Q: What is the optional anti-slip knurling on the UP-04?
It’s a machined texture in the barrel, borrowed from F1 wheel technology, that grips the tire bead to stop it slipping under hard acceleration. On the UP-04 it’s optional and available in 19 and 20 inch applications only. If you launch or track the car, it’s worth adding; for a purely street wheel it’s not essential. It’s your call at order time.
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