![]() Most parts lists include some compatibility information, and many are formatted similarly so that you can compare them visually (like an astronomer looking at two sky photos in a "blink comparison" when searching for an exploding star or an asteroid). Better lubricationis recommended to forestall this problem and to make cleaning and rebuilding easier. The right-hand hub bearing cup is vulnerable to damage from water contamination. It can usually be replaced with a newer version as long as the hub is of the same basic type (with or without coaster brake). Replacement parts availability is a concern, and so you may have to substitute an internal assembly from a different model.The internal mechanism of these hubs is complicated, and the usual repair is to replace it in its entirety. Wouter Pasman's disassembly/reassembly instructions also include this information. Rebuilding instructions from Shimano in English are available only for one coaster-brake model and one freewheeling model, though others are similar.ĭid you go too far when tearing down a hub? This site also includes information from reader Keith Lang on how to rebuild the axle unit of the 7-speed hub. ![]() The 7-speed hubs have gone through several minor design changes, resulting in new model numbers and parts incompatibilities. Overlocknut spacing can be reduced somewhat by using a different locknut and omitting the Rollerbrake, as described on the Rollerbrake page. Shimano 7-speed hubs have a overlocknut spacing from 127 to 130 mm, as sold - see Shimano's overlocknut spacing chart. ![]() General information on installation and adjustment of newer Shimano Nexus hubs is in the Dealer's Manual. ![]() The table links to current Shimano documents, but also documents generated outside Shimano, or which Shimano no longer offers. ![]() The table below lists models of first, coaster brake, then freewheel/Rollerbrake Shimano 7-speed hubs from newest to oldest. ![]()
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