No, stock spur is 100T. I'm running a Kimbrough 76T spur, but find the smallest spur you can put on it. I think they made 64 pitch spurs down to 72T if I'm not mistaken. Pinion, using 55mm diameter tires, try 45-50T depending on size of your track. We race 21.5's blinky here at our track. Plenty fast for the size of these cars.