I have, but the Forte 27 x 1s with Kevlar belts that I got with the bike haven't flatted yet. Until they do, or they wear out, I'm leavin' well enough alone.
It's a
SunRace R30 13-25 7-speed ramped freewheel, JayBlurr. It mates up with my Cyclone rear derailleur really well.