Originally Posted by
Camilo
The wheel sizes you mention are different. One is a 700C the other 650B. And there's no such thing as a "650bX40c. Widths are measured in MM, not "C". The letter in a wheel size does not refer to a size, but a naming convention, such as 700 tire would be 700c X 38 or 700X38c and the 650 tire would be 650bX40 or 650X40b.
Take a look at the Continental Terra Speed Good reviews for rolling resistance on pavement as well as mild traction situations. Probably not good for actual mud.
Terra Speed is another good call.
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