Milling new hubs

DIY Builds
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Been reading about pneumatics and such and am planning to mill some hubs on my CNC as the urethane is nice, but the roads and such aren’t good enough to make riding enjoyable. Too many rough spots.

We’re mostly street riding and don’t plan on being off road much / if at all. The 6” seems like the way to go but most of the posts I see, folks are using 8” tires. I’m not too concerned about reduced range - we haven’t pushed the range limits. Most rides are under a few miles.

I guess what confuses me is some hubs say they can support 6.3” and up to 8” tires… then some are very specific and don’t indicate supporting a “range” … is there a sweet spot for the hub diameter and width? I have to use at least 10mm ID bearings and I’ve noticed some hubs support bearings larger than 22 mm OD bearings.

Since I’m starting with a blank piece of aluminum I can use whatever bearings are best. I’ll be using steel bearings as my experience with ceramic was pretty bad. So there are a ton of bearing options available. Wondering if the larger bearings make a noticeable difference? I’ve noticed some use angular contact bearings?

Any suggestions are appreciated. Thanks

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I’d use 28mm OD bearings… They are cheap and plentiful, and will hold up better on a skateboard.

In fact, I’d never heard of 22mm OD bearings in skate wheels until I started looking into electric boards…

Edit: in mtb wheels, not skate wheels

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If you use 10mm or 12mm shafts go with 28mm bearing seats, if you use 8mm shafts go with 22mm bearing seats

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All standard MTB hubs for 8" tires are 3.75" hubs with inner hub diameter of 96mm. The “range” is always the same, those hubs can fit 6"+7" (Evolve) or 6.5" Trampa or any 8" tire on the market. The diameter of the hole of the tire is 96mm as well. Usually 6" tires need a smaller hub but not Evolve.

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