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post #1 of 23 (permalink) Old 08-02-2010, 08:25 AM Thread Starter
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Tire education please

Running Pirelli Supercorsa Pro TD tires, they have a day at blackhawk and a SED at putnam (lots of track time). Pressures 29 front 27 rear cold. Used with warmers.

After a long hot day riding at putnam I'm getting what I guess is cold tearing on the left side, can anyone confirm? Is there anything I can do to prevent this if I see it happening in the future or is that something that's just going to happen at a track like putnam that heavily favors one side of the tire?




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post #2 of 23 (permalink) Old 08-02-2010, 10:39 AM
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What are your hot pressures? If you are using warmers, you should set them hot then check them hot off the track.

Stock shock?
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post #3 of 23 (permalink) Old 08-02-2010, 10:46 AM
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post #4 of 23 (permalink) Old 08-02-2010, 10:46 AM Thread Starter
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Didn't check my hot pressures.

Yes stock shock (setup by turn 1, and no, they weren't happy about it being stock haha).

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post #5 of 23 (permalink) Old 08-02-2010, 11:13 AM
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Didn't check my hot pressures.

Yes stock shock (setup by turn 1, and no, they weren't happy about it being stock haha).
If you run a A pace on a stock shock, that will happen.

I would start thinking about buying a better rear shock. When I did, my rear tire wear improved leaps and bounds.

You my be able to have the stock shock reworked. I'm not sure if Turn one will but I know Trackside suspension & Engineering will. It won't be as good as a proper penske or ohlins but definitely better for half the cash.

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post #6 of 23 (permalink) Old 08-02-2010, 11:17 AM Thread Starter
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If you run a A pace on a stock shock, that will happen.

I would start thinking about buying a better rear shock. When I did, my rear tire wear improved leaps and bounds.

You my be able to have the stock shock reworked. I'm not sure if Turn one will but I know Trackside suspension & Engineering will. It won't be as good as a proper penske or ohlins but definitely better for half the cash.
You're suggesting that my stock shock isn't damping effectively, or that it's undersprung? If it's the rear shock that's likely causing my problems how come the right side of the tire looks so much better? Man, I have a lot to learn... Maybe I should just slow down, it's cheaper

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post #7 of 23 (permalink) Old 08-02-2010, 11:19 AM
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Yes.... cold tear.

Probably Suspension.


Have you done sag and all that such ? If so an inspection of rear rebound is in order.


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post #8 of 23 (permalink) Old 08-02-2010, 11:22 AM Thread Starter
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Originally Posted by BLARNEY View Post
Yes.... cold tear.

Probably Suspension.


Have you done sag and all that such ? If so an inspection of rear rebound is in order.


Tom
Turn One setup my suspension late last year. However, the bike is now approaching 5 years old, and the shock has never been serviced in any way, it also has 25-30k miles on it. I wouldn't be suprised if it was shot. But that still doesn't mean I want to drop a G on a new one I had my front forks redone last year, maybe this winter I'll do the rear.

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post #9 of 23 (permalink) Old 08-02-2010, 11:33 AM
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Mine did the same thing at blackhawk but on the right side. It looked very similar, like a mild cold tear. Did the rear shock at it healed itself and I got 2 more days out of it.
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post #10 of 23 (permalink) Old 08-02-2010, 11:34 AM
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If the rebound is too quick it will tear the tire like that.

Now that said..... would expect to see it more evenly on both sides.

Putnam does run the left side pretty cool.


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post #11 of 23 (permalink) Old 08-02-2010, 11:36 AM Thread Starter
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Thanks for the info guys I appreciate it

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post #12 of 23 (permalink) Old 08-02-2010, 11:46 AM
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Quote:
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You're suggesting that my stock shock isn't damping effectively, or that it's undersprung? If it's the rear shock that's likely causing my problems how come the right side of the tire looks so much better? Man, I have a lot to learn... Maybe I should just slow down, it's cheaper
Without more info, I'm ball parking.

Now that I read it is a 5 year old stocker, Yes not damping effectively.

The suspension oil brakes down like motor oil. The harder the use the faster it brakes down. For regular street riding, forks and shock should be serviced every couple of years. Throw in some track days and it becomes a more frequent service thing.

I now some racers that change suspension oil after 4 events.

