There are many Bridgestone Battlax tires. Many also use the word sport in the name.I read some comments on the "Sport" Battleax that were not favorable and asked around. Wheels and some others say to buy the Rear Battleax 45, put it on the front in reverse and it will give lots of mileage. I could be wrong but I think the "Sport" maybe a different model. I feel sure someone will comment back.