The Excess steel cog is a straightforward rear cog with a Shimano fitment, so it goes onto any cassette hub built to that standard. It comes in seven sizes, from 12 tooth through to 18 tooth, which makes it an easy way to try different gearing on a race setup.
It is machined from steel and finished in black, with no other colour offered. The 16 tooth version is listed at 30 grams.
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