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Oops, my mistake on the chain ring drives.
I think I’ll try and source a hub brake wheel first and see what I need from there.
The bike came with a 3spd SA with a ‘63 date stamp and the rear chainstay bridge is drilled (for a mudguard fitting) so I could technically fit a caliper brake... but I’d rather not.
And on your offer, would be glad of any advice and where also to try and hunt for rods and adjusters for the rear hub.
Am over near Reading.
crossedthread
Surely the inner ring on a tandem takes the drive from the front, so it has no effect on the
gearing.
You can't use Jeff80's block with a Sturmey without serious engineering work - most Sturmeys have a 3 spline fitting for the sprocket, not a thread.
I should make it clear I've never used combination gearing on a tandem, and I'm not absolutely certain whether a standard Sturmey spindle will stand up to the extra weight of a tandem.
I do have a contact who has a longstanding passion for old tandems, and who might be prepared to help. I can ask if you want - where abouts are you based?