sturmey 5 speed

For discussions about bikes and equipment.
webber
Posts: 261
Joined: 2 May 2012, 3:48pm

sturmey 5 speed

Postby webber » 10 Mar 2018, 5:39am

is it possible to narrow a sturmey 5 speed hub (https://www.sjscycles.co.uk/hubs-intern ... b-36-hole/) to fit a 120 frame???

Brucey
Posts: 35951
Joined: 4 Jan 2012, 6:25pm

Re: sturmey 5 speed

Postby Brucey » 10 Mar 2018, 9:24am

the coaster brake version?

No; the brake makes the hub a bit wider than the rim brake version.

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

AM7
Posts: 282
Joined: 18 Jul 2014, 10:24pm
Location: North West Essex

Re: sturmey 5 speed

Postby AM7 » 10 Mar 2018, 10:47am

I got my SRC5 down to about 122mm by replacing the big locknuts with narrower ones.

Brucey
Posts: 35951
Joined: 4 Jan 2012, 6:25pm

Re: sturmey 5 speed

Postby Brucey » 10 Mar 2018, 12:55pm

on the other hand one would be well advised to install a locking washer on the RHS in order that the RH cone doesn't precess into the hub and smash it to bits. SA's current owners think this it is a good idea to leave this out, despite the fact that the previous 100 years have seen this as a consistent (and necessary) fitment.

This means that there is no real scope for narrowing the OLN on the RHS; even with thinner locknut fitted the spacing is about the same once the necessary washer is fitted. There is a bit to come on the LHS, not much.

A rim brake version of the same hub (S-RF5) can be spaced down from 120mm (stock) to about 116mm IIRC.

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