In a message dated 7/13/03 2:06:51 PM Pacific Daylight Time, Bikerdaver@aol.com writes:
> I now have what appears to be a bent crank spider arm(s) as
> about 90 degrees of the large chainring rubs the derailluer cage for each
> rotation. Does anyone have a way or repairing this? Should I take a mallet
> to it or
> what?
If you have a lathe available, mount the arm with chainrings on an axle (use
a bolt so it stays put), remove the bolt and put the assembly on the lathe
centers. Check your runout with a dial indicator on the chainring. There is a
tool for straightening the spider of a steel crank that is a heavy bar of steel
with a slot near the end that is wide enough to slip over a spider arm so that
you can lever it in or out a tad. You can make your own tool, but be sure to
radius the edges so you don't leave marks on the spider.
I suppose you could do this on the bike if you managed to mount a dial
indicator on either the downtube or seat tube.
Stevan Thomas
Alameda, CA