BrakesĪlfine hubs have the Shimano CenterLock fitting, which accepts a proprietary Shimano disc brake rotor. Gates carbon-fiber belt drive also is available for some Nexus and Alfine hubs. This is especially important with a coaster brake, which will become inoperative if the sprocket slips off.
#Shimano nexus 3 speed hub manual install#
Sturmey-Archer circlips, made of round cross-section wire, are easier to install than the Shimano ones with a square cross-section.Īfter re-installing the sprocket, it is a good idea to seat the circlip by going around it and tapping with a hammer and punch.
The circlip snaps on, also most easily by levering it into position with a flat-blade screwdriver. The circlip can be pried off with a thin flat-blade screwdriver, and the sprocket can then be lifted off. The sprocket is held in position by a spring circlip (snap ring). Because the shifter mechanism is between the right-side dropout and the sprocket, the chainline is desirably narrow in spite of the large overlocknut spacing of these hubs. Most sprockets made for this system are "dished" so you can adjust the chainline by flipping the sprocket over. This is especially helpful if the hub is used with vertical dropouts and a chain tensioner. A worn chain will run poorly on a new sprocket.Īlfine sprockets include a protector ring which helps to prevent a loose chain from coming off.
A larger sprocket requires a longer chain. By changing the sprocket, you can raise or lower all of the gears at once. These sprockets are readily available in a range of sizes from 13-24 teeth, though the Nexus and Alfine hubs cannot use ones smaller than 16 teeth, at least not with 1/8" chain, due to interference. Nexus and Alfine hubs use the same 3-spline sprockets as other internal gear hubs from Sturmey-Archer and SRAM/Sachs, also used on most coaster-brake hubs. I have drilled and tapped a Nexus 8-speed for a Sturmey-Archer oil cap, A reader, Albert van Dalen, suggests a simpler solution: drilling an oil hole in the hub shell and covering it with duct tape. The page covering this hub gives more detail about this. Do not lubricate the cassette joint (cable attachment parts) - see advice below. Coaster-brakes, however, cannot be oil-lubricated they must be lubricated with a special high-temperature grease. Relubrication using oil and waterproof grease is highly recommended to keep water out of the mechanism. He has tools to extract the bearing race, resurface it and replace it. Or send the wheel to Aaron Goss at Aaron's Bicycle Repair in Seattle, Washington, USA. If the bearing cup becomes pitted, you have two alternatives: replace the hub shell - then it is usually most practical to replace the entire wheel. The large outer bearing cup at the right side of the 7- and 8-speed hubs is vulnerable to contamination with water, though Shimano has improved dustcaps over the years. Electrical shifters work with drop bars or flat bars. Some 8- and 11- speed models have electrical shifting.
Shimano sells cable-operated shifters for these hubs only for flat handlebars, but aftermarket (JTek, Microshift) shifters and a Hubbub adapter are available to fit drop bars. See our Rollerbrake page for information on installing and removing the Rollerbrake.Īlfine hubs have an overlocknut spacing of 135 mm and a Shimano CenterLock disc-brake fitting. If there is no Rollerbrake installed, the overlocknut spacing can be smaller, down to about 124 mm, using a thinner locknut. Some of these hubs have a coaster brake, and others accept the Shimano Rollerbrake, a kind of drum brake. Additional spacers can take hubs out to 135 mm. Nexus 7 and 8-speed hubs have an overlocknut spacing ranging from 127 to 135 mm, as sold: see Shimano's overlocknut spacing chart.
#Shimano nexus 3 speed hub manual manual#
Shimano published a Nexus dealer's manual (now archived), with most of the needed information about Nexus 5, 7 and 8-speed hubs however, there is additional information in documents (some also now in the Internet Archive) linked below and on the page for hubs with each number of speeds. Alfine hubs feature fancy features including optional hydraulic disc brakes and electronic shifting. Alfine is a high-end product line with 8 and 11-speed hubs. Shimano Nexus 3, 4, 5, 7 and 8-speed hubs are currently in production as of 2014.