For what it is worth, I just drank a 12 pack so bare with me I ordered a 14 tooth t2 main and a 38 t2 tooth rear sprockets (garenteed for life) and a smart chain from Sidewinder products fit great. Stock chain is seventy. I would add two links for the 38 rear sprocket going with the 70 my adjuster is only at #5 for chain adjustment. I feel that the 38 rear and 14 fornt is between a 14 and 13 front. Since I allready tried a 13 toolth front. Great serviece and fast turn around time. and quality products.