20mm um yummy! dont rub it in, im already getting my other rim set up with the some wets but im not riding to long if it pours cause the motor is all new and i have open stacks , plus im scared of the electrical gremlins that come out when it rains with these things. But i cant deside weather to go full wet or superbike rains(cut rear slick)lmao! other than that its slicks and ill ride on them if it sprinkles to a certain bit. Good luck with the sunny weather! cheers