The UniSA prototype car used 14x5J 45 alloy wheels from a Suzuki Cappuccino, with 165/65R14 Michelin Energy tyres (the last three in Australia). The combined mass of a wheel and tyre was 10.6 kg.
The Team Trev version used the same size front wheels, from a Can-Am Spyder, with the same tyres that were used to drive from Darwin to Adelaide . Wear is minimal after travelling over 30000 km.
Team Trev used a motorcycle tyre on the Vectrix rear-end, but only because they could not find a car tyre that would fit between the forks. (This is not quite true. They found one in Russia, but it exploded while it was being installed.) Motorcycle tyres are not designed to handle large side loads. Rolling resistance is unknown, and we suspect poor.
Trev does not necessarily need wheels and tyres designed for 1–2 tonne vehicles.
The (incomplete) table below indicates candidate tyres that are narrow and are claimed to have low rolling resistance:
|Michelin XM1+||175/65R14 82H|
|Hankook enfren||17 sizes, but smallest appears to be 195/60R15|
|Pirelli P6000 Powergy||185/60R14 82H|
Michelin still make 125 x 15 and 135 x 15 tyres for 2CVs, using their low-energy silica compound.
The European Audi A2 1.2 TDI uses Bridgestone 145/80R14 tyres on magnesium wheels (thanks Ed!).
Bridgestone Australia have a B340 145/65R15 tyre.
Trev did not carry a spare tyre from Darwin to Adelaide. Team Trev carried a spare rear motorcycle tyre around the world with them, but did not use it. Carry a can of tyre repair goo instead.