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Trying to find an online manual for for the Shimano 7 speed hub SG-7C21

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If there is one available it will be at www.shimano.com

Posted on Dec 30, 2010

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I need a repair manul for schwinn Breeze to take apart a 3 speed hub because a non shifting problem


Schwinn doesn't make the hub. You need to find out what brand the hub is. The three most common are: Sturmey-Archer, SRAM and Shimano. Then you can do some online research to find a schematic of your hub, or find a good repair manual like Barnett's, Park or Bicycle Magazine that have 3spd hub instructions.
Start with the checking the cable tension first before taking apart the hub, 9 times out of 10 that is the issue with a 3spd hub. If something is actually broken inside it will be very difficult finding parts, most places will sell you a whole hub but not the parts (these days the component is meant to be replaced not fixed).

Nov 09, 2015 | Schwinn Cycling

1 Answer

Shimano Service Manual


What sort of hub is it? The one that runs in oil is the Alfine - the others are greased, in my experience, although there is an dealer-approved means of refreshing the grease in a Nexus hub by dunking the internals into oil.
The Alfine 11 speed needs 25cc of Shimano SG-5700 oil assuming all the old oil has been drained first. This is according to a Koga Miyata manual for a bike that uses this hub.

May 20, 2013 | Shimano Internal Gear Hub Maintenance Oil...

1 Answer

I have been given a set of Mavic NKSIUM Race wheels currently fitted with a Campag Cassette. Are these hubs Shimano compatable, as I want to fit a 8 speed Shimano Cassette Ian...


Nope. Campi and Shimano casette bodies are TOTALLY INcompatible, BUT I have had good luck with finding Campi casettes online (eBay) and having no interchange problems between my wheels and Shimano or Campi 9-speed shifters and derailleurs on several bikes. I switch wheels without concern for the other hardware.

http://desc.shop.ebay.com/i.html?_nkw=campagnolo+8-speed+cassette&_sacat=0&_odkw=campi+8-speed+cassette&_osacat=0&_trksid=p3286.c0.m270.l1313&LH_TitleDesc=1&_rdc=1

Within Campi there may be incompatibilities, though. If your wheels have an 8-speed Campi cassette now I think you'll be ok.

Feb 09, 2011 | Mavic Cycling

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How to assemble the shimano nexus three speed cable to the nexus hub? Looks like you just push on and tighten the screw , seems to simple. Need someone else to advise me. thanks


Although i have not worked on a Nexus hub, Shimano's tech sheet page has your info. The Nexus drivetrain is found on the fourth category on the left (Comfort), and the hubs are 2/3 of the way down the page under "SG Internally Geared Hubs". i was not sure which one was yours (there are quite a few!), so i figured it best to just pass on the site to you.

Hope this helps,
matt

Sep 17, 2009 | Shimano Cycling

1 Answer

I need a manual for a Shimano nexus 3-speed hub installation.


http://techdocs.shimano.com/techdocs/blevel.jsp?FOLDER%3C%3Efolder_id=2534374302052334&ASSORTMENT%3C%3East_id=1408474395181679&bmUID=1248577311531

scroll down to Nexus

Jul 25, 2009 | Cycling

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