I am looking to make some small wheel rims (about 6-8 inches). I know there are currently rims made of aluminum and magnesium. I know steel would work, but what would be some light weight alternatives. I know of titanium, carbon steel maybe?, steel. I am looking for the strongest, lightest, and cheapest material that can be cnc machined. This is for a motor scooter, 62 cc's capable of 50+mph utilizing 10 inch pneumatic tires. It has two ball bearings that fit on the end and the axle is magnesium i think.