Sumitomo HTR Z5 255/35ZR19 96Y XL OVERVIEW The HTR Z5 from Sumitomo is an ultra-high-performance tire that's meant for use on tuned cars and performance-oriented compacts, coupes, and sedans. An rigid tread design enhances stability and grip when driving at higher speeds, and the HTR Z5's shoulders put more rubber on the road to enhance handling performance and reduce uneven wear.