Their demo car uses Pilot Sport Cup 2 tires, which are also used on the Buggati Chiron and Koenigsegg Agera RS (which recently set two records for fastest 0-400kph-0 and fastest production car road speed). These tires are street legal.
The Roadster is significantly faster than other supercars from 0-60 on the same tires, so the advantage must come from much more efficient anti-wheel slipping from the three electric motors coupled to AWD. This dramatic speed advantage is probably a result of the ability to quickly alter the power output per wheel to minimize efficiency losses from breaking traction.
FWIW, all of the hypercars on the market have custom compounds, so the fact they're both called "Pilot Sport Cup 2" by Michelin doesn't really matter all too much.
The Roadster is significantly faster than other supercars from 0-60 on the same tires, so the advantage must come from much more efficient anti-wheel slipping from the three electric motors coupled to AWD. This dramatic speed advantage is probably a result of the ability to quickly alter the power output per wheel to minimize efficiency losses from breaking traction.