Re: Mixing tire sizes

Posted by Crazy Horse on April 05, 2019 at 09:01:41 from (75.158.37.1):

In Reply to: Re: Mixing tire sizes posted by Leroy on April 05, 2019 at 07:59:05:

Never heard of that Leroy, interesting, I'm sure my Honda's owners manual says something the same. Doing some web searching shows much the same advice, HOWEVER not for the reasons we are discussing here (ie differential or transaxle issues). Here's what most of them have to say .... keeping in mind that this is just someone else's opinion and just because the issue we are talking about isn't mentioned doesn't mean that it's not important.

If you get a flat tire on a front wheel on a front wheel drive vehicle and have to use the small "donut" wheel/tire, move a full-size wheel/tire from the back to the front and use the "donut" on the rear. Don't drive more than a few miles with the donut in the first place. It's only for Emergency use. But if you MUST use it, it's always a good idea to use the donut only on the REAR of your car. There's a couple reasons for that:

- Most cars weigh more in the front, so you'll be putting less stress on it by using it in the back.

- Your braking force comes mostly from the front. The donut tire has very little traction compared to your normal tires. You will not stop as straight or as quickly in an emergency if you have the donut on the front.

- Your front tires are used to turn the car, and a real tire will give you better turning than the donut, especially in an emergency avoidance situation.

- If your car is Front-wheel drive and it's snowy/icy, then all of the above plus you will get better traction for acceleration.

There's a possible exception to this rule: If your car is rear-wheel drive and it's snow/ice covered roads. You may not even be able to get acceleration traction if the donut is on the back - however if you put it on the front, you run into the same issues (1-3) above. But, if you have to get moving, and the only choice is to have the donut on the rear, then I guess that's the only choice you'll have.

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