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Lemonchili_x1
Posted on Tuesday, July 20, 2004 - 09:13 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I know it's summer up north, but it's getting colder here...
I've been discussing tyre pressures with a friend - during winter he runs lower pressures to try and get more heat into the tyres. I've been playing around with the idea, but not sure if I'm making it better or worse.

What do you do when it's really cold, or really hot? Up, down or leave them alone? (btw I'm talking about road riding, not track)
Thanks in advance,
lemonchili

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M1combat
Posted on Wednesday, July 21, 2004 - 12:47 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

In F1 they tend to lower the tire temps when the track is cold. It's more the pavement temp that you need to adjust for as I recall. I don't race IRL but I do a LOT of virtual racing with the finest simulators made.
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Lemonchili_x1
Posted on Wednesday, July 21, 2004 - 03:40 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Don't get me wrong, I'm no Valentino... so I'll rephrase my question:

Who uses the tyre pressures in the handbook? Who uses something different?

btw: Did anyone see the last lap of the German MotoGP? That was great racing!
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Easyflier
Posted on Wednesday, July 21, 2004 - 07:55 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

During the normal riding season I use the suggested pressures in the manual. Riding in temps under about 45°F I like to run 6-8 pounds less for short trips around town. Don't know if it makes any real difference but I feel like I'm getting better grip on cold pavement that way.
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Bomber
Posted on Wednesday, July 21, 2004 - 09:04 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I use the book pressures -- I checkled them against my long-term rule of thumb, and they wporked --

rule of thumb = pressure cold yields a 3 to 4 psi raise in pressure hot . . . . .

oh, Y2K MaDeuece, me, 220 or so geared up (which would make a difference)
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Midknyte
Posted on Wednesday, July 21, 2004 - 10:58 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I used the book pressures on a 50 degree day and landed on my azz. I run them 4 lbs under now, even in warmer weather.
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Lemonchili_x1
Posted on Wednesday, July 21, 2004 - 08:34 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Hmmm... Thanks for all your thoughts. I've been running as low as 8lbs under, but I think I'll put them a lot closer to the book, and just ride it for a while and get used to it...
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Firemanjim
Posted on Thursday, July 22, 2004 - 12:20 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Hey,Graham.What's a tyre???HaHa.
Changed sprocket yet?
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M1combat
Posted on Thursday, July 22, 2004 - 12:52 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I've noticed that when my front gets a little lower than I want it to be it will start following lines in the road. Especially when leaned over. I've tested it out many times just to make sure so I keep my tire above that threshold by about a pound. The rear I keep 1.5 to 2 above that.
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Midknyte
Posted on Thursday, July 22, 2004 - 01:42 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Just a note on running under pressured - if your [XB] picks up a wobble in the front, your pressure is too low.
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M1combat
Posted on Thursday, July 22, 2004 - 02:03 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I would agree with that, but if it persists as you raise the pressure, maybe check for cupping of the front tire? They seem to be pretty sensitive to that too.
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