Hi there i was too wondering about gearing. I am currently running a 5.5R and a standard spur. I have put on a 15 tooth pinion on to give a overall ratio of 11.8746. But when i ran this it started to cut out. It may have been from something else as the speedo was only fairly warm and not hot (I could easily keep my hand on the speedo and the motor). So any advice would be appreciated.