Three sizes ... there are 650A wheels too. 590mm diameter.
Rivendell is attempting to repopularize the 650B and is bringing it out on more bikes. Having short legs, I hope they succeed.
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"Too often I would hear men boast of the miles covered that day, rarely of what they had seen." Louis L'Amour
There are two types of road bikers: bikers who are faster than me, and me. Bruce Cameron - Denver Post