42mm off the top of my head for the wheel side, I'll see if I can find the hub/sprocket side...
You don't need to undo that nut to adjust the chain though!
Loosen the two bolts at the back of the swingarm, and in his toolkit he should have what looks like a C-Spanner, this slots in behind the sprocket onto the castellated nut, that adjusts the eccentric hub, then retighten the 2 bolts, job done
[Edited on 27-6-2005 by JPM]
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