Join Date: Jan 2005
Location: North Jersey
Motorcycle: 2005 GSXR-1000 (track), 2006 GSXR-600 (track/race)
Re: Blue tires
Tyre Discolouration – Blue Tyres
Motorcycle Blue Tyres
You often see the question come up ‘why are my tyres blue’ or ‘what’s this blue stuff on my tyres’ with people suggesting that when you see it the tyres are done. This isn’t completely true.
What makes it blue? – Motorcycle tyres actually contain oils that keep the tyre soft and the blue/green tint you can see on your tyres is just the oils coming to the surface.
Why are they on the surface? – After the tyres have been used to the point where they gain significant heat, when they cool down again (this is one heat cycle) the oils in the tyre will often come to the surface. When you go back out and ride the bike these surface oils are scrubbed off and it’s only when you come back in and let the tyres cool down again that you’ll see more oils coming to the surface.
Each time you take a tyre through a heat cycle you are losing the oils that keep the tyre soft, so the more heat cycles a tyre has been through the less effective the rubber is going to be for you.
As a side note, heat cycles will affect track tyres a lot worse than road biased tyres, as road tyres are expected to go through these cycles.
"I never drive faster than I can see...besides that it's all in the reflexes."
CCS AM #478