Shimano nexus gear shifter user manual9/17/2023 ![]() ![]() Reader Alesu has kindly provided translations from German of technical documents about DG-7 series hubs including rebuilding isntructions for a couple of additional ones. Rebuilding instructions from Shimano in English are available only for one coaster-brake model and one freewheeling model, though others are similar. The newer C3000-series hubs are significantly different from earlier ones, with pawls on the axle rather than the insides of the sun gears. SG-7 series hubs went 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 7-speed hubs is in the Dealer's Manual. The table links to current Shimano documents, but also to 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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