"Cold Tire" crashes on the street

[Degsy]

Wirelessly posted

I had a Volkswagen variant fastback years ago. The windshield washer was run by air from the spare tire.

[OreoGaborio]

Pretty sure that joke lost it's funny a long time ago.

Nope. Still funny

[Tunertype]

Cold tire crashes are rider error crashes.

^^^agreed. These "cold tire" crashes usually happen within the first 5 minutes of someone taking their bike out for the first time in the spring. They blame it on the tires not being warmed up, but unless you are getting a knee down, cold tires are not your problem it's being rusty at riding. Also most street tires even street/track day tires are designed to not need any kind of warm up or tire warmers and should be very sticky even when cold. The exception could be some DOT race tires and slicks that require warm ups.

[Doc]

Friggin Twist the throttle you pussy! Then you will have your cold tire crash like the rest of us. :

[dannyjm]

You're my hero. I try to explain this to customers all the time, finally someone to corroborate my findings. Tire pressure sensors seem to have exacerbated this problem.

you'd need a hellish dirtbike to ride through these layers of irony?
ms physics

[oVTo]

When stored over winter - the front tire has less volume and cools quicker, transfering pressure to the higher volume rear tire. It's called "Air Pressure Dependence of Natural-Convection Heat Transfer"
For the technical curious the detail is here
http://www.iaeng.org/publication/WCE...p1444-1447.pdf

That's exactly why I only put 100% pure nitrogen in my tires. It prevents APDNCHT, and it helps tires warm up faster in the spring.

[Eddie]

Not to start a big argument here, but what are you guys doing?

My street bike has 3 year old bald DOT take offs with 20 PSI. And by bald, I mean the water grooves are gone.

I've been riding in 40-50 degree weather over the last month & I've yet to experience any sort of traction loss.

Even when intentionally locking the rear to slide around, I still can't get to a point where I don't have control.

We see them every year around this time & I'm very skeptical about believing the whole cold tire myth. Are you guys smashing the throttle at full lean?

What do you mean by bald Jimbo? Tires never go bald in South America...some of the locals carve new grooves in bald tires....I know!! Full retard, right? I've actually seem it first hand.

[Eddie]

Here is one (and call me stupid if you want to): Back in a TD in a cold november day, I remember doing okay laps in the morning. First section after lunch going up the hill after T3 my 1000RR did an huge tail whip to one side, I counter steered, and so it whipped the other way, and again, and again until I fully recovered. In fact, the person riding behind me ( he posted about this here, can't remember who) said he was just waiting for me to go down. Call it pilot error if you want but I like to think that I did an awesome job bringing the bike back to the pit in one piece.

My theory: I am not an expert on the matter, so this my be completely stupid: after the somewhat reasonable warm section in the morning, the outter layer of the tire crystalized in light of the fast change in temperature to cold. Like I said, I am not sure if this is accurate.

But seriously Jim, you know it better, it is up to the rider to have complete control over his equipment. Which brings us to another subject matter: sounds like your rubber is way overdue.

[Jim]

Eddie, you're comparing track riding on cold tires though. completely different when you're trying to go fast, as opposed to putting around on the street.

[G21forme]

That was me Eddie, and that was a crazy save on highside hill no less on a liter bike!

Eta was that the day the corner workers were calling snow?

[OreoGaborio]

First section after lunch going up the hill after T3 my 1000RR did an huge tail whip to one side, I counter steered, and so it whipped the other way, and again, and again until I fully recovered. In fact, the person riding behind me ( he posted about this here, can't remember who) said he was just waiting for me to go down. Call it pilot error if you want but I like to think that I did an awesome job bringing the bike back to the pit in one piece.

"Bikes don't crash.... we just fuck it up."

What you did was an awesome job of not fucking it up enough to go down

[kumpy]

After they mentioned it in the riders meeting at Sepang, a guy from South Africa with a first time out on his newly bought KTM RC8 crashed on the first day, first session, 2nd corner on cold tires in 90 degree temps!

[CBR929RE]

After they mentioned it in the riders meeting at Sepang, a guy from South Africa with a first time out on his newly bought KTM RC8 crashed on the first day, first session, 2nd corner on cold tires in 90 degree temps!

fuck you and riding at Sepang

[Danz19899]

Never crashed due to cold tires. But at one point I had track day take off BT-002's and around 35 degrees they were REALLY sketchy for the first 15minutes of riding.

[Jim]

i had my NTECs spin when riding straight up in 50 degree temp with 32 PSI this season. Ended up backing it down to like 24 PSI after, and made a mental note to be less throttle happy.

[RandyO]

I've ridden in -25°f, sand, snow, sleet, freezing rain and low air pressure(less than 10psi) on a 90° day and non of them have ever caused me to crash

[xsiliconkid]

"cold tire", is a relative term.
As an example, race tires optimum temp for best traction is around 170oF. So, a 90oF carcass while it will have more grip than at 50oF, is still considered a "cold tire" as the carcass has nowhere near optimum traction.

Street tires optimum working temp is much lower then race tires but just because it’s a warm 75oF day the tires are still considered “cold tires” if you want to start pushing traction limits.

[Paul_E_D]

After they mentioned it in the riders meeting at Sepang, a guy from South Africa with a first time out on his newly bought KTM RC8 crashed on the first day, first session, 2nd corner on cold tires in 90 degree temps!

It was only in the 90s in Sepang? Pffftt!!! Jersey is hotter than that!

[MaRce1o]

My GP211 UKs won't pop a wheelie if it's cold out, will just keep spinning on my 1k though

Never had a problem with my front and I didn't even check the pressure when I mounted them about 9 months ago lol

[SVRACER01]

maybe Jims onto something here. Jim always crashes on warm or hot tires. no more tire warmers for you jimmy.