ARC Rear Hub 3/4"
Precision machined from 6061 T-6 aluminum, these hubs are designed for increased strength and are also available for either 1" or 1-1/4" axles. All models have dual patterns for 1/4-28 and 5/16-24 lug bolts on a 3 x 2.5" bolt circle.
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The scooter transaxle is 17mm dia, so I also had to buy a reducer bushing to fit this hub to the axle - including a "stepkey" that has 5mm one side, 3/16" on other and is 40 mils taller because of the diameter delta. I bought 13 inch wheel+tire from Harbor Freight and used 1 3/4" hole saw to cut the hub out of the wheel, and installed this hub instead. Had to trim some points on the scooter to fit the 75% larger rear wheels, but the ride is much smoother and the thing gets to 7 mph rather than 4 mph.