bm2016

supposedly, mpsc2 heat cycle out in 12-16 cycles. this generally leaves plenty of tread on the tire, but diminished grip.

can those in the know explain to the rest of us what exactly constitutes a heat cycle? is it when the tire attains a specific temperature? does the tire need to be at that temperature for a certain duration of time?

thx for your knowledge.

bm2016

Mr. Turtles

I'm sure a tire engineer will speak up shortly but In general terms a heat cycle, in the sense you are asking about, on the MPSC2 will occur after about 10-15 minutes of track time at speed. What "at speed" means is different for everyone. I get what you said 12-16 good 20-30 minute sessions (heat cycles) and then the MSPC2 would fall off dramatically but I would drive them for another 4-8 sessions just a little slower. I've seem some guys put over 30 heat cycles on their tires. IMHO they are not pushing it and because of lower speed don't even notice the tire going away on them. Other than when a tire cords, we all have an opinion when a tire is done. Some people will drive them till they cord even though they are sliding around but will just slow down.

MarcusG

When you can see a "cord" we call those May Pops.

tqevo

https://rennlist.com/forums/racing-a...eat-cycle.html

flyjets

No tire warmers 2 laps to bring the tires up to temp and then start a session. That accounts for a heat cycle. Its possible to heat cycle out a tire B4 the tread is gone.
Especially if the track goes yellow a few times. I can check the rubber with a Durometer also I measure Track temp with a temp gun.
My 2 cents
Ian

Mech33

According to a tire engineer, it’s the total time at temperature while the rubber continues to react and crosslink (not simply a “cycle”) that causes it to degrade.

911therapy

Thats interesting, and makes a lot more sense. So, its the total time "at temperature" and not x number of times that the tire is brought up to temperature.

erik_plus8

Is it possible to judge if a tire has reached its max amount of heat cycles? (besides the obvious, that it's lacking grip). I mean, can you do a hardness measurement or similar, on a cold tire sitting at home?