Q: Can I fit a wider tire than stock on these?
Yes, and it is one of the more effective performance moves you can make. Several UP-04 widths exceed the stock Model S fitment, letting you run a wider tire with a bigger contact patch for more cornering grip and traction under acceleration. That is popular on the Plaid for track days, often wrapped in a grippy summer tire like the Michelin Pilot Sport 4S. If you would rather keep an OEM-plus ride and maximize range, the narrower configurations run near the factory section width.
INSTALLATION guide