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@D_Mars
The other problem with 650B is that to adapt a frame - you need to position the brake mounts higher - or else use something like Pauls Moto BMX brake to adjust the height of the pads - which increases mechanical advantage and reduces power.
Having a mini brainwave - I might be selling this frame / fork headset ...
Very lightweight Cannondale Killer V - Medium size 17" - Good standover & recently powdercoated at Armourtex - so pretty minty paint
Even has alfine chainset :-P