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Old 01-30-10, 09:06 AM
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Originally Posted by lverhagen View Post
These are great looking bikes! However, I am wondering what it would take to convert an old steel rigid mtb frame to 650b. I have been unable to find much advice here or elsewhere on the internet. My plan is to build a bike similar to porteurs of old with fenders and the whole lot. Any help is appreciated!

Probably not the best choice of frame to convert. You likely won't be able to use the existing canti brakes as you'll need to go from a 559mm wheel to a 584mm wheel, an additional reach of 12.5mm. You could go with hub brakes of some sort or a rear coaster brake, but then the frame might not have the clearance for the larger wheels. And the geometry of an MTB wouldn't be best for carrying front loads as porteurs were intended to do. You can put upright bars on your MTB and turn it into a cycle truck; I did that with an 80s Specialized Hard Rock or you can find an 80s road bike designed for 700c wheels as a better 650B candidate.

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