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#1746541 - 01/18/10 12:00 AM tire heat cycling for street use?
friendly_jacek Offline


Registered: 05/04/03
Posts: 5225
Loc: southeast US
Most racing tires has to be heat cycled before a race to prevent accelerated wear.
Does anyone heat cycle regular street tires to prolong tread life?

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#1746569 - 01/18/10 12:58 AM Re: tire heat cycling for street use? [Re: friendly_jacek]
y_p_w Offline


Registered: 05/06/05
Posts: 2313
Loc: SF Bay Area
Heat cycling normal passenger tires? It seems rather extreme. I thought that was primarily used for competition tires that are operated at high temperatures and that typically live short lives.

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#1746626 - 01/18/10 05:32 AM Re: tire heat cycling for street use? [Re: y_p_w]
willix Offline


Registered: 12/16/09
Posts: 1889
Loc: minneapolis mn
Passenger tires are heat cycled every time you turn the key.


Edited by willix (01/18/10 05:32 AM)
_________________________
96 Eldo, M1 5W30 EP
2010 Fusion SEL 2.5L M1 5w20 EP

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#1746631 - 01/18/10 05:41 AM Re: tire heat cycling for street use? [Re: willix]
CapriRacer Offline


Registered: 02/22/03
Posts: 2472
Loc: Somewhere in the US
I think you'll find that the reason racing tires are heat cycled is to get rid of the gaseous components in the compound that is generated by the heat. If you do that as a separate step, then the "gassing off" takes plce while the tire is idle - as opposed to a race condition where the gassing off would interfere with the grip.

No need to do that for passenger car tires. Not only shouldn't they be heated up that much, but the components in tread compounds are designed for longevity, so all you'll do is burn off all the anti-oxidants and waxes that protect the tire from attack by the air. This is not a problem for race tires where their life is measured in terms of laps.
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CapriRacer

Visit my web site: www.BarrysTireTech.com

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#1746741 - 01/18/10 08:28 AM Re: tire heat cycling for street use? [Re: CapriRacer]
Solo2driver Offline


Registered: 07/06/04
Posts: 1385
Loc: Houston, TX
No. Most racing tires only need to be heat cycled initially once or twice before they get in their sweet spot, and then every cycle after that performance degrades. Street tires do not require this action and have much harder compounds anyway. They'll heat cycle themselves out over a few years and get rock hard on their own, why would you want to help them out with that? haha.

In my experience, heat-cycling tires before you race on them does not prolong life, only gets them to their sweet spot quicker.

-James
11 year SCCA racer and former National Champion.
_________________________
2012 Subaru WRX AWD: RP HPS 5w-30 8K mi
2011 Mazda 2 Sport: RP XPR 0w-20 5K mi
2003 Ford Escape V6 4WD: PHM 5w-20 165K mi


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#1746943 - 01/18/10 11:53 AM Re: tire heat cycling for street use? [Re: willix]
friendly_jacek Offline


Registered: 05/04/03
Posts: 5225
Loc: southeast US
Originally Posted By: willix
Passenger tires are heat cycled every time you turn the key.


Not so. Typical driving heats tires to 120F or so. Heat cycling calls for tires to reach over 160F. They become "greasy" in such circumstances.

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#1746948 - 01/18/10 11:57 AM Re: tire heat cycling for street use? [Re: Solo2driver]
friendly_jacek Offline


Registered: 05/04/03
Posts: 5225
Loc: southeast US
Originally Posted By: Solo2driver
They'll heat cycle themselves out over a few years and get rock hard on their own, why would you want to help them out with that? haha.


I've never done it myself. I've heard that from a guy who heat cycled yokohama tires and has 50% tread left at 60,000 miles. This is a tire that typically lasts 40-50,000 miles.

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#1749286 - 01/20/10 11:49 AM Re: tire heat cycling for street use? [Re: Solo2driver]
dailydriver Offline


Registered: 03/14/06
Posts: 6936
Loc: Bucks County, Pa.
Originally Posted By: Solo2driver
No. Most racing tires only need to be heat cycled initially once or twice before they get in their sweet spot, and then every cycle after that performance degrades. Street tires do not require this action and have much harder compounds anyway. They'll heat cycle themselves out over a few years and get rock hard on their own, why would you want to help them out with that? haha.

