh yes, you need to tighten it to 100N:m when you are done so a torque wrench will be required. A good 1/2" drive, 6 sided 24mm impact socket is the weapon of choice.

A word of caution, the little plate under the nut might want to join in the fun and turn with the nut, this will scratch the paint from you're swing arm if you let it, the best way I have found to get it off is with my Impact gun, with a bar you have to 'jerk' it to brake the bond between the 2 and mine have been treated to a smear of grease to stop the plate spinning next time.


Beaten to it because i went and checked.