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Make sure you are OK with that.
Since a 650B rim is 38mm smaller than a 700C rim, the radius will be 19mm smaller putting that rear tire closer to the narrower part between the chainstays.
With that said, try ro borrow a set of wheels and see if it fits.
good idea... I couldn't find anyone so I bought a cheap set ~$400 then upgraded. Ofcourse I knew I had room for 42's easy peasy.
I'm not sure what a smaller 650 setup would feel like, but I suspect the handling would be worse and maybe a little too twitchy. On the other extreme, I frequently used 650x48mm and they definitely make the bike handle different on the road. Cornering isn't as precise and the amount of rubber on the road is noticeable in terms of self-steer (depending on pressure). They perform very well in rough conditions though where volume is your friend.
Edit: keep in mind, the BB height will be a lot lower going from 700x38 to 650x38 - could be a serious pedal strike issue.
BB drop and BB height from the ground are two separate things. The drop refers is in relation to the axle height. A smaller wheel/tire diameter will lower the whole bike, thus lowering the bb height. Pedal strikes can definitely be an issue depending how and where you ride it using smaller wheels and tires.
Yep, they are about the same. Iâ€™m pretty sure your stigmata will do 650x42. I have a friend thatâ€™s runs that, but not sure what frame year he has.
You should be alright - but if it were me, I'd try to test it by borrowing a 650b and see where the tire lines up.
this is rim/tire dependent. my 42's ballon to 43.xx on 24mm internal as I stated but I have not measured them in a few weeks. The might have grown.
if you have tires that actually measure 42 you could run them, but I wouldn't do any mud.