Functional bikes. Not Porn not Anti

Ok but you don't take care about BB high is just for pseudo "VERSATILITY" ?

Nobody gonna die when the BB is raised a bit.

When you can put 650b 2.3 tires or more I don't understand why it's interesting to put 29ers wheels with 2.1tires, ratio, BB high are changed. It's like putting 650c wheels in place of 700c wheels.
Where are the interest I don't know.

650B mean that it can fit those who are less than 5'4, and won't be too small for those who's over 6'4.

Currently 700c old road frame can easily be converted into a 650B with 38mm tyres which is getting quite common nowadays.