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http://yojimg.net/bike/web_tools/trailcalc.php
Use this site to find the wheel radiuses.
If you have a 700c wheel with 35mm tyres that is the equivalent of a 650b with 2.2" tyre. 700mm diameter tyre included.
With the 700c wheel mounted you can measure the clearance to determine whether the 650b wheel you want will fit.
I thought so too. Now I just have to find out if 650b even fits in the frame nicely. Unfortunately I can’t just test it :/