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27"=630mm wheel diameter minus 650B=584mm gives you 46mm, divided by 2=23mm. So check the drop on the current calipers you've got (if any) for 27" wheels and add 23mm. I reckon the drop would be too much.
You would be better off with a frame built for 700c or the old 26 X 1 1/4 for a conversion. -
I advised against it, 700c already have a long reach with the brakes, 650b way too much.
A lots of 80/90 steel frame (as long its 700c) is more than enough for 650b conversion.
If you want to stick with the frame, 700c plus big tyres and mudguard will work fine.
ElGato
edscoble
@uphilldowndale
Forgive me if this has been asked but I'm struggling to find any info online...
650b wheels in a frame designed for 27" wheels using loooong drop calipers. Can it be done?? Anyone here done it? I have a very old frame I'd like to squeeze some nice tires into.