Not a dumb question at all. I just came across this:
http://fagan.co.za/Bikes/Csuck/
Haven't read it, but it's a Sheldon referral, so likely to be good. (I
plan to read it myself.)
The general reason is that the chain does not disengage from the
bottom of the inner chainring; thus the chain gets
Chain suck is primarily caused by a combination of chain/chainring wear, filth,
and lack of finesse in one's shifting technique.
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So, my naive question this week is: why do so many frames bear the scars of
chain suck? I make no boasts about my own riding, none at all, in terms of
distance, longevity, or rigor. but I can't think of more than a couple of
times I've ever thrown a chain. What causes the chain suck?
Over-sh