Four new tires

Do I Need to Change All Four Tires at the Same Time?
August 11, 2015 – 01:29 pm
Tires6

Deciding how many tires to replace can be downright mathematical. Haynes says it depends on several factors, including the vehicle’s type.

For all-wheel and front-wheel drive vehicles, he says all four tires must have the same tread design and be of the same make and model.

“Different tread patterns and compounds deliver different levels of traction, ” Haynes says. “On these vehicles equipped with a differential, the variation of tread will overwork the differential and drivetrain and can cause serious damage.”

An important note to consider, Haynes says, is that if you only switch out two tires, all four tires should still have tread depths within 4/32 inches of each other.

“Tires with different tread depths will rotate at different RPMs, ” he says. “A differential works to distribute power to wheels that are slipping, and the difference in RPMs can cause the differential to think this is happening.”

For example, Haynes says is if a customer comes in with front tires with a tread depth at 8/32 of an inch and rear tires at 3/32-inch depth, he would recommend replacing two tires. This is because leaving the front tires with a tread of 8/32 on and putting new tires on with a tread of 11/32 would create a 3/32 variation, which he says is acceptable.

“If the customer had two rear tires at 3/32 and the fronts at 5/32, I will be recommending four new tires, ” he says. “This is because the replacement of the two worst tires will leave us with 5/32 and 11/32. This [difference] is too vast and can risk differential damage.”

Source: www.angieslist.com
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