Brompfication make the neatest if you don't have an IGH. https://www.sjscycles.co.uk/gear-spares/brompfication-chain-tensioner-2-speed/
I'm probably going to waste money on silly brakes and frame braze-ons, I can't spend that much on the rest...
@Lolo started
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Brompfication make the neatest if you don't have an IGH.
https://www.sjscycles.co.uk/gear-spares/brompfication-chain-tensioner-2-speed/