SA 'AW' hub

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mig
Posts: 1550
Joined: 19 Oct 2011, 9:39pm

SA 'AW' hub

Postby mig » 21 Apr 2017, 10:27am

i've acquired one of these dated from 1980 i think to give a go as a winter option on a fixed bike.

the flanges look thin to me. is there a specific spoke type that works best with them?

thanks

ps. not that it particularly bothers me but this hub is HEAVY.

RobC
Posts: 74
Joined: 5 Feb 2008, 3:27pm

Re: SA 'AW' hub

Postby RobC » 21 Apr 2017, 11:04am

The first problem you'll run into is that it's not a fixed hub.

mig
Posts: 1550
Joined: 19 Oct 2011, 9:39pm

Re: SA 'AW' hub

Postby mig » 21 Apr 2017, 11:11am

sorry probably caused a bit of confusion there.

bike is fixed at the moment, hoping to give this hub a crack for next winter.

Brucey
Posts: 25200
Joined: 4 Jan 2012, 6:25pm

Re: SA 'AW' hub

Postby Brucey » 21 Apr 2017, 11:20am

a 1980 hub could have one or two plastic parts in it; in particular the parts at each end of the clutch spring may be plastic. These parts are not usually troublesome but do occasionally crack. The sun pinion is riveted; this rivet occasionally works loose or wears (it sees load in 1 and 3) but the hub ought otherwise to be reliable. It will have a neutral position between gear 2 and 3.

The hubshells on AW hubs varied over the years; some are heavier than others. The differences mainly lie in the LH bearing support piece which is a chunky lump of steel. IIRC in 1980 the bearing housing protrudes into the hubshell on the inside which (deliberately or otherwise) may prevent the hubshell from being used with a 5s internal in it. Any of the steel hubshells need spoke washers (one or two per spoke depending on the elbow length) with modern spokes if you want a reliable wheel.

Also, when building a used steel hubshell, it is worth following the original spoking pattern if the stagger in the new rim permits it; this gives the elbow bends in the spokes an easier time of it.

The hub may feel heavy but adding an SA hub to a bike adds about 1-2lbs vs a singlespeed (depending on the weight of the parts that are replaced) and up to about half a pound vs a basic 5s derailleur setup.

The hub feels heavy because pretty much all the weight is in that one lump with an IGH!

BTW it is possible to convert this type of hub to a 2s fixed....

cheers
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~~~~~~~~~~~~~~~~~~~~~~Brucey~~~~~~~~~~~~~~~~~~~~~~~~

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fausto99
Posts: 134
Joined: 19 Sep 2011, 10:06am

Re: SA 'AW' hub

Postby fausto99 » 21 Apr 2017, 1:06pm

Brucey wrote:BTW it is possible to convert this type of hub to a 2s fixed....


Well as I've said before, you learn something new every day! :shock: I'd never heard that before, even in my previous spell as a Moulton Club member when I messed around with hybrid gearing converting a 5 speed into an extra wide 3 speed.

Do tell, where can I find out more?

mig
Posts: 1550
Joined: 19 Oct 2011, 9:39pm

Re: SA 'AW' hub

Postby mig » 21 Apr 2017, 3:56pm

2 spd fixed? now we're talking...!

Brucey
Posts: 25200
Joined: 4 Jan 2012, 6:25pm

Re: SA 'AW' hub

Postby Brucey » 21 Apr 2017, 4:50pm

in 2s fixed form the hub has a direct drive gear (in the gear #3 shifter position) and a reduction gear (in the gear 2 and gear 1 shifter positions). There are various ways of doing the conversion, some of which are described (or linked to at least) on Sheldon Brown's site.

http://www.sheldonbrown.com/awfixed.html

However it should be noted that these conversions mostly suffer several problems

1) they are complicated or difficult or require special tools to implement

2) they are permanent conversions, there is no going back

3) they still leave the hub with quite a lot of lash in it

I have some ideas about how to overcome some of these issues. If I am successful I will let you know....

cheers
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~~~~~~~~~~~~~~~~~~~~~~Brucey~~~~~~~~~~~~~~~~~~~~~~~~


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