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Old 01-18-2011, 11:45 AM   #11 (permalink)
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Standards for Donut Spares

A couple of thoughts:

Donut spares are designed to go 50 miles at 50 mph. That does 2 things:

If you are familiar with the fatigue of materials, the number of cycles to failure can be described by the S-N curve for that material. All structural materials - including rubber - have similar S-N curves in that the more cycles that material has to endure, the stronger the part has to be. Put a different way, if a tire is designed to go 50 miles, it can be built to a lower strength level than a tire built to go 50,000 miles.

Ref: http://en.wikipedia.org/wiki/Fatigue_(material)

Also, the higher the speed capability, the higher the strength of the tire has to be. 50 mph tires are built weaker than 112 mph tires.

The net effect is that the government standards for Donut spares is quite a bit lower than for normal tires. There are no wear requirements. There are no traction requirements.

Donut spares are also manufactured to lower quality standards, since everyone in manufacturing knows what their intended purpose is.

Overall, using Donut spares for purposes other than what they were intended for involves some risks that normal tires do not have.

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Old 01-18-2011, 01:07 PM   #12 (permalink)
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Yer just asking fer the attention of the police...cause we all know they like donuts!







*this was meant as a joke...please don't take it seriously or the joke police will be all over you, too!
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Old 01-18-2011, 01:57 PM   #13 (permalink)
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Quote:
Originally Posted by BamZipPow View Post
Yer just asking fer the attention of the police...cause we all know they like donuts!

*this was meant as a joke...please don't take it seriously or the joke police will be all over you, too!
Who Me...???





>
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Old 01-25-2011, 06:08 PM   #14 (permalink)
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I've seen a couple people at the track running them on the front of their cars (trapping 100+.) Really dumb
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Old 01-25-2011, 10:50 PM   #15 (permalink)
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you got a good life insurance policy? if so does your underwriter know you are doing stuff this dumb?

donuts=temporary

just enough to get you to a place for your real tire to get fixed...

nothing more.

please don't try this
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Old 01-25-2011, 11:01 PM   #16 (permalink)
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Quote:
Originally Posted by CapriRacer View Post
Overall, using Donut spares for purposes other than what they were intended for involves some risks that normal tires do not have.
Another reason that donut spares are not recommended for long-term use is because if you put a donut on a drive wheel and use it for long periods of time, you'll prematurely wear out your differential.
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Old 02-06-2011, 12:23 PM   #17 (permalink)
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the guy in the video put the donuts on the back, not affecting the odometer at all, as long as the donuts are on the non drive wheels and you dont have abs or a car with stability control or traction control you will be fine
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Old 02-07-2011, 02:41 AM   #18 (permalink)
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wow...you really said......

Quote:
Originally Posted by glhman222 View Post
the guy in the video put the donuts on the back, not affecting the odometer at all, as long as the donuts are on the non drive wheels and you dont have abs or a car with stability control or traction control you will be fine
Would you mind setting up your credentials first??????
Oh, and your big fat bank account number.

But thank goodness the odometer is ok.....man that was the BIG worry. And thanks for reassuring him that he 'will be fine'!!!!!!!!!

Did you even read the previous posts?

maybe just read what capriRacer said.....he's kinda a tire expert....

I am just STUNNED at the stupidity of the statement 'you will be fine'!
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Old 02-07-2011, 05:25 AM   #19 (permalink)
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Quote:
Originally Posted by glhman222 View Post
the guy in the video put the donuts on the back, not affecting the odometer at all, as long as the donuts are on the non drive wheels and you dont have abs or a car with stability control or traction control you will be fine
Tyre manufacturers like Michelin, advise their customers to put the best tyres on the rear of a car.

The reasoning being that people will more easily adapt to understeer than cope with massive oversteer once the rear tyres lose it.
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Old 02-07-2011, 10:56 AM   #20 (permalink)
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We've had the good tires on front/back debate and even though I know full well the insurance/tire companies recommend the good ones on the back, I prefer the good ones on the front because where I live I need traction for starting, stopping, and steering first and foremost, and having had several vehicles with rear weight bias, I'm equipped to handle any oversteer that *may or may not* occur. The thing about some official recommendations is that they have to work for the lowest common denominator- a Cover Your *** sorta thing.

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