Features The Radial 857 is Kumho's core range for commercial vans and is widely accepted for its durability, traction and high mileage performance. Available in some 30 sizes including T and H speed rated low profile fitments for the latest generation of vans. Deep zig-zag grooves for increased mileage and traction. Straight centre groove and optimised sipe sequence on all four ribs to improve ride and noise levels.