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stoker stem 250mm ctc

Mark Tipping2026-02-01 11:17:07

I have tried ebay etc but the only available bits are in the USA and I am less keen buying from there these days......

I am after a stoker stem basically the same as the co motion one fitted on our non electric tandem, to go on our new to us "assisted" tandem.  It needs to fit 27.2mm upwards diameter seatpin, and have 250mm centre to centre (to the handlebars), preferably 31 OS bar fit but I can work with 25mm if that is what is available.

Stuart Hibberd2026-02-01 15:16:01

I use the Thorn Stoker extension, unfortunately it is no longer available in 170 or 220mm. only available in 120mm it seems.

You can just add the ahead stem of your choice to get the extension required.

This 145mm stem would get you to about 248mm extension maybe.

https://www.ebay.co.uk/itm/127098197336?var=428219243829

 

 

 

Jamie Gray2026-02-01 19:30:34

Hi Mark, 

you will need to shim the seat post from 27.2 to  the correct stem steerer 28.6mm using a USE shim 

https://www.use-components.com/products/27-2mm-i-d-shim?_pos=1&_sid=b644fe672&_ss=r

it's works and is a cheap solution to using road stems on a seat post. 
cheers.