Low car diet
Join Date: Aug 2007
Location: Corvallis, OR, USA
Posts: 2,407
Bikes: 2006 Windsor Dover w/105, 2007 GT Avalanche w/XT, 1995 Trek 820 setup for touring, 201? Yeah single-speed folder, 199? Huffy tandem.
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Outer chainring in middle position - spacers needed?
Converting the 28/38/48 chainrings on the commuter/touring bike to 28/42/bashguard. Shimano Alivio 104/64 BCD crank and chainrings.
I put the 42T meant-for-outer chainring in the middle position with the bashguard on the outer position and the gap between the 42T and BG looked too close. Re-mounted the 28T inner and the gap to the 42T was too big. I realize now that the outer chainring curves outward from the bolts to the teeth.
Anyone know off-hand the thickness of spacers needed between the crank spider and the 42T chainring to put the teeth at the same relative chainline as a true-middle chainring would produce?
Last edited by JiveTurkey; 02-14-12 at 01:31 AM.