BIKES THAT FIT WOMEN under 5'4"

[Triskeliongirl]

I guess I'm missing something here. Why the minimum tire size? Is that determined by the rims you put on the frame or by the frame itself?

If you go to the link above, there is a 15 page pdf file you can download about the bike. For some reason Grant designed it to use a very non-standard wheel size, 650B. He says that tires for 650B rims only start at 30mm and then go considerably wider. I think he chose them over 650C since while 650C tires are available in racing widths, the widest they go is 28mm. THat's the catch.

HEre is the relevant section of the pdf:

What’s the Bleriot frame/bike?
It’s a multi-purpose bike built for 650B wheels. The rest of this brochure
goes into more detail.
What’s a 650B wheel?
It’s bigger in diameter than a mountain bike 26-inch wheel, and smaller than
a typical road 700c wheel. Rims are sized by something called “bead seat diameter” (bsd)—the diameter at the point where the tire bead nestles to the rim. Every tire made has its bsd molded into it, because bsd is the universal language of rim & tire compatibility. Here’s a chart.

rim size bsd
700c 622mm
650B 584mm
26-inch (mtn) 559mm

Why 650B?
A 650B wheel is smaller than a 700c wheel, so it allows more tire and fender
clearance, which is especially helpful on small-to-medium sizes.

650B history:
Bikes with 650B wheels go back 60 years, and still have a strong following in
France, with a growing, fan base here in the United States. It’s a smart size that one could argue should have been the mountain bike size, but in the frenzy to get a bike out there, it was easier to use the current mountain bike size (559mm bsd 26-inch), and once that caught on there was no going back.

Tires:The 650B tire that people think of when they think of 650B tires if
they think of 650B tires at all, is one that’s about 36 to 38mm wide and runs
on 30 to 50 psi. You can get 650B tires as narrow as 30mm and as wide as
41.5mm. Start off with a 33 to 38mm tire, and see how you like those (you will like those).


p.s. The 650C tire found on many wsd racing bikes have a bsd of 571 and are not interchangeable w 650B. I do not believe this frame will support a 650C rim but I am not sure of that. One reason I went with the terry bikes with the 700c/24" combo is that 24" (520 bsd) high pressure tires are available in sizes ranging from 23c racing to 32c touring, the range I was interested in using.