Wet-weather braking and snow traction also decrease as tires wear. Tires are considered bald when one or more of their grooves reaches 2/32 of an inch deep, compared with about 10/32 of an inch ...

you may want to have the tires rotated before it’s called for if you notice uneven tread wear that results in vibration or noise. Related: How to Check Tire Tread Tire rotation is necessary ...