I brought some 2nd hand renthal's on here 22.2mm with a shim, think they are the motorbike ones as they have quite a wide centre before the rise can take some measurements tomorrow if you'd like. Feel wider than the straight ones my s2l came with..
From what I've read, (thinking bout putting risers on my s type) you can put any 25.4mm bars on, with 45mm rise being about the same as an m type hight
Been looking at getting wider bars and I reckon you could easily add 40mm without affecting the fold
what renthal bars are people using on their bromptons? and am I right in thinking they are to give some rise to S types?