Other information:
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Using tires and wheel other than the recommended sizes could
cause unusual handling characteristics and poor vehicle control,
resulting in a serious accident.
...
Reduce speed and shift to a lower gear before you start down a long or steep
downgrade. If you don’t shift down, you might have to use your brakes so much that
they would get hot and no longer operate efficiently.
On a long uphill grade, shift down and reduce your speed to around 70 km/h (45
mp ...