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1x conversion thoughts

Stephen Carson2026-09-02 15:43:09

Hi,

I'm thinking of converting the winter tandem to a 1x12 setup

46 or 48 chainring

11-50 12 speed cassette on the back

I know I would be happy with an 11-50 (or at least the initial 10 sporkets), I've had a couple of 10 speed 11-36 cassettes, the ratios on the 12 speed match the 10 speed plus 2 extra large sprockets to make up the 12 speeds.

Both my current tandems run 2x12 with cross over timing chain / belt, they are reliable systems so I am more than happy with 12 speed setups.

My thoughts turn to the timing chain.

What I would like to do is use a standard road double for me (the Stoker), using the inner chain wheel for the timing chain, and then have another standard road chain set on the front with just the inner ring mounted.  I like the idea of keeping everything on the drive side and also opens up the use of much more commonly available chain sets.

Has anyone done this?

My main thoughts are can I put a wide narrow 1x chainwheel in the outside position of a standard road double? Is there something that I haven't thought about?

I know there are divided opinions on 1x Vs 2x (Vs 3x). I'm happy to have the experiment and Iive and learn,

Thanks,

Steve

Stephen Carson2026-09-02 15:56:27

Please don't post on this thread, duplicated, please will an admin remove - thanks

 

Stephen Todd2026-09-02 16:04:01

One comment coming from a very different tandem setup; electric Ecosmo 1x7 for the odd 10 mile pootle. This may make it irrelevant, but it does have the chain setup you mention. 

If one of the chains comes off at the stoker position, the chains can jam very tightly together. Separating them is a really awkward. This is made worse on the Ecosmo as the bottom brackets contain freewheels to allow independent pedalling. You cannot turn the cranks backwards to help release the chains.