I have the SZ50s on my PGT's summer rims. They are a typical Z-rated tire for harshness but have a great tread design. This design unfortunatly picks up all road gravel and junk and tosses it up your wheel well. What I like best is the rim saver rubber that protrudes out past the rim. After two summers these tires have ample tread left, they look almost new.
Have fun,
