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Brompton rear sproket on a SA AW 3 speed hub
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Topic: Brompton rear sproket on a SA AW 3 speed hub (Read 1838 times)
Gattopardo
Lord of the sith
Overseaing the building of the death star
Brompton rear sproket on a SA AW 3 speed hub
«
on:
21 September, 2017, 03:42:57 pm »
Can I use a normal sturmey archer sprocket like this
https://www.tritoncycles.co.uk/components-c9/fixed-cogs-lockrings-c65/sturmey-archer-hsl-series-3-dog-sprocket-p17395
or does it have to brompton specific?
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Gattopardo
Lord of the sith
Overseaing the building of the death star
Re: Brompton rear sproket on a SA AW 3 speed hub
«
Reply #1 on:
22 September, 2017, 11:08:42 pm »
Anyone?
I know i'll have to run a 1/8th chain even with a 3/16 chain ring upfront.
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LittleWheelsandBig
Whimsy Rider
Re: Brompton rear sproket on a SA AW 3 speed hub
«
Reply #2 on:
23 September, 2017, 01:10:02 am »
If it is a normal (older) AW, then the normal SA sprocket is the correct choice. If it is a modern BWR hub, then you need a Shimano cassette spline cog. I'm not entirely certain about the modern AW on a current 3sp Brompton. You should be able to see the difference between the three half round keyways or the squared off Shimano spline, even with the cogs, circlip and all in place.
http://www.sturmey-archerheritage.com/index.php?page=history-detail&id=47
versus
http://www.jameshouston.com/sturmey-weather/
SA made both 1/8" and 3/32" cogs for their hubs but the Brompton 13t cogs were only 1/8".
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rogerzilla
When n+1 gets out of hand
Re: Brompton rear sproket on a SA AW 3 speed hub
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Reply #3 on:
26 September, 2017, 09:33:50 am »
The S-RF3 takes normal SA 3-spline sprockets. They will be flat and 1/8". I don't think the smaller ones are ever dished anyway (large SA sprockets can be dished, which doubles chainline options).
Up to a 15T will fit, with appropriate chain length.
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Brompton rear sproket on a SA AW 3 speed hub