#35 Sprocket For Wheel 45 tooth p/n 2299k319 45 Tooth Hardened Wheel sprocket. Recommended for use with 12 tooth shaft sprocket to keep close to four to one factory gear ratio on most models excluding big wheel models and also The Rock/Cobra or Nuke/Lowrider/STANDR, BUT This sprocket will increase TORQUE on models using 3:1 OR 3.16:1 gear ratios, such as THS OR ROCK/COBRA with 9 inch rear tire. This sprocket is recommended with 3.0-4/280x65/10 inch rear tires For even MORE torque, use a 13 tooth shaft sprocket. "Big wheel" models use 60 tooth wheel sprockets.