In my experience, heat-cycling tires before you race on them does not prolong life, only gets them to their sweet spot quicker.

-James
11 year SCCA racer and former National Champion.



AGREED!

But what about a 'DOT' type, semi-race compound, 100 treadwear tire like the Toyo 888, or Nitto NT-01 that someone wants to use on the street, in the spring/summer?? (I am NOT talking about the full race DOT stuff like the Hoosier A/R6es, Kumho V710s, etc.)
Would you, or would you not heat cycle those before street use?
_________________________
2000 Z28 1SC 6 speed 170K miles
Red Line 0W-40/Sustina 0W-20 (80/20 mix)
Amsoil EaO 64 filter
Synpower 75W-140/4oz. XL-3
Ravenol MTF-2

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#1750141 - 01/21/10 06:38 AM Re: tire heat cycling for street use? [Re: dailydriver]
Solo2driver Offline


Registered: 07/06/04
Posts: 1385
Loc: Houston, TX
I would not heat cycle a harder R-compound tire like the Toyo or Nitto...just drive on them. I daily drove an RX-7 with Yokohama A032R's for a few years, no problems. They will still get hard(er), but those tires are kind of dual-purpose.

PS-- I like the NT01...you can really overdrive those things and they are forgiving. Won a ProSolo in 2008 on them, and threw the tires in the garage. National Tour the following spring, won again. Sure they were junk, but I didn't have to worry about cording/overheating an expensive tire.
_________________________
2012 Subaru WRX AWD: RP HPS 5w-30 8K mi
2011 Mazda 2 Sport: RP XPR 0w-20 5K mi
2003 Ford Escape V6 4WD: PHM 5w-20 165K mi


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#1750559 - 01/21/10 12:54 PM Re: tire heat cycling for street use? [Re: Solo2driver]
willix Offline


Registered: 12/16/09
Posts: 1889
Loc: minneapolis mn
A few years back Bridgestone/Firestone performance & ultra performance rated tires sold tires with claimed UOTG(I think) technology that claim the compound will stay softer though out the end of the treadwear life.
_________________________
96 Eldo, M1 5W30 EP
2010 Fusion SEL 2.5L M1 5w20 EP

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#1750792 - 01/21/10 04:16 PM Re: tire heat cycling for street use? [Re: Solo2driver]
dailydriver Offline


Registered: 03/14/06
Posts: 6936
Loc: Bucks County, Pa.
Originally Posted By: Solo2driver
PS-- I like the NT01...you can really overdrive those things and they are forgiving. Won a ProSolo in 2008 on them, and threw the tires in the garage. National Tour the following spring, won again. Sure they were junk, but I didn't have to worry about cording/overheating an expensive tire.


So they did not get "greasy" when hot, like so many of the 100 treadwear class of DOT 'race' compound tires (including, if I remember correctly, the 555R2s)??

You were not running in the Street Modified, Street Touring, or Street Touring S classes right? (Since they require at least 140 treadwear donuts.)
_________________________
2000 Z28 1SC 6 speed 170K miles
Red Line 0W-40/Sustina 0W-20 (80/20 mix)
Amsoil EaO 64 filter
Synpower 75W-140/4oz. XL-3
Ravenol MTF-2

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#1751746 - 01/22/10 02:38 PM Re: tire heat cycling for street use? [Re: willix]
y_p_w Offline


Registered: 05/06/05
Posts: 2313
Loc: SF Bay Area
Originally Posted By: willix
A few years back Bridgestone/Firestone performance & ultra performance rated tires sold tires with claimed UOTG(I think) technology that claim the compound will stay softer though out the end of the treadwear life.

I've heard of some tires that were marketed as having a gradually changing tread compound that became softer as the tread wore down. The supposed benefit was that as the compound hardened with age, the tread would be acceptably soft - although harder than when new. Of course this would be heavily dependent on how long it's been in service and the driver's style. I would think that for really aggressive drivers who wear down their tires quickly, the result could be that once the tread wore down into the softer compound, they started wearing down quickly to the wear bars.

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