Kayaking on Swan Pond River and Swan Pond - in West Dennis MA. Put in at Beach Road. in West Dennis MA. Paddle up to Swan. Pond and return. Estimated round trip. distance = 6+ miles. South Village.
There are 2 components to Bottom Bracket (BB) size, the BB shell width of the frame and the spindle length. Bottom Bracket shell width: The BB shell is the frame tube into which the BB threads. It will measure 68mm, 70mm or 73mm wide.
If you are interested, here is the link to Sheldon Brown's article on tire sizing. The point is that a mountain bike 26 inch wheel has a smaller diameter than a 700c racing wheel. That means smaller circumference, so more rotations of the wheel in a given distance. This means more tire wear. My cycle computer manual gives the circumference of the 26x1.25 tire that I have on the bike as 195 cm.