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Drkside79
Posted on Wednesday, April 07, 2010 - 05:00 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Do you go by what the tire says or what the frame says? My Pirellis say something like 40 psi and the frame is in the mid 30s depending on the tire? I've been going with the fame but I was curious about your take?
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Dallasb
Posted on Wednesday, April 07, 2010 - 05:04 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Don't go by what the tire says. Use the numbers in your owners manual/frame.
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Froggy
Posted on Wednesday, April 07, 2010 - 05:11 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

I run about 45psi on all my Buells.
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Roysbuell
Posted on Wednesday, April 07, 2010 - 05:15 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Dallas why not the tire specs? thats what the air is going in. My tires take 42psi
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Roysbuell
Posted on Wednesday, April 07, 2010 - 05:17 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Froggy is that tire rating or your personal preference?
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Hogs
Posted on Wednesday, April 07, 2010 - 05:20 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

WoW thats seems Reallllly High
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Froggy
Posted on Wednesday, April 07, 2010 - 05:27 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

My preference. Beats me what the book or tires says (all running various Pirelli's.)
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Piotr12
Posted on Wednesday, April 07, 2010 - 05:35 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

No wonder you get such gas mileage! You're just "skimming" across the pavement! lol
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Greg_e
Posted on Wednesday, April 07, 2010 - 05:46 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Most older Pirellis required a couple extra pounds, not sure if it applies to newer styles. My 9R says 36 front and 39 rear (or something close to that). So far so good, it at least feels normal to me at those pressures.
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Fast1075
Posted on Wednesday, April 07, 2010 - 06:11 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

I run Corsa III's on my '04 12s....38 rear, 36 front...
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Bads1
Posted on Wednesday, April 07, 2010 - 06:13 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Wow!!!! way to much froggy.
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Freezerburn840
Posted on Wednesday, April 07, 2010 - 06:33 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

45psi is great! I dont have it in me to run that high of psi.
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Freezerburn840
Posted on Wednesday, April 07, 2010 - 06:35 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

38 rear and 36 front is good. Sometimes I go lower for canyon carving.
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Nobuell
Posted on Wednesday, April 07, 2010 - 07:25 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

I have Conti Road Attacks on my XT. I have always run the pressure specified in the manual (34 F and 36 R). After reading the posts, I checked the Conti website. For the Uly, they recommend 34.8 (2,4) F and 42.0 (2,9) R. I to wonder which is the correct pressure to run?

I may try the Conti recommended pressure to see how it feels.

Any comments (silly question)?
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Socalbueller
Posted on Wednesday, April 07, 2010 - 08:49 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

The pressure on the tire is the MAXIMUM pressure the tire is rated for. What is in the manual is a good starting point, worked most of the time for me. On the Michelin Road 2s I have now, the rear was sliding a little bit with 36 lbs so I lowered it to 34 and that seems to feel better.
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Sloppy
Posted on Wednesday, April 07, 2010 - 08:52 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Depends upon riding style, tire type and road conditions, but basically, heavy weight or high speeds = higher pressure.

Each person & tire will be different - I suggest taking a track day with a sponsored chassis guy. Spend $50 and he'll get you setup with adjustments and tire pressures.

Experiment and see what you like. But I've found the factory manual to be spot on to what the chassis guy recommended.
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Alchemy
Posted on Wednesday, April 07, 2010 - 10:14 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

When I first put on Metzler M3s I spoke personally with a Metzler tire rep. He said the M3 will lose about 1000 miles of wear life for every PSI below the max. This is not a hard rule but you get the idea. Running lower pressures impacts the tire life and I expect the MPG as well.

The rep said always follow what the tire company says and ignore the bikes manual unless your are using exactly the OEM tire.

From there, pressure adjustments can be made for the handling your desire. At the track the pressure will be quite different for instance. The Metzlers were pretty comfortable at 42 psi for me but YMMV.
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Babybuell
Posted on Wednesday, April 07, 2010 - 10:51 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

If I am fat, I mean really FAT, should I run a little bit more pressure than what the tire recommends?
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Littlebuggles
Posted on Thursday, April 08, 2010 - 02:09 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

As long as you are within the gross vehicle weight spec run the recommended pressure on the tire. Sooo... If you are really fat you might want to reconsider giving rides to your fat friends, stick with the skinny chicks. Gonna pop a tire that way.

Follow the spec on the tire. Don't you think the manufacturer of the tire knows what they designed into it better than you do? This shouldn't be a hard question. A pound or two may make a difference depending on climate or road conditions but remember the MSF teaches the most common reason for tire failure is due to improper inflation. (Generally too low, causing a tire to over heat). Don't over think this, a lot is riding on your tires.

Nobuell, I found the Conti Attacks handle much better at the recommended pressure on both track and street. No idea why they use a higher pressure than most, but they do, and I suppose they know why, even if I don't.

Ride safe guys.

Rant off.
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Ronin1
Posted on Thursday, April 08, 2010 - 08:25 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

I run 42 front and 44 rear.
And my mileage still sucks!
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Dallasb
Posted on Thursday, April 08, 2010 - 09:50 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

maxxis.com/MotorcycleATV/Motorcycle-Tire-School.as px}

amadirectlink.com/roadride/Riderresc/tires.asp
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Nobuell
Posted on Thursday, April 08, 2010 - 04:16 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Littlebuggles

I agree.

I double checked the Continental application guide on their website. They have different recommended pressure for the same tire size and type for different bikes. The listed pressure is not the tire maximum but is a pressure based on the tire for that particular motorcycle.

I believe the motorcycle manufacturers recommended pressure can only apply to the original tire provided. When using different tires, the tire manufacturers pressure listing must then be the default.

Now I will definitely change my pressure to Continentals listed pressure.
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Greg_e
Posted on Thursday, April 08, 2010 - 04:35 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Michelin didn't have a guide that I could find.
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Nobuell
Posted on Thursday, April 08, 2010 - 05:43 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Greg e

For Michelin, they have a tire fitment guide that can be downloaded. They say to use the motorcycle manufacturers recommendation.

There does not seem to be a clear recommendation from the tire manufactures.

Michelin - Use motorcycle manufacture data
Dunlop - Use motorcycle manufactures data but do not go below 36 psi rear and 40 PSI for heavier loads.
Continental - Use manufactures data if available otherwise use their fitment values.

There seems to be a lot of ambiguity. Most tend to recommend the highest pressure shown in your bike manual. Smells of a liability issues to me.

I still believe that the tire manufacturer has the best information based on their specific tire design. Tire technology constantly changes. It makes more sense to me that the bike manufacturer rating is good for the spec tire and just a basis for non OEM tires.

It's clear as mud to me now!
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