Join Date: Aug 2005
Location: Pittsburgh, PA
Bikes: '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
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Note to Tellyho: Shimano uses a 130 mm BCD for road cranks and chainring spacing isn't universal.
When they went from 8 to 9-speed, Shimano offset the middle ring (or small ring on a double) slightly toward the outside to get it closer to the big ring. AFAIK
, the spider arms remained the same thickness and the big rings didn't change either. So if you want to use an 8-speed chain with 9-speed rings, you will probably need to add thin spacer washers between the inner ring and the spider arms.
BTW, you could use a 9-speed chain and not have to respace the crank. The rear shifting shouldn't care.