CLUG Roadie fits tires 23mm to 32mm.
The original CLUG designed to fit the skinny tires on your road racers and urban fixies.

CLUG MTB fits tire sizes 1.75″ to 2.5″ (depending on the size of the tread).
This CLUG is designed to fit the fat, knobby tires you single-trackers grip-it and rip-it on.