wvm, I experienced this with my first fixed build, think it was a combination of axle nuts not being tight enough, wheel edging forwards, chain slacking and jumping off. Had a pretty terrifying moment when chain jumped off on a main road going down hill... that was one big skid!
Try running your chain a little tighter and get those nuts nice and tight, also check your chain when spinning the wheel to make sure there is constant tension.
And if you're trying to skid, make sure you're unweighting the back wheel a bit, almost skipping into it, means using alot less brute strength...
wvm, I experienced this with my first fixed build, think it was a combination of axle nuts not being tight enough, wheel edging forwards, chain slacking and jumping off. Had a pretty terrifying moment when chain jumped off on a main road going down hill... that was one big skid!
Try running your chain a little tighter and get those nuts nice and tight, also check your chain when spinning the wheel to make sure there is constant tension.
And if you're trying to skid, make sure you're unweighting the back wheel a bit, almost skipping into it, means using alot less brute strength...