What rear sprocket should I get with a 17 tooth front. I have the piranaha 140cc engine and a 12" rear wheel. I will mainly be riding it on smaller style mx tracks and just play riding at home. I will be using a kx 65 rear wheel that a 44 tooth is the smallest I can find. This seems to be really steep gearing. I had a member tell me of a custom place I can get them made and looks like I can go down to a 37. Let me know what works thanks. I was thinking 17/37 or 17/38.