Sturmey archer am hub, no snapring?

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seph
Posts: 165
Joined: 3 Sep 2010, 8:22pm

Sturmey archer am hub, no snapring?

Postby seph » 29 Oct 2016, 4:31pm

I have an alloy shelled AM hub, which I'm finally building into a wheel. It has a sprocket fitted, which I want to remove to allow room to spread the spokes. However the hub does not appear to have a snapring holding the sprocket on, is the sprocket likely to be threaded as suggested here https://colwoodwheelworks.co.uk/sturmey ... t-problem/ and would the lock ring holding it in place be threaded like a fixed wheel lockring ? (afraid I cant upload any pics..) I'd like to know before I get too carried away trying to remove it.

If it is the case that it is threaded, is it worth replacing the driver with the more usual sturmey type?

thanks for any insights.

seph
Posts: 165
Joined: 3 Sep 2010, 8:22pm

Re: Sturmey archer am hub, no snapring?

Postby seph » 29 Oct 2016, 5:20pm

Ah, thought I'd try a speculative tap with a screwdriver and the lockring un locked.

It seems I have a 12 splined lockring, how exotic!

Brucey
Posts: 43049
Joined: 4 Jan 2012, 6:25pm

Re: Sturmey archer am hub, no snapring?

Postby Brucey » 29 Oct 2016, 7:55pm

IRC the lockring is threaded, the sprocket is splined.

IIRC the AM hub can use an AW driver, so there is no real reason not to swap to a more conventional driver that uses a 3-lugged fitting. The 12-splined sprockets are getting hard to find these days.

cheers
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seph
Posts: 165
Joined: 3 Sep 2010, 8:22pm

Re: Sturmey archer am hub, no snapring?

Postby seph » 29 Oct 2016, 11:49pm

Ah yes, I meant 12 splined sprocket...

It's in good condition, so I'll keep it on for now. I can always swap the driver in the future if necessary.

scottg
Posts: 891
Joined: 10 Jan 2008, 8:44pm
Location: Highland Heights Kentucky,, USA

Re: Sturmey archer am hub, no snapring?

Postby scottg » 31 Oct 2016, 12:49pm

The lock ring is the same as a track lock ring,
I have a Shimano Dura ace lock ring on my FC & AM hubs.

Hillary Stone has the splined cogs.
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Deutsche Luftschiffahrts-AG
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