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Pitch Diameter (A/ 4L): 7
This R6-2RS ball bearing is a high-precision premium quality sealed deep groove 3/8"x7/8"x0
This 40BTB36 sprocket is a durable
Pitch Diameter: 63
D140B21 Sprocket With Stock Bore 60B24 Sprockets Pitch Diameter (A/ 4L): 7This D140B21 sprocket is a durable, high quality, and precision double sprocket with 21 hardened teeth. Sprockets that have hardened teeth last longer and are much more durable than those that don't. Something else that is notable about this sprocket is that it fully meets all ANSI Standards, which insures proper contact between the #140 2 double roller chain and sprocket thus preventing premature wear or breakage. This sprocket is also black oxide
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