ST175/80R13 Velocity Load Range C (6PLY) New ST Rated Trailer Tires $49.99 Each ST175/80R13/C Velocity ST Trailer Tires. Wear resistant tread compound to maximize performance and reduce irregular wear. Wide water channels to help disperse water to help maintain stability on the road. We also offer this item with new wheels for trailers as well. Simply contact us today at Outdoortire.com for your DISCOUNT TIRES.