CASSETTE COG SPACERS
These are used when running a single cog on your cassette type rear hub. Made right here in the USA and anodized black, the set includes a couple 2mm spacers, a 4.5mm, a 10mm, and a 15mm. They work with all cog brands and all 7, 8, 9, and 10spd Shimano type cassette hubs except XTR hubs.
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