You can run pretty much any front gear you want. No clearance issues. The rear gear might be an issue depending on what chassis you are running. If you are running anything over a 70 tooth, you might have lack of clearance at the chassis cross bar. Especially if it is a 2 cycle chassis. I would ask around about what ratio most people run. Find the gear combo that will allow you to run a rear gear in the low to mid 60t range and you probably won’t have any clearance problems.