As everyone know's gentlemen inches are much smaller than real ones but I have noticed that bicycle wheel inches seem to be a bit bigger than real ones. Out of interest I measured the diameter of the wheels over the tyres on my XC & DH bikes. Both have 26" wheels but measure 27" on the XC bike (2.2" Rubber Queen) and 27.25" on the DH bike (2.5" Minion). So what sizes are 650B and 29"? Are wheel sizes a random number that doesn't really mean anything?
Transition Patrol - viewtopic.php?f=10017&t=13070235