# Thread: What does 650b mean?

1. ## What does 650b mean?

I know two things about 650b tires: 1. They are larger than 26" 2. They are smaller than 29".

I can understand the benefits of a tire that is more of a middle ground, that's not my question.
I'm just wondering exactly how big the rims/tires are when classified 650b. If someone could put it in inches of diameter that would help..

Newb question I guess.

Thank you tho

2. Originally Posted by zaner123
I know two things about 650b tires: 1. They are larger than 26" 2. They are smaller than 29".

I can understand the benefits of a tire that is more of a middle ground, that's not my question.
I'm just wondering exactly how big the rims/tires are when classified 650b. If someone could put it in inches of diameter that would help..

Newb question I guess.

Thank you tho
Rim size is measured in millimeters by the bead seat diameter.

mtb 26" = 559
650B = 584
700C/29" = 622

Tire diameter differs with width.

3. 27.5"

4. it's not just a wheel size man, it's a way of life

i'd like to direct you towards my essays on what 650b means to me

...jk

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