No one seems to acknowledge them, but I swear, a few years back, if you look at photos of TMECs on sites like this
http://mefastmotors.com/wholesale-mo...otorcycle.html page (the small thumbnail photos on the right) they had 17" knobbies at some point--maybe they were 18" knobbies, but I always thought they were simply swapping tires on the 17" rims. I could be wrong, however...