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The Profile Imperial Sprocket has a 22mm bore
which will work with single speed thread-on freewheels that are 16t and larger
Low-profile concave shape
and the rear hub will work with 16t and larger freewheels (not included)
thorn-resistant inner tube with an extra-long 48mm standard Schrader valve
Profile Race Mini Cassette Hubset - 36H - Black - USA Made 20" (451mm) The Profile Imperial Sprocket hasThe Profile Race Mini Cassette Hubset was designed to be the best all around hubset available suitable for trails, racing, street, and park use. This set is 36 hole with 3 8" axles front and rear. The rear hub has a 2 piece driver with a 16t cog included. These hubs are MADE IN THE USA! Color: All Black