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Old 10-30-2009, 11:03 AM   #21
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Quote:
Originally Posted by Patrick View Post
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, 11:51 AM   #22
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Quote:
Originally Posted by texlurch View Post
The perfect mix of lateral and vertical G force is at 45 degrees...
Only if you are not moving. Right Tex?

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Old 10-30-2009, 01:01 PM   #23
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Quote:
Originally Posted by maxgs View Post
Only if you are not moving. Right Tex?

-Curt
nope, in a curve.. at 45 degrees lean angle you have an equal amount of side and verticle grip on your tires.. maybe I just worded it wrong.

Lean more than 45, you add more side load to the tire, less than 45 you add more vertical.. modern sportbikes can go close to 30, more or less?

Hence the reason you want the bike more upright when you get on the gas.
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Old 10-30-2009, 01:05 PM   #24
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Less than 45 degrees... more lateral load than vertical, tread lightly
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Old 10-30-2009, 01:15 PM   #25
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It's actually fresh in my mind after reading a Keith Code article about the "Perfect G".. at 45 degrees you have 1 G pulling you down, and 1 G pulling you out.. so you can get a perfect balance there...

Here is another one for thought...

http://www.sportrider.com/riding_tip...lls/index.html
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Old 10-30-2009, 01:29 PM   #26
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Reading a story the other day said your tire is not up to proper temp untill you can feel heat in the rim.

Anything below 70 and I would back it way down.
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Old 10-30-2009, 01:44 PM   #27
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To the OP,
There is a temp range that will typically start to effect the tire's ability to produce heat and grip. Approx 70-60 deg F. There are many factors that help or hinder a tire's abiltiy to heat up.
Set-up - A bike that isn't setup correctly will not load the tires properly, thus this load helps produce heat and traction.

Air Pressure - Air pressure is always a balance of traction and longevity. Too high and you negatively effect the tire's ability to flex and produce heat. It also limits the contact patch size. Too low and the tire can over flex thus feeling loose or disconected from the chassis. It heats up good and the contact patch is more than adequate, but you loose alot of tire/chassis communication through excessive tire flex.

Road surface - More grainular surfaces or coarser surfaces tend to load the tire surface on the "high points" of the road surface. This limits contact patch, but the coarsness helps heat production. A smoother road surface maximizes heat production through contact patch, but any debrise and fluids can greatly impact traction.

With all of this said, there is not a magic number for tires to work perfect in every enviorment. Ridden sensibly on the street, most tires will work fine if the pressures are monitored regularly and the bike is maintained properly.
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Old 10-30-2009, 01:49 PM   #28
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So we have a thread with some talking about degress of angle while others are talking degrees in temperature


This thread is all jacked up!!!
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Old 10-30-2009, 01:50 PM   #29
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Quote:
Originally Posted by TeleRomeo View Post
So we have a thread with some talking about degress of angle while others are talking degrees in temperature


This thread is all jacked up!!!
welcome to a normal motorcycle fourm
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Old 10-30-2009, 01:55 PM   #30
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nahhhh inverse curve

as temps go down, lean angles must go up, or you go down....
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Old 10-30-2009, 02:00 PM   #31
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Quote:
Originally Posted by texlurch View Post
nope, in a curve.. at 45 degrees lean angle you have an equal amount of side and verticle grip on your tires.. maybe I just worded it wrong.

Lean more than 45, you add more side load to the tire, less than 45 you add more vertical.. modern sportbikes can go close to 30, more or less?

Hence the reason you want the bike more upright when you get on the gas.

A ducati leaves chicago at 3pm and a zx-10 leaves memphis at 4....oh wait..wrong thread....


//sorry, math nerd.....
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Old 10-30-2009, 02:08 PM   #32
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Quote:
Originally Posted by baditalian00 View Post
A ducati leaves chicago at 3pm and a zx-10 leaves memphis at 4....oh wait..wrong thread....


//sorry, math nerd.....
haha I remember those back in school. I hated them!
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Old 10-30-2009, 02:45 PM   #33
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Quote:
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welcome to a normal motorcycle fourm
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Old 10-30-2009, 02:52 PM   #34
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Quote:
Originally Posted by SCRC John View Post
To the OP,
There is a temp range that will typically start to effect the tire's ability to produce heat and grip. Approx 70-60 deg F. There are many factors that help or hinder a tire's abiltiy to heat up.
Set-up - A bike that isn't setup correctly will not load the tires properly, thus this load helps produce heat and traction.

Air Pressure - Air pressure is always a balance of traction and longevity. Too high and you negatively effect the tire's ability to flex and produce heat. It also limits the contact patch size. Too low and the tire can over flex thus feeling loose or disconected from the chassis. It heats up good and the contact patch is more than adequate, but you loose alot of tire/chassis communication through excessive tire flex.

Road surface - More grainular surfaces or coarser surfaces tend to load the tire surface on the "high points" of the road surface. This limits contact patch, but the coarsness helps heat production. A smoother road surface maximizes heat production through contact patch, but any debrise and fluids can greatly impact traction.

With all of this said, there is not a magic number for tires to work perfect in every enviorment. Ridden sensibly on the street, most tires will work fine if the pressures are monitored regularly and the bike is maintained properly.
Thanks
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