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Old 03-22-2008, 09:23 PM   #1
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Default Foam tires, why this way?

I notice some people set a softer front tire than the rear (I thought you're suppose to have harder front than rear to avoid oversteer). Is this because the rear tire has a larger contact area so you can have the same /softer front?

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Old 03-22-2008, 10:04 PM   #2
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In some conditions you can run a softer front than the rear. It really helps with even tire wear during a long main
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Old 03-23-2008, 01:43 AM   #3
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On our old track, everyone used to run softer on the rear mostly because we were always looking for rear grip and tire wear wasn't too bad. Now we are at a new location and wear is an issue. The rears wear very fast so most people run same front and rear or I have run softer in the front with pretty good success. At another track I go to, we always run softer in the front because it helps the cars turn alot better and there's tons of traction so the harder rear tires last a long time.
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Old 03-23-2008, 05:41 AM   #4
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But won't you oversteer with a softer front?

Thanks for the clarification.
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Old 03-23-2008, 06:19 AM   #5
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Quote:
Originally Posted by bboy View Post
But won't you oversteer with a softer front?

Thanks for the clarification.
As you well know, tyres are not the only thing you use to set your car up. If you have to use softer fronts and harder rears to account for wear then set your car up accordingly so as not to oversteer.
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Old 03-23-2008, 06:38 AM   #6
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Originally Posted by Sow&Steady View Post
As you well know, tyres are not the only thing you use to set your car up. If you have to use softer fronts and harder rears to account for wear then set your car up accordingly so as not to oversteer.
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Old 03-23-2008, 07:26 AM   #7
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Quote:
Originally Posted by JetMD View Post
On our old track, everyone used to run softer on the rear mostly because we were always looking for rear grip and tire wear wasn't too bad. Now we are at a new location and wear is an issue. The rears wear very fast so most people run same front and rear or I have run softer in the front with pretty good success. At another track I go to, we always run softer in the front because it helps the cars turn alot better and there's tons of traction so the harder rear tires last a long time.

Ditto ( I'm just too lazy to type it) thanks for typing my words
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Old 03-23-2008, 07:41 AM   #8
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So you mean you use a softer front to reduce tire wear? Interesting...
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Old 03-23-2008, 08:05 AM   #9
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Default Tire wear

No the rears wear more so if you run softer fronts you don't lose tire split. I ran 35 shore front and rear and in a 30 minute main would lose 3 mm of split.
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Old 03-23-2008, 12:20 PM   #10
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Hi!

Things are little more complicated. Today cars are design with tire split, more rear traction capable and a lot more stuff to set up. During mains rear tire tends to wear more, and cars are capable to have more rear traction than front, so you can use this advantage to have even tire wear or close to it, that way you car mantain more constant during the race. So basically you can run higher shore tires on the rear to also get more rotation on turns and keep even wear on the 4 tires.
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Old 03-23-2008, 08:33 PM   #11
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Got it, let me try that next time.

Thank you everyone!

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Old 03-24-2008, 03:00 AM   #12
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In regard to nitro tires... Most people don't know that the actual construction and composition of the front and rear tires are diffrent.. The rear tires at least in the jaco lineup are much softer than the fronts.. notice you rarely chunk front tires on a nitro touring car? because they are harder than a similarly numbered rear.... so having a lower number front tire doesn't actually mean the tire is actually softer in the front..

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Old 03-24-2008, 03:50 AM   #13
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Unless the tire is multi stage, the foam is the same, it only change the amount of foam rings it have, chunks on the rear is mostly caused to the traction and also can mean that the car needs more camber on that side. You can measure it with a shore reader and you will confirm it. I have one.
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Old 03-24-2008, 03:53 AM   #14
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Quote:
Originally Posted by Edgar Millenium View Post
Unless the tire is multi stage, the foam is the same, it only change the amount of foam rings it have, chunks on the rear is mostly caused to the traction and also can mean that the car needs more camber on that side.
First, foam front and rear isn't the same... , the construction front to rear is different foam.. call your tire supplier and ask if you don't believe me lol I can't speak for all the mfg's, but this does hold true for ellegi and Jaco.

Second, a durameter doesn't tell you what type of foam it is.. they may read similarly but the actual foam is different. and not just compound...Just like with your durameter you probably couldn't tell the difference between a green, a pink and a white foam tire.. why? they are all in the 30 range.. yet are different compounds right? the durometer just measures the deflection of the foam.. and assigns it a value.. degrees, thousandths of an inch, or what have you. in the end it can't tell you what the compound actually is or its adhesion properties.. different foam, yet reads the same..

Third, if you call the mfg and you don't believe them.. Call over to RC America, Ask for "Ralph", Aka Ralph Burch 2008 Winternats champ, and many time national champion and ask him...

Fourth, If you don't belive him and you think you know more than everyone else.. Try cutting any rear tire you have down to 26mm put it on the front of your car and tell me it doesn't rotate better and explain how the tire thats the same compound made the car free up so much...then tell me its the same compound...

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Old 03-24-2008, 04:04 AM   #15
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Here is a very good explanation of foam tires by Frank Calandra:

http://www.teamcrc.com/crc/modules.p...article&sid=27

Should answer a lot of questions.
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