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- #Shimano nexus 3 speed hub manual how to#
- #Shimano nexus 3 speed hub manual manuals#
- #Shimano nexus 3 speed hub manual pdf#
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A video of disassembly and reassembly is available here. Most other Nexus hubs are similar to the ones described.
#Shimano nexus 3 speed hub manual pdf#
Information on how to maintain and rebuild Nexus 3-speed hubs is in PDF documents linked below, now accessible only on the Internet Archive. New developments include electrical shifting and a disc-brake version.
#Shimano nexus 3 speed hub manual manuals#
File only the bottom of the slots, so you can be sure that the axle sits straight.ĭealer's manuals, user manuals and parts lists for all currently supported Shimano 3-speed hub models is accessible with this search. The dropouts of an older three-speed bicycle will need to be widened to fit these hubs. As long as the round, threaded part of the axle contacts the faces of the dropouts so the axle sits straight, another Shimano anti-rotation washer could probably be substituted. A brown washer, Type 5L, is specified for the Rollerbrake version, also installed on the left side. This is normally a right-side washer (so, the "R") but is shown on the left side in the documentation of this hub. The installation instructions specify a yellow washer, type 5R, for the coaster-brake version of the hub to place the axle with its round sides in the edges of the dropout slots. Torque on the axle from the gear train is relatively low, and so the bellcrank-shifting hubs use only one non-turn washer, at the left side. The yellow line on the paddle should be between the two yellow arrows. The Nexus 3-speed bellcrank is aligned in second gear. With these hubs, the orientation of the axle does not affect shifting, and oil lubrication is possible by removing the bellcrank and pushrod, then squirting oil into the hollow end of the axle. Most Shimano 3-speeds use a bellcrank and pushrod for shifting, rather than a pulley concentric with the axle. Any good bicycle mechanic will be able to do this, or you can do it yourself. It is usually possible to spread the rear triangle of a steel ( Cromoly) frame to the needed width. These are listed for most hubs in the hub dimensions document linked below. Various Nexus 3-speed models have overlocknut dimensions between 127 and 135 mm. See the article on internal-gear hubs for detailed advice. The low and middle gears are then better for acceleration and climbing, too. A 3-speed hub will work better for you if you change the sprocket or chainwheel to lower all the gears, so you use the top gear on level terrain. They fudge a bit, lowering the gears in order to keep the top gear from being completely useless, but then the middle gear is too low for level-ground riding. The range of the Shimano Nexus hub is slightly wider than that of other 3-speed hubs: Ratioīicycle manufacturers often assume that the middle gear of a 3-speed hub is the "normal" gear. With any of these brakes, a front brake also should be installed - see my article about braking and turning. The disc brake gets very hot but is made to withstand the heat.
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The Rollerbrake also is somewhat prone to overheat, though the newer high-power model is less so, with its finned heat sink. The coaster brake is only suitable for flatland use: it will overheat on long downhill runs, like any coaster brake. The current (2017) generation of Shimano 3-speed internal-gear hubs is available with a coaster brake or with an optional external Rollerbrake or disc brake. Shimano SG-3D55 3-speed hub with disc brake