Stock shocks tend to get out rode by A pace. They will work but tire wear will suffer.

Depending on the bike, you my find a nice used one on ebay or the wera board. They only cost a couple hundo to have serviced/rebuilt.

I have been told by a respected suspension guru, all but a few top level riders will do good with just a double adjustable shock(think less expensive)
I thought I just saw someone selling new Penske for like $750.

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post #13 of 23 (permalink) Old 08-02-2010, 11:47 AM
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Isn't Putnum pretty heavy on the left side? I got something similar to that after running at Autobahn for a day. When I got home I got worried something was wrong and spoke with Greg K. He already knew my question before I even asked and said my tire was fine. Sure enough after I went to Blackhawk the tires looked nice and even.

Not sure if your case is exactly the same, but we run the same tires on a 600
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post #14 of 23 (permalink) Old 08-02-2010, 11:50 AM
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Thanks for the info guys I appreciate it
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post #15 of 23 (permalink) Old 08-02-2010, 12:48 PM Thread Starter
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Quote:
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Isn't Putnum pretty heavy on the left side?
No that's the thing, putnam only has 2 left's.

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post #16 of 23 (permalink) Old 08-02-2010, 03:46 PM
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before you go out and buy a shock, start setting your pressures when they're hot because there might be a much simpler solution here. 27/cold in the rear means you're probably running well over 30/hot which will make it pretty hard to keep heat in the tire. sunday morning was kinda chilly, and i believe my rear tire was 5 or 6 psi higher once it was on the warmer for a while. also remember that putnam is very abrasive compared to other tracks and the left side of the tire has a looong time to cool down through 9, 10, the strait, 1, 2, and 3.

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post #17 of 23 (permalink) Old 08-02-2010, 04:06 PM
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Quote:
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before you go out and buy a shock, start setting your pressures when they're hot because there might be a much simpler solution here. 27/cold in the rear means you're probably running well over 30/hot which will make it pretty hard to keep heat in the tire. sunday morning was kinda chilly, and i believe my rear tire was 5 or 6 psi higher once it was on the warmer for a while. also remember that putnam is very abrasive compared to other tracks and the left side of the tire has a looong time to cool down through 9, 10, the strait, 1, 2, and 3.
I was actually thinking the same thing...

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post #18 of 23 (permalink) Old 08-02-2010, 05:46 PM
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before you go out and buy a shock, start setting your pressures when they're hot because there might be a much simpler solution here. 27/cold in the rear means you're probably running well over 30/hot which will make it pretty hard to keep heat in the tire. sunday morning was kinda chilly, and i believe my rear tire was 5 or 6 psi higher once it was on the warmer for a while. also remember that putnam is very abrasive compared to other tracks and the left side of the tire has a looong time to cool down through 9, 10, the strait, 1, 2, and 3.
+2

Now that I think about it, I set mine cold at 25-26 and target 28-29 hot. When it tore at BHF, my hot off the track was 31-32.
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post #19 of 23 (permalink) Old 08-02-2010, 06:48 PM Thread Starter
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Ok game plan is lower the pressure (and record cold and hot pressures) at blackhawk chili cookoff weekend and go from there. Thanks

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post #20 of 23 (permalink) Old 08-02-2010, 08:36 PM
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Jeremy...

For comparison I have been setting the same tires at 26 rear / 30 front cold settings. This was per Dustin as a starting point. My tires have worn nice and evenly when run at Blackhawk and Autobahn. I know it might be apples to oranges, but I run a stock suspended 600 as well.
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post #21 of 23 (permalink) Old 08-02-2010, 08:59 PM
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Ok game plan is lower the pressure (and record cold and hot pressures) at blackhawk chili cookoff weekend and go from there. Thanks
sounds good to me. i'll be happy to help you at blackhawk and we'll get the left side looking like the right again. you have warmers, so there's no reason to pay attention to cold pressures anymore.

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post #22 of 23 (permalink) Old 08-02-2010, 09:08 PM Thread Starter
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Thanks Jordan, I'm riding sunday the 5th, i'll come find you

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post #23 of 23 (permalink) Old 08-02-2010, 09:25 PM
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Here's a link to some basic suspension 101 and tire wear info....... http://www.crstuning.com/tuning_guide.htm
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