FORD 2012 Focus Electric - Manual (Page 244)

SNOW TIRES
WARNING: Snow tires must be the same size, load index, speed
rating as those originally provided by Ford. Use of any tire or
wheel not recommended by Ford can affect the safety and performance
of your vehicle, which could result in an increased risk of loss of vehicle
control, vehicle rollover, personal injury and death. Additionally, the use
of non-recommended tires and wheels could cause steering, suspension,
axle or transfer case/power transfer unit failure.
Snow chaines have not been approved for use on your vehicle.
SUMMER TIRES (IF EQUIPPED)
Summer tires provide superior performance on wet and dry roads. Summer
tires do not have the Mud and Snow (M+S or M/S) tire traction rating on
the tire side wall. Since summer tires do not have the same traction
performance as All-season or Snow tires, Ford does not recommend using
summer tires when temperatures drop to approximately 40°F (5°C) or
below (depending on tire wear and environmental conditions) or in snow/ice
conditions. Like any tire, summer tire performance is affected by tire wear
and environmental conditions. If you must drive in those conditions, Ford
recommends using Mud and Snow (M+S, M/S), All-season or Snow tires.
244 Tires, Wheels and Loading
2012 Focus Electric Vehicle (fob)
Owners Guide gf, 1st Printing
USA (fus)