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Old 04-22-2004, 09:39 AM   #1
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Tire Pressure "Rule of Thumb"

I heard that the tire pressure you should run on your bike should be set up so that if you were to go out and RIDE AT YOUR TYPICAL PACE FOR ABOUT 30 MINS (for tires to get as hot as they will under YOUR riding), the tire pressure increase should equal 10%. So if you left your driveway with 40 psi, hit the twisties at your usual pace for 30 mins and then re-measured tire pressure, it should be 44 psi. This supposedly will give you the best grip and tire wear.

For the more experienced; is this B.S. or ?
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Old 04-22-2004, 09:57 AM   #2
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I heard tires have an ideal pressure and what you want to do is ride, check the pressure, and increase or decrease 1/2 the difference at a time.

Ideal for max grip may be closer to 36psi. Don't hit any pot holes or ride two up.

For max tire life and "street" handeling may be around 42-44.

Your way may depend too much on the road temp heating the tire for 10% increase.

What do you racers run when the tire is hot?
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Old 04-22-2004, 12:54 PM   #3
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Diablo Corsas set at 33ish front and 35ish rear depending on the track/temp etc.
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Old 04-22-2004, 01:06 PM   #4
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the lower you run the pressure in the tire the more the tire is going to squash and give you more contact patch. this in turn heats the tire more. depending on the tires you use, and how you ride, is how you set your tire pressure (and of course track/road temp) i ran my 208s at 32 psi on palomar and i overheated the crap out of them. they aren't black anymore they are blue... but they stuck like glue for a little while. now they are harder and don't grip very well. but if you buy a more track orented tire they are made to take more heat and you can run less pressure in them to heat them up better and get a better contact patch. i have a set of diablo corsas i can't wait to put on... the dunlops are slippery now, but i'm to cheap to toss a half shreaded tire.
anyway, you can't just take someone elses pressure and use it, much like suspension settings. there is alot of trial and error that goes into getting tire pressure choice correct, but if you looking for a ball park just tell us what tires you run and what type of riding you do, and your weight, and i'll try to give you a ballpark. or the racers can probobly help alot more.
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Old 12-16-2009, 07:04 PM   #5
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i got a brand new 08 600rr and im 6'1" 225 i mostly just do street and freeway riding. i dont think ill be doing track. do you think you can help me out fox? oh ya the tires are front 120/70zr17m/c (58w) rear 180/55zr17m/c (73w) dunlops
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Old 12-16-2009, 07:14 PM   #6
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Quote:
Originally Posted by Despair IX View Post
i got a brand new 08 600rr and im 6'1" 225 i mostly just do street and freeway riding. i dont think ill be doing track. do you think you can help me out fox? oh ya the tires are front 120/70zr17m/c (58w) rear 180/55zr17m/c (73w) dunlops
just set them at 36/36 if you're riding solo, if you want to carry a passenger you can pump the rear to 42psi maximum.
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Old 12-16-2009, 07:32 PM   #7
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Quote:
Originally Posted by FOX View Post
the lower you run the pressure in the tire the more the tire is going to squash and give you more contact patch. this in turn heats the tire more. depending on the tires you use, and how you ride, is how you set your tire pressure (and of course track/road temp) i ran my 208s at 32 psi on palomar and i overheated the crap out of them. they aren't black anymore they are blue... but they stuck like glue for a little while. now they are harder and don't grip very well. but if you buy a more track orented tire they are made to take more heat and you can run less pressure in them to heat them up better and get a better contact patch. i have a set of diablo corsas i can't wait to put on... the dunlops are slippery now, but i'm to cheap to toss a half shreaded tire.
anyway, you can't just take someone elses pressure and use it, much like suspension settings. there is alot of trial and error that goes into getting tire pressure choice correct, but if you looking for a ball park just tell us what tires you run and what type of riding you do, and your weight, and i'll try to give you a ballpark. or the racers can probobly help alot more.

This is true but the actual track tire is made differently. The carcass is stronger and able to maintain grip at a lower pressure. Try riding a street tire at 24 psi rear warm and you will know what I mean.

What pressure you run should be determined by the recommended tire pressure for the specific tire you are using (note: this is not the max pressure listed on the sidewall). But as a rule of thumb, you do not want to run a street tire below 32 psi, I would even say 34 psi front and rear.
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Old 12-16-2009, 07:42 PM   #8
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use your oem tires up asap.... and try a set of Bridgestones (BT-016).

I weigh 170 w/all gear and ride country roads.... fairly high speeds for street riding,and have about 32psi front and 30-31psi rear.

in another thread in this section i remember seeing a post from a tire engineer (from Bridgestone ?) who said something like.... "each tire has a specific psi for best performance" and what he suggested for BT-016 was a WARM psi of 34/34....

Doug Chandler has experience w/this tire on CBR600 and he recommended 32f/30r.
It feels WAY better than the oem dunlops cornering.

