I may be drifting off topic, but: On my dinglespeed (Redline Monocog 29er, not a Quickbeam), grinding up steep hills in the lower gear will sometimes cause the rear wheel to slip forward - and this is with a bolt-on axle. Here's my theory: with no derailer, there's no worry of spurious gear-hopping so I worry less about how much torque I put on the cranks, and so I crank harder. For this reason I can put a lot more force into a derailer-less bike. So there might be something to the idea that wheel slippage is a greater threat w/o a derailer.
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