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Shimano 9000

Yep, 11 of them. The new cogs are the same width as current 10-speed cogs, but the spacing is narrower. The rollers on the chain are also the same width as before. The chain is no longer directional. Photo: Nick Legan

Yep, 11 of them. The new cogs are the same width as current 10-speed cogs, but the spacing is narrower. The rollers on the chain are also the same width as before. The chain is no longer directional. Photo: Nick Legan