I haven't actually had Sumitomo on any of my personal vehicles. I have installed them on several vehicles and received mixed reviews. The good reviews come from the passenger/touring type vehicles, and the generally negative reviews come primarily from people with sports cars. The general downfall was that they are just not sticky and are fairly squirmy even after being warmed up.
My impression is that Sumi tires are a good cost option, but they leave you wanting in the performance department. For that reason, I would rather save up a little more money and just spend for the more capable tire than get a tire that I know isn't a great performer. Of course, this also depends on what your priorities are for tires. I value performance and grip over comfort and long life.





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