Originally Posted by urodacus
? because more force is directed across a cog in single speed mode than in derailleur mode as there are more teeth wrapped (ie contacted) by the chain?
i have a SS conversion like you and have to make the QR very tight on the back wheel. next hub will be bolted.
But that shouldn't matter, should it? A proper free-body diagram shows that the net force is still the same. The only difference I can see is that a derailer takes a
marginal amount of the force off the cogs due to the springs (if that -- my brain hurts).
But it's weird. I rode that bike thousands of km's: sprints, hills, everything, and never had the wheel slip. Switch to single speed and it's sliding around like a drunk on an ice rink.
Then again, perhaps the original derailer fiasco was
caused by a wheel slip and and not through derailer adjustment incompetence. Hmmm...