Join Date: Apr 2009
Location: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
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+1, eccentric cranks are normal to varying degrees and act like cams causing the chain length to vary. If it's slight you simply accept it, but be sure to set the wheel so there's a bit of slack at the tightest spot.. The chain cannot ever be allowed to be tight.
If there's more variation that you'd like, you can try loosening the chainring bolts, then tightening them only firm. Rotate the crank to the tightest spot, and hit the front of the chainring (3 o'clock) with a soft mallet, or a hammer, through a piece of wood. Do this trial and error until you find the least eccentric position, then tighten the chainring to keep it there. Finish by resetting the rear wheel a bit farther back if possible.
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