Cold tear?

[Mart]

Is there anyone here who can explain the meaning of the word cold tear on the tyres.
Has anything to do with heat cycles :)

[Jet City Racer]

Simply put, if you apply too much heat to the surface of the tire without gradually heating the carcass by doing a few easy laps or tire warmers it will pull/tear the top surface of the tire. It will look like someone took a cheese grater to it. Sorry for the crappy picture, but this is an example of it.

[Mart]

Thank`s JCR :)
how long time will it take to reach the right tyre temparature 5m??

[Chuck B]

Thank`s JCR :)
how long time will it take to reach the right tyre temparature 5m??

Depends on tire manufacture, which tread compound, tire ambient temp, ambient air temp, track temp and what you do to heat them up. Tire warmers, if done correctly, will have you starting with a pretty good temp for the tires. many think weaving back n forth heats tires....not. That simply scuffs the tires it doesn't heat the core. Accelleration and braking (flexing the body of the tire) builds heat.

[Jet City Racer]

Race tires normally take more time to warm up than street compound as they are softer and are designed to run at a higher temperature. It's virtually imposible to cold tear a street tire as it's a very hard compound design. Race tires feel like you're riding on ice when they are cold. Do a slow warm up lap to gradually add some heat, increase your speed a bit on the second, and by the time you do the third lap they should be good to go, PROVIDING it's not 50 degrees out. :eek:

Just like your muscles, you need to warm them up or they'll tear. :peace:

[billerzal]

Cold tearing is commonly caused by the track surface. Some tracks just cause the tires to tear. Using warmers may or may not help, but definitely use them if you have them. Run tire pressure maybe 1 psi up. Also, your setup (overdampening) on either end can cause it. Once the tearing starts, it usually doesn't stop.

Motorsports Ranch in Cresson, TX is one of those tracks. Here's my front tire after a full day of practice early this spring. That's a Pirelli SuperCorsa RS1 (blue) compound.

-bill.

[bilter]

Damn Billerzal! Are there any left hand turns there or are you just running on an oval? Great pic to show an example though

[billerzal]

Cresson backward (CW) is RH dominant. When we run CCW the same thing can happen to the LH side of the tire. Here's another pic taken that day - you can see the LH side tearing on the rear.

[Mart]

Halleluja billerzal that was very illustrative tear. :eek:

[clarkie49]

Cold tearing can always be avoided, the proper suspension setup and tire pressures are key to making this happen, it is a lot easier to cold tear a rear tire than a front tire.

Bill if you were using warmers and that still happens you have some serious front end suspension issues, Pirelli's gerneally dont tear up like that unless you are running too much compression or preload ;)

[billerzal]

Aaron - don't disagree, like I said overdampening contributes to it. However, MSR is a place that tears (because of the surface) much worse than anywhere else we race. It was cold and the track was green all day.

I'll take this opportunity to thank Jim Cambrora of www.RaceworxUSA.com (http://www.RaceworxUSA.com ) for helping me with setup this season. Jim is a suspension guru that works with lots of the top CMRA guys. My front was not far off as I ran fast lap in Hw Twins at 1:19.491, then fast lap in F40-HW at 1:20.379 running in this direction with this setup. I know, I know - fast lap doesn't win championships (or Aprilia dollars).

Good luck to all you guys racing for Aprilia dollars. Unfortunitely I've hit the pavement too many times and I'm out of the points this year. I'll be back - just hope Aprilia dollars are too.


Cheers, Bill.

[clarkie49]

F40!! Come on Bill your not 40, are you? I know most of us feel 40 after a couple of years :D

Glad you got you front end working well, a good suspension guy to work with is a definite must have :) hey you had a crappy year but have proved you can run just as fast if not faster than anyone else, just make sure you are healthy for next year so you can kick ass! :cool:

[Jet City Racer]

Aaron - don't disagree
So I gather you guys know each other??? :D

I really agree with the set up being a major contributor to tearing/abnormal wear. I see people completely destroy the left side of their tires at Thunderhill and the right side at Buttonwillow, but mine will last the whole weekend and still be good for the next practice day.

Either that, or I ride like a girl. :rolleyes:

[billerzal]

yep this season has been hard on my 40+ yr. old body – let’s see 1 broken thumb, 3 broken ribs and most recently a broken shoulder. I'm feeling my age alright.

I have been going fast this year though and love racing the big bike. Mostly it’s been my mistakes – pushing too hard on shagged tires, etc.. I’ll race our last round at TWS but yea mostly heal up real good and train hard over the winter.

I’m expecting great things from you and Jonny Boy winning big Aprilia dollars$$ Good luck.

Mart – sorry for hijacking your thread.

JCR - you're probably riding smooth on a well setup bike.

[Kam]

Hey guys, just did a couple hundred miles on the tuonoR, w/diablos and noticed some cold tearing in the center of the tire after a 20 mile highway stretch? Pressures 34F 36R. Speed on the HW around 80ish. Is this a compression or rebound problem? NO cold tearing or wear issues noticed after spirited backroad sessions...???

[mysubaruimp]

Hey guys, just did a couple hundred miles on the tuonoR, w/diablos and noticed some cold tearing in the center of the tire after a 20 mile highway stretch? Pressures 34F 36R. Speed on the HW around 80ish. Is this a compression or rebound problem? NO cold tearing or wear issues noticed after spirited backroad sessions...???

This happens to me on my Metzeler M1s.