Alum rim's, but those are heavy. 23 mm hub's are very good, when combined with the velocity dish rim's and bowties tire's it's a very light weight tire combo. Take's some reall effort to destroy those.
If you decide to go for the 23 mm hub's, get the dace one's. No need for a expensive wrench, unlike the proline's.
The 23 mm hes is strong enought to bend an aluminum knuckle on my maxx. It never hurt the wheel. I got a set of dace a while back. ( few weeks ago) They come and go.
Peace!
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