36mm,timi rattler had one that fit the beast,just not sure what to un-do? and why come to think of it? i know someone who had problems with his chain slack/tight when he put the rear on again? im ok with bmx's
Got mine out OK, just remove the spindle nut, and tap the spindle out, watch the chain though through the swingarm (braced area) put a rag etc there to stop the chain scratching the s/arm.
Also watch the brake caliper bracket
The hardest bit is getting it back in as the spacer inside the wheel between the bearings drops a tad so when refitting your trying to hold the wheel in place keeping the caliper bracket lined up all with the swing arm as you push the spindle in to find it needs some jiggery pokery to aid it's insertion, basically you need a 3rd hand!
Funnily enough JHP do a rear wheel mod to overcome this, they developed this for last years race bikes, and to reduce the time it takes to change wheels
it is very easy to chip the paint on the swinging arm, so be careful.
i remove the brake caliper from the carrier so that i don't have to get it aligned when i am putting the wheel in place, but a lot of people seem to manage with it still in place