Well, there may be inconsistencies with the ambi. skidding calc. on Sheldon's site...

http://www.sheldonbrown.com/fixed.html#skid

and

http://sheldonbrown.com/gloss_sa-o.html#skidpatch

I haven't found the time to sit down and break down the proof or write an algorithm to brute-force verify it... But yeah, rabbit currently uses the more restrictive of the two definitions...

tom.