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Kirkham Motorsports

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  #1 (permalink)  
Old 02-19-2012, 07:57 AM
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Hey John /Silverback,
I think your's is the first post I have ever read of an Avon user ever going back to something else. Fill me in. Thanks.
Steve
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Old 02-19-2012, 08:22 AM
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I think the rating of 118 mph is "118 mph for one hour". Most of us don't drive that fast for an hour.

Dwight
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Old 02-19-2012, 09:14 AM
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I think the rating of 118 mph is "118 mph for one hour". Most of us don't drive that fast for an hour.

Dwight
That rating is also at 100% of the rated load capacity. Depending on the tire, some of them could support the entire weight of a Cobra.
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Old 02-19-2012, 09:29 AM
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Why dissatisfied with the Avons and switching back to G'Years?
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Originally Posted by SPF1061 View Post
Hey John /Silverback,
I think your's is the first post I have ever read of an Avon user ever going back to something else. Fill me in. Thanks.
Steve
Avons are great tires, and are without a doubt the best DOT rated 15 inch radial tire available for a Cobra bar none. So I'm not dissatisfied with them.

I have three reasons for going back to the GY's.

First is I prefer the looks.

Second is the feel as you approach the limits. The GY's are a little more forgiving. And don't get me wrong. The Avons are pretty good also, it's just that the GY's are a little better in my opinion.

Third is probably the biggest reason. There is a 45 pound difference in weight between a full set of GY's and Avons. That's a boat load of unsprung mass you can save just by going with the GY's.

The front tires save 12.5 pounds each. 17.0 vs 29.5. And the rears save 10 pounds each. 21.0 vs 31.0.

Since my wife and daughter both refuse to even drive the Cobra, I do not have to worry about them being surprised with the twitchy aspect of the GY's. Me? I'm used to them and it does not bother me.

I suppose I should add that I try to put 4000 to 7000 miles a year on my car, so it's not a garage queen or show car. The tires get used up in about 2 seasons of driving.

Hope that answers your questions.
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Old 02-19-2012, 10:57 AM
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Third is probably the biggest reason. There is a 45 pound difference in weight between a full set of GY's and Avons. That's a boat load of unsprung mass you can save just by going with the GY's.

The front tires save 12.5 pounds each. 17.0 vs 29.5. And the rears save 10 pounds each. 21.0 vs 31.0.
Thanks for a comprehensive answer. I agree about the weights. With my mags, the combined tire/wheels weigh 35 front, 42 rear. The wheels are 18 and 21 alone.
Not a factor street Avon users care about but significant on the track for controllability.
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Old 02-19-2012, 05:18 PM
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Hope that answers your questions.
Yes, and good answers to boot. The weight is especially significant if doing serious tracking. I drive my Cobra, too. 62,000 miles in a bit over 10 years so far. I do a lot of open track events, but I don't want to fool with a separate set of wheels and tires for track use. The Avons just can't be beat for street and track use. They are expensive. I'll be looking at set number four pretty soon.
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Old 02-20-2012, 09:09 PM
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Fatboy,

To answer your question about the 118 mpg rating of the Mickey S/T tires, I am getting older and the "Need for Speed" has diminished. When you get over 60, it's more of a fight with what you can do and what hurts too much. I play tennis at least one a week and work out to stay in shape so that I can drive the Cobra on 12 hour events. However, these events do not require high speeds and can be run at legal speed limits. Driving a Cobra at over 100 requires a lot of focus and is physically draining. So, I keep the speed down and focus on winning events with precise timing. We have a big rally coming up on March 17 from Riverside to Palm Springs. If you really want to have some fun with your car, join us. The rules have been changed to make the course very easy for beginners. See the information here: ITNRALLY.ORG.

RS
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Old 02-21-2012, 12:56 AM
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Rallysnake,

Thank you very much for the invite and I would dearly love to take you up on it. However, as I live in England, I'm unlikely to have the opportunity I'm afraid.

Although I have done a couple of track days where the speeds can get pretty high, my question was less about the reality of high speeds and more about the "suitability" of the tyres for a Cobra as viewed by an insurance company in the unfortunate event of having to make a claim.

Thanks again.

Paul
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Old 03-23-2014, 05:40 PM
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Just a quick update. I have been rebuilding the top end of my engine and rewiring the car since December. It's easy to inspect the tires from under the car. The Mickey S/T tires are wearing very evenly and the rears are about 1/2 tread. I probably have 20K miles on them and did not expect them to last so long.

During the Stardust rally in November, we ran from Palmdale to Las Vegas and spent more than 12 hours in the car. There was one occasion where we pushed the speed a little to get to a checkpoint in time, but mostly it was back road cruising. My Navigator is over 60 and has a heart condition so I take it pretty easy.

After driving all night, I was getting a little tired and wanted to raise the excitement level a little. On one tight negative camber right hand turn in south Las Vegas, I pushed the accelerator a little harder through the curve and was surprised that the rear end slid out. It was easy to catch and I expected that the right rear tire had lost some pressure. I got out to check it at the next checkpoint. The tire was fine and the problem remained a mystery until I got home and slid under the front of the car to pull the oil pan. That's when I saw the right hand sway bar bracket was broken in half and bent wide open. It had scraped over too many parking barriers, I guess.

The point is that these are great tires and I highly recommend them.
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