how do you know when too many heat cycles? - Chicagoland Sportbikes
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post #1 of 10 (permalink) Old 05-20-2004, 08:52 AM Thread Starter
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how do you know when too many heat cycles?

I've had this question rolling around in my head for some time. Here's the long story why.

Last year I wrecked in July at Grattan. It was a stupid error on my part because my contact slipped off my eye and i tried to blink it back into place...just before 10A. Anyway, the bike tumbled pretty bad.

Once I got it up and running, the bike didn't seem right. I never got it to Drucker's to see if it was straight. I took it to Grattan for our CLSB day and it felt as if the suspension wasn't hooking up in right hand turns. I ended up going down in the esses just before the bowl. I was going slow and barely leaned. So, I wasn't comfortable all day. I figured my geometry was messed up.

So, I take to Drucker's and it is tweaked, but not too far out of spec. So, I got to thinking. Could too many heat cycles on a tire make the bike feel that way...coupled w/ the bike being tweaked a bit?


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post #2 of 10 (permalink) Old 05-20-2004, 08:57 AM
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usually when your tires start turning blue. Thats the oil releasing from the rubber and then the ruber turns hard.

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post #3 of 10 (permalink) Old 05-20-2004, 09:21 AM
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Quote:
Originally posted by racingxtc7
usually when your tires start turning blue. Thats the oil releasing from the rubber and then the ruber turns hard.

Jeff
Jeez, I've had tires do that after one session. They would seem okay after they heated up again though.

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post #4 of 10 (permalink) Old 05-20-2004, 09:33 AM Thread Starter
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yeah, i've had mine turn blue after a session or too also. I'm wondering what/how the bike would feel like riding w/ tires that have too many heat cycles?

I think I have another trackday in my tires, but i ordered new for piece of mind.


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post #5 of 10 (permalink) Old 05-20-2004, 09:37 AM
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Doc.. don't worry about heat cycles as much as what your tires do underneath you. You'll know when the tires are done for when you do lap after lap after lap and all of sudden the tires start sliding or just not hooking up as well. Although I hear Michelins don't give you a nice warning like the dunlops do.

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post #6 of 10 (permalink) Old 05-20-2004, 09:48 AM Thread Starter
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Well, that's sort of what happened. In the right hand turns, it almost felt like the suspension wasn't working. The bike felt REAL loose.

The new tires will be here today, but I was wondering if that was the cause of my little low-speed get off.


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post #7 of 10 (permalink) Old 05-20-2004, 09:53 AM
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Actually there was a great article in last months RRW about tire warmers that covered some of this. I thought too once they started turning blue they were done. But apparently that's not the case, once they heat up again that blue shade should go away.

Don't remember all the details but it was a pretty good article.
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post #8 of 10 (permalink) Old 05-20-2004, 10:05 AM
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Doc,
I bet a new set of tires and a bit of confidence will fix that loose feeling right up! When and if youre tires start going off, you'll know it as long as your suspension is somewhat close to being set up properly for your weight, riding style, etc..

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post #9 of 10 (permalink) Old 05-20-2004, 10:16 AM
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Bluing does not mean your tires are shot. Bluing is a natural occurrence and can be scrubbed off in a lap or two. What we've learned with the MIchelins is that you will start noticing what looks like "cold tear" occurring in a 1" wide band, approximately 1" in from the edge of the tire. This is a result of the carcass thinning to the point where it will no longer hold in the heat in that area.

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post #10 of 10 (permalink) Old 05-20-2004, 10:24 AM
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Quote:
Originally posted by KBOlsen
Bluing does not mean your tires are shot. Bluing is a natural occurrence and can be scrubbed off in a lap or two. What we've learned with the MIchelins is that you will start noticing what looks like "cold tear" occurring in a 1" wide band, approximately 1" in from the edge of the tire. This is a result of the carcass thinning to the point where it will no longer hold in the heat in that area.
Sounds like the tires I just took off the SV after the NESBA day. But I can't complain I did three days at Jennings on those and two at Blackhawk so I was ok with dumping them after that.
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