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Tire Surface Bluing


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I'm wondering if anyone here has experience with this. The edges of a set of Pirelli SuperCorsa's that I had run on my Ducati 748 track day bike started to turn blue. Both the front and rear tires had this blue haze on them. I've been told to just run them up to temperature gently and the discoloration will scrub off without any detrimental effect on tire performance and I've also been turned away at tech at a track day because the bluing was indicative of some of the rubber compound's petrolium based components being overheated and boiling off. I did change them for the track day but, I would still like a staright answer about the cause and effect. I was running 30 PSi in both tires at the time and the bike's suspension was stock.

Thanks

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I'm wondering if anyone here has experience with this. The edges of a set of Pirelli SuperCorsa's that I had run on my Ducati 748 track day bike started to turn blue. Both the front and rear tires had this blue haze on them. I've been told to just run them up to temperature gently and the discoloration will scrub off without any detrimental effect on tire performance and I've also been turned away at tech at a track day because the bluing was indicative of some of the rubber compound's petrolium based components being overheated and boiling off. I did change them for the track day but, I would still like a staright answer about the cause and effect. I was running 30 PSi in both tires at the time and the bike's suspension was stock.

Glenn,

 

I've been running Pirelli Diablo Supercorsa's for the last couple of seasons. The bluing is quite normal for the Supercorsa's and all other tires I've abused hard enough on the track - and yes, it's the additives that are getting heated up and start to "leak".

 

As for the tech inspection to turn you away due to the bluing makes me wonder if they've got rocks in their heads - as long as you've got a decent thread depth, the tires should be good.

 

Since this is in no way unique to the Pirelli's, maybe Steve can weigh in here?

 

 

Kai

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I'm wondering if anyone here has experience with this.

That's a good question, I was wondering the same thing. Just yesterday I was looking at my Dunlop Sportmax Qualifiers (as I was loading it on the trailer to take it and get new stiffer springs in the front to replace the soft stock ones, yeah!) and my edges are blue too, so the effect isn't just with Pirellis.

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I'm wondering if anyone here has experience with this. The edges of a set of Pirelli SuperCorsa's that I had run on my Ducati 748 track day bike started to turn blue. Both the front and rear tires had this blue haze on them. I've been told to just run them up to temperature gently and the discoloration will scrub off without any detrimental effect on tire performance and I've also been turned away at tech at a track day because the bluing was indicative of some of the rubber compound's petrolium based components being overheated and boiling off. I did change them for the track day but, I would still like a staright answer about the cause and effect. I was running 30 PSi in both tires at the time and the bike's suspension was stock.

Thanks

 

Bluing on rubber surface.

 

The oils in the compound of the tire are simply flowing out of the tire. This action will happen regardless if it turns blue or not. It is always happening to some degree. Heat accelerates this process.

 

The blue is not good or bad. Bluing is not a requirement, or unwanted. It just is.

 

If the tire is made with more carbon and less oil, there might be less bluing possible. On the other hand if there is more oil and less carbon in the tire, you may see more bluing. Tires made with more oils have a higher potential for grip.

 

Another Myth bites the dust! Thanks for the assist Kai.

 

If you had someone at tech turn you away, I would have to say that was not correct if the blue on the tire was the ONLY reason given.

 

Congrats Glenn! You made it on the pinned sticky: http://forums.superbikeschool.com/index.php?showtopic=2587&view=findpost&p=21033

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