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Old 10-29-2009, 06:33 PM   #1
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Exclamation Air Temperature vs. Tire Grip

Is there a rule of thumb or some type of guideline that states when the ambient temperature drops to a specified number that there is a point where tires lose a significant amount of grip and itís just not a good idea to push them? Whatís that air temperature threshold if it does exist?
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Old 10-29-2009, 06:44 PM   #2
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last cold day at TWS (Texas World Speedway), SCRC John recommeded dropping pressures by 1 or 2 psi from your regular track day pressure.

i'm sure John will pop in here soon and lay out the tire knowledge.
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Old 10-29-2009, 06:50 PM   #3
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Quote:
Originally Posted by switch View Post
last cold day at TWS (Texas World Speedway), SCRC John recommeded dropping pressures by 1 or 2 psi from your regular track day pressure.

i'm sure John will pop in here soon and lay out the tire knowledge.
Thats not even close to what he was asking
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Old 10-29-2009, 07:02 PM   #4
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I think it takes longer for them to warm up and stay warm during cold temperatures. Im gonna drop my psi to 31/32 pretty soon for the winter.
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Old 10-29-2009, 07:16 PM   #5
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Quote:
Originally Posted by switch View Post
last cold day at TWS (Texas World Speedway), SCRC John recommeded dropping pressures by 1 or 2 psi from your regular track day pressure.

i'm sure John will pop in here soon and lay out the tire knowledge.
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Thats not even close to what he was asking
It has to do with the same topic, he just didn't say that there was a definate temp. As it gets colder lower your tire pressures so they will create more heat to compensate for the colder temps.

I'm no tire expert by any means but it makes sense to me, sorry if it doesn't to anyone else.
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Old 10-29-2009, 07:18 PM   #6
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Bevo where are you?? Are you asking at what Outside Temp will there be a significant drop in traction no matter how low you drop PSI??? Because that is what I am reading from your question and I am eagerly awaiting an answer

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Old 10-29-2009, 08:03 PM   #7
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Quote:
Originally Posted by 07CBR View Post
It has to do with the same topic, he just didn't say that there was a definate temp. As it gets colder lower your tire pressures so they will create more heat to compensate for the colder temps.

I'm no tire expert by any means but it makes sense to me, sorry if it doesn't to anyone else.
That makes sense, I'm just trying to find out if there is a certain air temperature when tires will lose significant grip and if there is some air temperature where you guys say, "I'm not riding hard today" because of it.
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Old 10-29-2009, 08:05 PM   #8
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Quote:
Originally Posted by AJFLo View Post
Bevo where are you?? Are you asking at what Outside Temp will there be a significant drop in traction no matter how low you drop PSI??? Because that is what I am reading from your question and I am eagerly awaiting an answer

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Yes that is what I'm asking. I'm not worried about today. Just asking for future riding in Houston this winter
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Old 10-29-2009, 08:11 PM   #9
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bring tire warmers to PP1, problem solved.
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Old 10-29-2009, 08:16 PM   #10
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Quote:
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bring tire warmers to PP1, problem solved.
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Old 10-29-2009, 08:24 PM   #11
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This is a good question b/c I went to a sport touring tire to get some more miles out of a rear. Now winter is approaching with all around cooler temps. How long should u wait till you can consider ur tires warm? What temp is all lost?
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Old 10-29-2009, 08:27 PM   #12
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Quote:
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bring tire warmers to PP1, problem solved.
You just want to be my PP1 pit girl
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Old 10-30-2009, 05:51 AM   #13
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anyone?
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Old 10-30-2009, 08:35 AM   #14
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Summer tires loose there effective grip at 45 degrees... You should be cautious at 40 degrees...



I cannot answer what tire pressure should be and how long to warm up the tires since I never has to worry about that in NYC... We only rode in warm weather...
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Old 10-30-2009, 08:43 AM   #15
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Summer tires loose there effective grip at 45 degrees... You should be cautious at 40 degrees...



I cannot answer what tire pressure should be and how long to warm up the tires since I never has to worry about that in NYC... We only rode in warm weather...
That's for cars, bike don't have "summer tires".

Typically for most street riders with street tires, traction will begin to decrease below 70 degrees.
There's no sliding scale and a lot of factors come into play such as tire brand, model, air pressure, bike, road surface etc.

The best you can do is make sure to keep your tires properly inflated. With wide ranging temperatures your tire pressure will vary as much as 4-5 psi.
I check mine weekly during the fall winter months.

Track use is different entirely. You'll typically drop your pressures a couple of psi. but even then you won't see max traction available compared to say an 80 degree day.
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Old 10-30-2009, 09:47 AM   #16
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Quote:
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That's for cars, bike don't have "summer tires".

Typically for most street riders with street tires, traction will begin to decrease below 70 degrees.
There's no sliding scale and a lot of factors come into play such as tire brand, model, air pressure, bike, road surface etc.

The best you can do is make sure to keep your tires properly inflated. With wide ranging temperatures your tire pressure will vary as much as 4-5 psi.
I check mine weekly during the fall winter months.

Track use is different entirely. You'll typically drop your pressures a couple of psi. but even then you won't see max traction available compared to say an 80 degree day.
I guess you have to fly by the seat of your pants or leathers
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Old 10-30-2009, 09:53 AM   #17
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so maybe its a dumb question.... but what the

so...would a track/street tire or even pure race tires be more slippery on the streets in the cold?- They have softer compound and more grip.... but they take even longer to warm up(so i thought, but correct me if im wrong). Therefore, would they be any good or more harmful? does that make em more slippery?

Hope that makes sense.....
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Old 10-30-2009, 09:53 AM   #18
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When it gets colder you have to pay more attention. Lean angles that you can get away with when it's warm will slip and slide when it's cold.

Or, get used to the bike moving around and ride that puppy!

The perfect mix of lateral and vertical G force is at 45 degrees... definately wouldn't push past that point when it's chilly out. Remember, even if your tires have lots of heat in them, the road doesn't.

Track tires are difficult to put enough heat into in the summer, on the street. You don't have the constant side loading on the street you do on the track, just too many straights to let them cool.
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Old 10-30-2009, 10:10 AM   #19
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If you have to worry about losing grip on the streets due to temp/lean angle etc....

you are riding to hard.
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Old 10-30-2009, 11:02 AM   #20
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Quote:
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When it gets colder you have to pay more attention. Lean angles that you can get away with when it's warm will slip and slide when it's cold.

Or, get used to the bike moving around and ride that puppy!

The perfect mix of lateral and vertical G force is at 45 degrees... definately wouldn't push past that point when it's chilly out. Remember, even if your tires have lots of heat in them, the road doesn't.

Track tires are difficult to put enough heat into in the summer, on the street. You don't have the constant side loading on the street you do on the track, just too many straights to let them cool.
I thought riding in a straight line heats up tires as does braking in a straight line
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