I just replaced my stock IRC tires (2011 Ninja) with fresh Perilli Diablo Rosso II front (110-70) and rear (140-70) tires. What a world of difference in wet and dry and performance. It is written, if you reduce the weight of your wheels you will increase performance. The new tires are lighter than stock and you can feel the increase ease in acceleration and handling. The Perillis have a rounder profile than stock, and, well, they make corning so much easier. I don't have to put as much pressure into the bars to corner. I got caught in heavy rain, the tires felt strongly planted, no slipping. So if you're thinking new tires, I'm really impressed with the new feel and performance from just adding these tires. Don't forget to static balance for a smooth ride.