If the load rating matches the car then you should run what the tyre recommends.
Just wondering what tyre pressures i should use for 225/30R20s?
They have the max pressure on the tyres but theres normally max 2 passengers in the car at once with a sub in the boot. I was thinking around the 34-36psi mark.
Would this be ok?
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not quite, ive always found that the lower side wall tyres like a bit higher preasure to get a bit of milage out of them, like my cousin is running 40+ pounds with his 22"s i ran 40 on my comodores 18"s back in the day and got 50,000k out of a set
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34ish is always around the mark!
awsome, thanks for that, i'll probs keep it at the 36-38 mark since some people are running at 40+
Another thing to note is that most people check their pressures at the servo with at least a few minutes driving. All the specs say to do it cold. So driving increases the pressure a few psi. If they feel warm to the touch and you fill to 38 you are probably really filling to 36? Can't find a better graph...
http://www.pirellityre.com/web/techn...l/default.page
digifish
This is correct.......however you need to observe for yourself on your individual car, how a certain pressure reacts in terms of uneven tyre wear and or longevity.
Very low profile tyres are best if inflated higher rather than lower.
If you ask tyre manufactures and fitters they'll tell you that 38-42psi is usually the case for a tyre with a 30 series profile.
I also have 225/30 R20's and run 40 psi - as I've found this to be optimum, the ride quality has not suffered as a result
My rides: 2004 Opel/Bertone TS Astra turbo convertible - 2012 Mercedes Benz C204 C Class coupe
Others: 2009 Honda City VTiL sedan - 2015 Fiat 500
I have 215/35 R17 and run 40, the recomended 35 seams to cause excess wear on the edges.
2003 Silver Astra SRi-T[CENTER]
- Electric Sunroof
- 3" Dump, 2 1/2" Flex, Hi-Flow Cat & Exhaust
- Custom Dyno Flash Tune (1 Bar)
- Bailey Dump Valve
- 136.2 KW @ 5800 RPM
- 278 NM @ 4100 RPM
- 14.088 1/4 @ 99.88 MPH
I agree with Mr T.
I'd get your decent Alignment shop to set the pressures for you. Preferrably if that alignment shop is involved in motorsport preparations.
Bugger teh ride comfort, even tyre wear and secondly performance is what I'm after. He set mine to 34-36ish (18's). havent touched them since, but am due for alignment check
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