I have a 2017 grom and I want to buy new rims for it. The most common size I see is 12x3 for the front and 12x4 for the rear. I can't find what size the stock ones are. I want to make sure I can use my stock tires and don't have to do anything for the speedometer. If anyone could help me out and let me know the stock rim size I would greatly appreciate it! Thanks and grom on!