What I Learned About Tire Pressure This Week ...

[PhiSig1071]

Plus you should start with a baseline hot psi and go from there. The manufacturer recommends 28 cold. Running a session and checking your temps will give you a baseline hot psi to work from.

Who the hell are you anyway? I haven't seen many contributory posts of yours recently. Do a little research before you decide to call someone out. Rocalotadouche.

[Jim Moore]

My math guy is going to the Code school in April. Just for fun he sent the query to the school. The head mechanic at the school wrote back that they adjust their tire pressure 1 psi per 10 degrees as the day heats up, just like my friend calculated. Turns out math IS your friend!

[Niner1000RR]

Originally Posted by Jim Moore

My math guy is going to the Code school in April. Just for fun he sent the query to the school. The head mechanic at the school wrote back that they adjust their tire pressure 1 psi per 10 degrees as the day heats up, just like my friend calculated. Turns out math IS your friend!

My problem is how does this allow for YOUR (the riders) influence on the pressure change?

[AeroRamer]

You PEOPLE all sound like PRIUS owners. Would it be funny if there was a Prius Forum out there talking about this same topic?

...wait for it...wait for it...I want to go fast on my Prius so I need to adjust my tire pressure forum.com

[X-Man]

If it was as simple as math, well then I guess everyone would be running the exact same temps for the same tires no matter what.

This thread is getting old.

[AeroRamer]

IMO, I do not like to rely too much on the 1 PSI/10° F relationship or relying on one cold tire pressure readout per day. That I’m sure works well as a starting point with no stresses been applied on the tire but depending on the rider’s ridding style tire pressures may defer from other riders, cēterīs pāribus. Hey, if it works for the military and comercial aircraft it should work for us, right?

From the attached PDF article:

“Michelin has found that as a general rule, a temperature change of 5°F (3°C) will result in a tire pressure change of approximately 1%.

Everything aside, I personally like the idea of checking the tire pressure after returning from a track session and adjusting accordingly. That, considering also that the pressure may drop somewhat by the time I get to the paddock and check.

Heck! Now that I think about it, how come it was possible to calculate the exact trajectory and amount of fuel needed for Neil to ride and park the Eagle and we cannot agree with a 1-5 PSI differential?!

Anyway, I will keep checking my tires every now and then. It ain’t take to lang, ya’know. :neeb:

[Jim Moore]

Originally Posted by Niner1000RR

My problem is how does this allow for YOUR (the riders) influence on the pressure change?

That's a good question. I'm still puzzling over that one. I think maybe it doesn't matter for the novice and intermediate guy, because he's not approaching any limits. In any event, it's someplace to start.

[Jim Moore]

Originally Posted by X-Man

If it was as simple as math, well then I guess everyone would be running the exact same temps for the same tires no matter what.

This thread is getting old.

Pete,

I really appreciate your inputs to my threads. Your riding advice has been invaluable.

I don't know why you're not digging this thread. You think it's better to check the pressures hot. I get it. Unfortunately, in this case, the manufacturer gives cold pressures. With that in mind, what pressure do I check for hot? How do I know if that number is right?

[Niner1000RR]

Originally Posted by Jim Moore

That's a good question. I'm still puzzling over that one. I think maybe it doesn't matter for the novice and intermediate guy, because he's not approaching any limits. In any event, it's someplace to start.

That's a good comment, but not such a good approach. If you want to stay as a novice then it's ok to do what a novice does.

But ultimately the goal is to become better, safer and faster. That being the case, accuracy and consistency is more important than ANYTHING! Whether it's tire pressures, suspension settings, or braking markers.

You must be consistent both your testing and applications of these methods.

You can't use one method because your a novice, then once you get bumped you change your methods now...

Originally Posted by Jim Moore

Pete,

I really appreciate your inputs to my threads. Your riding advice has been invaluable.

I don't know why you're not digging this thread. You think it's better to check the pressures hot. I get it. Unfortunately, in this case, the manufacturer gives cold pressures. With that in mind, what pressure do I check for hot? How do I know if that number is right?

Hot pressures are determined per tire. Wait, I should probably go check what tires you have... lol

[PhiSig1071]

Originally Posted by Jim Moore

My math guy is going to the Code school in April. Just for fun he sent the query to the school. The head mechanic at the school wrote back that they adjust their tire pressure 1 psi per 10 degrees as the day heats up, just like my friend calculated. Turns out math IS your friend!

As an aside the Code School organized the S1000RR trackday I rode in. They are switching over to all ABS/TC equipped S1000RR's for the school. Your friend will have a BLAST, that bike is amazing. If you want to see one in person, stop by the shop sometime soon. (Not quite yet, but soon!)

[X-Man]

Originally Posted by Jim Moore

Pete,

I really appreciate your inputs to my threads. Your riding advice has been invaluable.

