Tyre size interchange 700 x38B = 700 x 38C?

[my.motion]

Hi All,

My motor front Tyre hub says 40-635 which converts to 28 x 1.5 or 700 x 38B. I want to change the tyre to a more robust one.

I have been searching for (marathon plus) this size on ebay/evans cycle to no avail. What I have noticed is that 700 x 38c is also advertised as 28 x 1.5 my question is that can I fix this 700 x 38c (marathon plus) to my wheel rim which is 700 x 38B.

What other sizes are similar to 700 x 38B ? It seems that not many people know much of the 700B standard

Thanks for you help in this matter

Regards,

Motion

 

[flecc]

If you have a look at the link below, you'll see that Schwalbe do make the Marathon Plus in your 40 x 635 size, it's the bottom one on the list.

The A, B and C suffixes are related to the second number in fact, 38 in this case, despite the common references to 700c and the like. They are the actual sections, A = 1 3/8", B = 1 1/2" and C = 1 5/8", though just to confuse things as ever, the C size in practice is actually 1 3/4".

In practice all the approximations fit the same modern rims and I never bother with looking at suffixes, just so long as the mismatch isn't huge, for example, a balloon tyre on a narrow rim. The problem with tyres of slightly different sections not fitting rims was largely a pre-World War 2 one when the standards meant rather different things, the actual rim diameter changing with different sections.

Schwalbe Marathon Plus Tyre Range
.