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I take it you don't have any 650b wheels lying around to test? In which case, grab a ruler and measure the clearance where they would sit, should give you a pretty good idea...
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Thinking of changing to 650b on my kona dr.dew to get a bit more traction in the snow.
Running different tyre and pressure would make a good difference, if you haven't already, dropping it to 35psi will give you a surprising amount of grip.
Listen to @andy_k's advice, also if you have a LBS that have the latest stuff that you're friendly with, you can ask them to put a 27.5" MTB wheel on the rear to see how it is.
In theory it should work fine, @mi7rennie's Genesis Croix de Fer have just about enough (read - not enough mud clearance) for 27.5 x 2.1 tyres;
atk
edscoble
@Irishane
Thinking of changing to 650b on my kona dr.dew to get a bit more traction in the snow. If the frame can fit 700x35 tyres with mudguards and room to spare what are the odds of getting 650x57 winter tyres in there? Its a p2 fork on the front so plenty wide but I'm not sure how the rear would work out .Seems like @edscoble is the one to ask.