The Shimano Ultegra FC-6750-G 10-speed outer ring replaces the outer ring on Shimano Ultegra 10-speed compact cranksets with this factory 50-tooth chainring. Alloy Hollowglide construction. 110 mm BCD. Designed for best use with 34-tooth inner rings.
B-Stock - This product has one or more B-Stock units available. These units can be purchased at a discount (see option select). B-Stock units were returned from other customers and may have missing or damaged packaging materials. These units are otherwise as new. The full manufacturer warranty applies. Click Here for more information.
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Not sure if 20,000 miles was a good amount of miles on my first ring.
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A guide to understanding and calculating bicycle gear inches.