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Old 03-18-20, 02:55 AM
Join Date: Mar 2020
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It is a relatively new road chain width standard. 11/128 means a width of 11/128 inch as popular single-speed widths are 3/32 and 1/8. Initially, it is invention for road bikes with multy-speed cassettes and name "KMC X11" states for 11-speed chain. Chain rollers have 2.18-mm nominal width so cassette sprockets and chainrings must be of 2.0-mm width.

German women reportedly used these chains and rings at Berlin 2020. Dutch machos clearly stayed on 1/8 Izumi V-Chain.
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