With a Special, that is correct. You CAN fit the "next size up" rear tire with a blackwall. I have a 140/90 16 on the back of my 80LH. There is ALMOST room to stick a matchbook cover between the tire and swing arm on the left(driveshaft) side.
The front you could go to a 110, but it IS a tight fit with the caliper mounts on the Special. I can put the 110 on the Standard, but NOT my Special.

The front you could go to a 110, but it IS a tight fit with the caliper mounts on the Special. I can put the 110 on the Standard, but NOT my Special.

The bike I am trying to get together first is the SF frame.
This is a picture of the big 17 with proper spacers for the Special application.
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