I played w/psi on the oems and got down to32-33f/35-36r before worn out.not much improvement in feel
IMO w/hindsight i would bin the oems. or ride them square w/out pushing them too much.

currently have 8k miles on my 09. get about 3.5k miles on a rear w/ BT-016s.
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Old 12-16-2009, 07:44 PM   #9
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Also I am a Newb.... so maybe this is not useful for your purposes!
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Old 12-16-2009, 07:48 PM   #10
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^^^ are those temps you listed warm or cold?
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Old 12-16-2009, 10:27 PM   #11
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Quote:
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^^^ are those temps you listed warm or cold?
temps or psi?
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Old 12-16-2009, 10:39 PM   #12
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Tyre pressure should be measured when tyres are cold
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Old 12-17-2009, 01:48 AM   #13
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temps or psi?
My bad, I let my mind get ahead of my fingers...
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Old 12-17-2009, 10:49 AM   #14
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32fpsi/30rpsi (cold) should give you something like

34psi for the warm/running psi for both front and rear..... rears get more heat buildup...
which increases psi.
take your tire guage w/you and check/adjust psi after 20-30 min of riding at normal pace.
only know this applies for BT-016
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Old 12-25-2011, 08:56 AM   #15
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Talking Pressure Caps

I bought some valve stem caps that show the pressure number and turn red if pres gets lower (leak) and green if tire pres is optimal. Local bike shop.

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Old 12-25-2011, 09:04 AM   #16
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Quote:
Originally Posted by BackStreet View Post
I heard tires have an ideal pressure and what you want to do is ride, check the pressure, and increase or decrease 1/2 the difference at a time.

Ideal for max grip may be closer to 36psi. Don't hit any pot holes or ride two up.

For max tire life and "street" handeling may be around 42-44.

Your way may depend too much on the road temp heating the tire for 10% increase.

What do you racers run when the tire is hot?
Every tire has a different range they should be in, you can't give a generic answer like that.
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Old 12-25-2011, 09:15 AM   #17
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A smart guy told me for ever 10c of heat your tyres gets, it raises 1psi. I run 39 front and rear. Any less and it feels sluggish.
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Old 12-25-2011, 09:23 AM   #18
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Run nitrogen and you'll keep constant pressures. The rest of the nitrogen stuff is pretty much snake oil but the lack of humidity, reduced corrosion and constant pressures are real.
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Old 12-25-2011, 01:35 PM   #19
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I run my Dunlop Q2 at 32F and 34R on the street cold for aggressive twisties. On the track I always ask the Dunlop rep what psi to start at for the conditions. I still haven't been able to find info on what the prime operating temp for this tire should be though. Anyone know what that is supposed to b?
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Old 12-25-2011, 05:31 PM   #20
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I run my Dunlop Q2 at 32F and 34R on the street cold for aggressive twisties. On the track I always ask the Dunlop rep what psi to start at for the conditions. I still haven't been able to find info on what the prime operating temp for this tire should be though. Anyone know what that is supposed to b?
I was told 30 at the track. I ran my Q2s at 29-30 at the track.
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Old 12-25-2011, 05:49 PM   #21
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Every tire has a different range they should be in, you can't give a generic answer like that.
I don't think he can hear you X. That comment was from 2004.
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Old 12-25-2011, 08:54 PM   #22
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This is true but the actual track tire is made differently. The carcass is stronger and able to maintain grip at a lower pressure. Try riding a street tire at 24 psi rear warm and you will know what I mean.

lol i rode my friend's f4i and he had something stupid like 22-24 psi in his rear (idk why this kid even has a bike) and i was sliding all over the place, very uncomfortable. i eventually checked his tire pressures and was like
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Old 12-25-2011, 09:05 PM   #23
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I've run my Q2's at 29 both and 30 psi cold both depending on conditions at the track. Still not sure what the optimal operating temp warm for the tire is though?
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Old 12-26-2011, 12:34 AM   #24
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i found this super helpful... in short there is a base pressure you should work off, adjust suspension acordingly and then vary your tyre pressure to suit your requirement, stability or traction... and revisit suspension...

http://forums.superbikeschool.com/in...opic=2536&st=0
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Old 12-26-2011, 07:17 AM   #25
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lol i rode my friend's f4i and he had something stupid like 22-24 psi in his rear (idk why this kid even has a bike) and i was sliding all over the place, very uncomfortable. i eventually checked his tire pressures and was like
Depending on the tire, he could have been right. Power 1s, D211s, and BT-003s all recommend a cold pressure of 22-24 in the rear.
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Old 12-27-2011, 12:11 AM   #26
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Wow, great link. So much good info there. Thanks
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Old 12-27-2011, 12:31 AM   #27
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What about the OEM qualifiers?
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Old 12-27-2011, 10:58 AM   #28
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oem is NOT a great tire......

got down to 36/34 before i gave up on them....

you can get Bstone bt -016 for about 210 bucks/set now from some supplier to this forum.........
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Old 12-31-2011, 08:57 PM   #29
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Tried to search but never got a great answer, wats the consensus on stock qualifiers? I'm a noob at the track and want to know optimum cold pressures. I know they suck but they are still relatively new so wanna put em through their paces. Thanks for the input.
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Old 01-01-2012, 12:12 PM   #30
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So, I wanna know too
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