Check the selection of BMX tires at the LBS. Many of these take 100 psi, are at least 50mm wide and come in a variety of tread from full knobby to virtually slick. And the bonus, they are not nearly as expensive Schwalbe models. For example, my new leaning trike has a Sterly Snafu 52-406 tire on the front wheel drive. Nearly slick and sticks like glue for doing ultra tight turns on tarmac.
:)ensen.