I don't know why you're not digging this thread. You think it's better to check the pressures hot. I get it. Unfortunately, in this case, the manufacturer gives cold pressures. With that in mind, what pressure do I check for hot? How do I know if that number is right?

Jim, here's the deal and if I was running the Michelins this is what I would do, if they give you a cold temp, usually means they expect a 5psi increase, so hot you should be running my guess would be 33-35psi frt and 27-28psi rear.

There is more discussion on this then you would imagine here - WERA BBS Linky....

Don't think you find any of the racers discussing mathematical equations.....

[TerrySchiavo]

What do you get with a cross between a Beautiful Mind and Forrest Gump? :D

[Jim Moore]

Originally Posted by TerrySchiavo

What do you get with a cross between a Beautiful Mind and Forrest Gump? :D

I don't know, but your avatar freaks me out.

[Jim Moore]

Originally Posted by PhiSig1071

As an aside the Code School organized the S1000RR trackday I rode in. They are switching over to all ABS/TC equipped S1000RR's for the school. Your friend will have a BLAST, that bike is amazing. If you want to see one in person, stop by the shop sometime soon. (Not quite yet, but soon!)

Yeah, he's very excited. When do you guys start giving test-rides?

[PhiSig1071]

Originally Posted by Jim Moore

Yeah, he's very excited. When do you guys start giving test-rides?

We got our letter of intent from BMW today. We are officially BMW motorcycles of Jacksonville. The goal is to be totally up and running by May 15th. The BMW demo program is amazing, so I'm fairly sure we will we will have demo bikes. However, I doubt we will be demo-ing the S1000RR

[Jim Moore]

Congratulations. That's great. That means I won't have to mail-order parts any more. Sweet!

[PhiSig1071]

Originally Posted by Jim Moore

Congratulations. That's great. That means I won't have to mail-order parts any more. Sweet!

It's pretty fucking cool.

That means next time we go lane-splitting I might be on a GS too.

[Jim Moore]

Originally Posted by PhiSig1071

It's pretty fucking cool.

That means next time we go lane-splitting I might be on a GS too.

It's the mack-daddy for lanesplitting.:roflwerd:

[TerrySchiavo]

Originally Posted by PhiSig1071

... However, I doubt we will be demo-ing the S1000RR

Uh... there isnt anything else worth riding in the lineup.

[TerrySchiavo]

Originally Posted by Jim Moore

I don't know, but your avatar freaks me out.

the answer... this thread...lol.

Its cool you turned an otherwise mundane topic into a word problem.

[jstr66]

Originally Posted by Jim Moore

Pete,

I really appreciate your inputs to my threads. Your riding advice has been invaluable.

I don't know why you're not digging this thread. You think it's better to check the pressures hot. I get it. Unfortunately, in this case, the manufacturer gives cold pressures. With that in mind, what pressure do I check for hot? How do I know if that number is right?

Heres something you can do as a novice (novices usually have shoestring budgets and limited pit crew so whatever can be done cheaply and accurately still helps the novice): DO set the tires according to mfg recommendations but as soon as you come back in, check the tire pressures again and write them down. Checking pressure should be the first thing you do when you hop off the bike since it will be most accurate then. Also write down how you felt about the handling/grip. This way, you will know exactly how your current riding is adding to the tire pressures and can set a warm pressure baseline from which to make adjustments. As the day warms up, you can still add/remove pressure according to changes in ambient temperature but always make sure to check your warm pressure against your new personal baseline warm pressure (found above) each time you come back in so you know what affects any adjustments have made. Most mechanics start out with a good set of wrenches and screw drivers and most grassroots race teams start out with that, a stop watch, and pencil and paper. You'd be amazed what you can learn through simple study and trial and error.

[X-Man]

Jim, just swapped emails with a good buddy of mine who used to race AMA and now is just club racing out of Phoenix, AZ, he's running Michelin's right now but since they haven't paid any of their contingency money since late last year, he'll probably be going back to Dunlop's.

This is what he had to say.....

"I run DOT A in the rear until it gets hot like over 85 degrees then a B, run 1246 slick front then for the supersport races a V front. We have been playing with temps and seem to finding out that Michelin gives you cold temp and that seems to work. I think it is because the sidewall is so freaking stiff. We have been setting cold pressurs and are playing with the hot temps. Found out we have to check the tire temp to make any adjustments on the hot pressure

Anyway, we run 29 cold and 33 hot in the 1246 1 lb higher in the DOT
depending on conditions we run 20-22 cold in the DOT rears"


If you want to continue running Michelin's, you may want to get a pyrometer to measure your tire temps.

[Jim Moore]

Thanks. I appreciate it.

[X-Man]

Jim, here ya go, nice thread on BBS for you. The racer Tom Savoca that the OP posted about is a buddy of mine who I was getting you info from....
BBS tire thread linky...

[Jetblast10]

Metzler.



glad I could help.