What Does 103Y Mean On A Tire - 30 rows a tire’s speed rating indicates the optimal speed that the tire can safely maintain over time. A tire's speed rating, or speed index, is a code that corresponds to the maximum velocity at which the tire can safely operate. In short, it’s the fastest speed a tire.
In short, it’s the fastest speed a tire. 30 rows a tire’s speed rating indicates the optimal speed that the tire can safely maintain over time. A tire's speed rating, or speed index, is a code that corresponds to the maximum velocity at which the tire can safely operate.