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Unread 04-15-2013, 10:04 AM   #1
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Default Worn Tires /New Tires Replacements.

Hello everyone,

I have a Mercedes-Benz C180 (W202) which I think is RWD car.Recently,I had a small accident and my back left tire (as you look the car from the back) was flat so I had to change it.So before I start the replacement process I was wondering where to put the spare tire.I was wondering if it was better to replace the the flat tire with the spare one or if it is better to unscrew one of the front tires and place it to the back,where the flat tire was and put the new one to the front.So I chose to do the first.I did a little Internet research and I got more confused because people seem to argue about this specific topic as well.Some say it depends to the suggestion of tire manufacturer,others say that it is better to put new tires on the back because the it is easier to lose control if the rear tires are in a bad condition,others say that it doesn't matter what kind of car you have you must always choose to change the front tires because that way you gain more control when you turn,etc....(many other opinions)

So I was wondering which is the correct answer to that question for each type of car (RWD,FWD,4WD)

Thanks for your time.

Kind Regards,

P.S.:I searched the forum from the search bar,but I couldn't find any similar threads.I am sotty in advance if there is already one

P.S.2.:I know nothing about cars,so please explain as simple as possible.

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Unread 04-15-2013, 01:30 PM   #2
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If you have an LSD (limited slip differential), you should have the same tires on the driven wheels. For example, if you have a RWD car with an LSD and you get a rear flat, you should put the same side front tire on the rear and the compact spare on the front. This is because having 2 different sized tires will wear out the LSD. The differential will be fine, but you'll wear out the effectiveness of the limited slip.

If you have an open differential (most cars), it's actually probably better to put the compact spare on the rear, as it's more important to have control over your steering, and most of your braking is done by the front wheels.

However, on a compact spare you should always drive carefully and never exceed the maximum speed that's stated on the tire. If it's an emergency it shouldn't really matter what wheel you put it on, just drive carefully and you won't lose control.

In your case, you have a RWD car that doesn't have an LSD, so I would put the spare on the rear tires. But just remember to get a proper tire as soon as possible, as compact spares are emergency use only. If the tire that was flat cannot be repaired, you must buy at least 2 matching tires, and put them on the same axle.
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Unread 04-15-2013, 03:35 PM   #3
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Quote:
Originally Posted by MetalBeerSolid View Post
If you have an LSD (limited slip differential), you should have the same tires on the driven wheels. For example, if you have a RWD car with an LSD and you get a rear flat, you should put the same side front tire on the rear and the compact spare on the front. This is because having 2 different sized tires will wear out the LSD. The differential will be fine, but you'll wear out the effectiveness of the limited slip.

If you have an open differential (most cars), it's actually probably better to put the compact spare on the rear, as it's more important to have control over your steering, and most of your braking is done by the front wheels.

However, on a compact spare you should always drive carefully and never exceed the maximum speed that's stated on the tire. If it's an emergency it shouldn't really matter what wheel you put it on, just drive carefully and you won't lose control.

In your case, you have a RWD car that doesn't have an LSD, so I would put the spare on the rear tires. But just remember to get a proper tire as soon as possible, as compact spares are emergency use only. If the tire that was flat cannot be repaired, you must buy at least 2 matching tires, and put them on the same axle.
Thanks for your reply.
I have many questions though!

1)What is LSD?I looked it up on the Internet but I wasn't able to understand much.

2)How do I know if the spare tire is "compact" or not?It seems to be the same thing like the normal tires as it is the same size.The only difference is that it has different rim compared to other and it has written the number "90" which I guess is the speed limit.Yes,I know what you might think that if it says speed limit then it should be different compared to the normal ones.But I was wondering what are differences in terms of technical specifications of the compact tire.

3)If I put the spare tire on the back as you suggest,being a RWD the car,wouldn't that make it less controllable?Because the car is RWD so all the torque will be transfered to the rear tires first to move the rest of the car.Is this right or am I thinking it wrong?

4)How do you know if the car has LSD or not?

Last edited by fasdf78; 04-16-2013 at 04:19 AM.

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Unread 04-15-2013, 06:25 PM   #4
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Hamco is always provides special care with brand tires replacement..

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Unread 04-15-2013, 06:29 PM   #5
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Doesn't matter if it has an LSD or not. The difference is negligible.

If it looks the same size as the others it's not a compact.

How long has the spare been in there? If it's original, on a car that age I wouldn't trust it for long.

How much life is left on your tires? If you don't have a lot of life left on your tires, and you know the spare is fairly new, I'd leave the spare on (for short term, placement won't matter) and soon when you get new tires, have them mount all four new and retire your spare again.
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Unread 04-16-2013, 04:18 AM   #6
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Quote:
Originally Posted by Mike View Post
Doesn't matter if it has an LSD or not. The difference is negligible.

If it looks the same size as the others it's not a compact.

How long has the spare been in there? If it's original, on a car that age I wouldn't trust it for long.

How much life is left on your tires? If you don't have a lot of life left on your tires, and you know the spare is fairly new, I'd leave the spare on (for short term, placement won't matter) and soon when you get new tires, have them mount all four new and retire your spare again.
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Doesn't matter if it has an LSD or not. The difference is negligible.
There we go again.
This is what happens in every single forum where there is a discussion about the same thing.Someone says it's that and there is another one who says it's not.

Anyway,I do not know how much life has left in my tires.I wasn't counting the miles from the time I first put them in the car.

The spare tire is as old as my current set of tires.Which I think it's not more than 4-5 years old.I have to say though that me and my family are not using the car regurarly.So tires haven't done so many miles in the aforementioned amount of time.

Thanks for your response Mike.

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Unread 04-16-2013, 08:55 PM   #7
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if it's 4 wheel drive or awd then never use tires with more then a 3/32nd difference. Anything else doesn't matter. LSD will not make a difference. Refering to your owners manual regarding manufacturer specific tire replacement will always answer any vehicle specific questions.
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