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Old 04-05-11, 12:36 AM
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The roller brake is a separate unit which bolts onto the left side of the hub. The brake engages with splines on the hub. The Nexus 4-speed and 7-speed hubs use the same types of roller brake. I have a bike which came with the Nexus 7-speed and rim brakes. I later added a roller brake to replace the rear rim brake. Some hubs with no roller brake came with a plastic cover that fits over the splines.
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