Fiat 2015 500e Owner's Manual page 275

Inspect the wheel mounting surface prior to mounting
the tire and remove any corrosion or loose particles.
Wheel Mounting Surface
Tighten the lug nuts/bolts in a star pattern until each
nut/bolt has been tightened twice.
WHAT TO DO IN EMERGENCIES 273
Torque Patterns
After 25 miles (40 km) check the lug nut/bolt torque to be
sure that all the lug nuts/bolts are properly seated
against the wheel.
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