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03-14-2008, 02:46 PM | #1 |
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How to determine correct tire pressures?!?!?
Since replacing my OEM M wheels/tires with aftermarket rims/tires I am unsure of the correct pressures to run. Ive tried 30psi as recommended by BMW for the stock setup, but does not feel right with the larger wheels/smaller tires setup.
Is there an equation to determine correct pressures??? The sidewall on the GoodYear Eagle F1 GS D3s recommends pressures under 50psi but of course Im not going to go near that #. Im tired of testing pressures every other day!!! Thanks to all with real information! --Chad
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03-14-2008, 03:37 PM | #2 |
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I usually go about 2-3 psi under the recommended max pressure of the tire. I have never had a blowout or any other pressure related problem.
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03-14-2008, 03:49 PM | #3 |
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I like high pressures for autocrossing as it prevents rolling of the sidewall, but driving that way all the time don't you get exaggerated wear in the center of the tread?
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03-14-2008, 04:59 PM | #4 | |
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I go 2psi above Manufacturer's recommendation COLD PSI btw.
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03-16-2008, 04:46 AM | #5 |
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30 rears, 33 front for me. Or as close as I can get, and as cold as i can manage. Its mostly personal preference, ride quality, handling, etc. Obviously you dont want to under inflate
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03-16-2008, 01:02 PM | #6 |
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It depends on a ton of factors...start with the recommended tire pressure for stock tires, and slowly increase it...If I were you I wouldn't go above 35 psi for daily driving...what are the complete tire specs?
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03-16-2008, 02:51 PM | #7 |
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I don't know about Goodyear, but you may want to research their site and see if you can find recommended tire pressures cold/hot. Michelin has recommended pressures for PS Cup tires at 25/27 psi cold front/rear with a target temp of 32/34 front/rear when hot and to change pressures in 2 psi increments when making adjustments. Having a tyre pyrometer also helps, but that is likely going overboard in your situation.
Check out Goodyear and see what they recommend. Probably a good place to start.
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03-17-2008, 06:00 PM | #8 |
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I usually do my tires when filling gas every now and then so I fill 2-3 psi under max when they are smokin hot
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03-18-2008, 10:50 PM | #9 |
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With past cars, I've typically gone 31/33 or 33/34 front/rear. I'd say to start with what's listed on your car's plate (& in the manual) and go from there. Generally, I check the pressure cold. If I've been driving, I assume a 2 psi increase from heat so I subtract whatever the pressure happens to be by 2 psi to figure out the cold temp pressure.
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03-18-2008, 11:33 PM | #10 | |
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03-19-2008, 12:34 AM | #11 |
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I've heard the -10% rule (i.e. 10% less than max stated on tire). I haven't tried it out on my ride, though.
I am currently running 33psi (F) & 35psi (R) on my Generals. |
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04-04-2008, 01:55 PM | #12 |
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I finally found that 34psi all around works best for me.... So much for some scientific mathmatical equation!
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04-04-2008, 03:22 PM | #13 |
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what about if you use nitrogen?
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04-04-2008, 04:20 PM | #14 |
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04-04-2008, 05:20 PM | #15 | |
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And I have no middle name, so make it trouble, rebel...whatever you like. I just re-read that thread...and i was stirring up trouble then too......lol!! Rosie
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04-04-2008, 11:22 PM | #17 |
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Hmm... I've been wondering this tire pressure thing for a while myself. I've heard figures from 34/38, F/R for stock 18's (staggered), or 32/35, or 30/32 for track, blah blah.....
i would think that with low profile tires, you would want a higher PSI as to avoid denting your rims on potholes. Then again, you risk uneven tire wear if you over inflate. I checked my tire pressure last week and it was at 30.5/34, F/R. Cornering had felt a bit soft so i inflated it back up to around 34/34 (non staggered setup). Stability seems to have improved, though potholes feel a little more jarring.
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04-06-2008, 09:12 PM | #18 | |
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I use the 31/33 psi for my snow tires (Michelin Alpin 2's) and, in the past, used 33/34 with Pilot Sports (PS1's)...although that was on my ZHP. I haven't had my coupe long enough to have the OE summer tires on for more than 2 weeks. I still got the snows on. General Exclaim UHP's? If so, how do you like them? I considered those but sidewall flex seemed to be a common complaint. |
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04-07-2008, 02:16 AM | #19 | |
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I'm pretty happy with them, and would probably do it again. I figured (at the time) that if they really did suck, then at least I didn't waste too much money (since they're dirt cheap). So far no complaints. |
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04-07-2008, 01:44 PM | #21 |
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Yes that is street driving... I have stock RFT tires. The Max is >50psi so I run a few under that usually. I guess I have always been taught to fill when the tires are warm and fill until it is close to the max psi.
Perhaps I'll drop it down another 5 psi (10%) and see how the ride is.
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04-08-2008, 02:00 PM | #22 | ||
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