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18" Tyre Pressure

Discussion in 'VY Holden Commodore (2002 - 2004)' started by Mossman, Jul 27, 2006.

  1. Mossman

    Mossman New Member

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    I have had my 2003 VY now for a month or so i decided to check the tyre pressure on one of the digital tyre gauge only to find out the pressure in my 18 inch wheels (GIII Potenza 235/45/18) was 24psi:eek: I never really felt that they was underinflated, so i pumped them up to 38psi all round is that ok for 18" wheels its just that the opinions seem to be divided on here thats all?
     
  2. bennzy

    bennzy New Member

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    i asked works contact they use for there tyres and the guy said put 40 in them
     
  3. Shounak

    Shounak The Kicking Horse

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    I use 38psi.. But the outsides are wearing, so now I'm using 40 psi..
     
  4. Erik-the-Red

    Erik-the-Red Guest

    235/45/18? that's strange, i thought mine were the correct size and they're 235/40/18
     
  5. Puggle

    Puggle New Member

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    wow the placard on my drivers door says 33 - 36psi depending on speed and load. And my 18's are standard issue.

    I've since started going 38 all round, they always look a little underinflated (hard to tell with low profiles huh). Been too scared to go any higher (infantile fear of the tyre exploding in my face...)

    Can anyone confirm the safest upper limit? I want to get them higher for better handling, but not so much that they wear in the middle, or blow up in my face.
     
  6. MaN|aC

    MaN|aC New Member

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    38 psi is fine for 18's, any more higher psi you will feel a rougher ride
     
  7. naf33n

    naf33n go

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    usually the recomended max pressure is about 50psi. all tyres say it on the side wall some where but around the 40 mark is good. most people pump theres up a little more on high trips as the car rolls easier and uses less fuel
     
  8. ashtray1

    ashtray1 New Member

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    i have falkens 235/40/18 and mine say max load is 44psi but the guys at tyrepower said to pump it to 50psi cause the will last longer
     
  9. vy1sv8

    vy1sv8 New Member

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    50 psi :my: , i wouldnt go pumping it anywhere past 42 really as they heat up quite alot when you get going thats all
     
  10. Conceive This

    Conceive This New Member

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    I Work for beaurepaires
    and i have done plenty of Tyre technology coarses and this is what ive found.

    NOTE: First off remember the tyre placcard on the vehicle is factory fitted
    this is the comfort level prescribed by the vehicle manufacturer and is not tyre rated

    15'' and 16'' pasanger tyres = 30-32psi

    17'' Proformance tyres= 32-35psi

    18'', 19'' and 20'' Proformance tyres= 34-36psi

    work utes and vans pressure set to 40psi

    Now of coarse this is only a guide if you feel its a bit sloppy
    you are able to increase these measurements

    NOTE: NEVER EXCEED MAX TYRE PRESSURE (located on the side of the tyre)
    this is usualy but 50psi

    Remember more pressure gives you greater steering response tho can stress the tyres integrity, also there is less give if you hit a pot hole this could cause tyre sepperation (sidewall bubbles) or damage your rims..


    NOTE: if you are travaling log distances ie. interstate all measurements should be increased by 4psi this also aplies to fully laden vehicles.

    With 4WD

    all tyre pressures should be set to 40psi depending on your comfort


    Now all these measurments should give you maximum life and proformance
    from your tyres...

    SAFE MOTORING...
     
  11. Aus78Formula

    Aus78Formula Member

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    Thread dig for good info listing....

    Spelt Beaurepaires correct but struggled with performance, placard, courses, separation, measurements, traveling, long and passenger, go figure.
     
  12. bob builder

    bob builder Member

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    I used 6 sets of 18s on a ve sedan (150000kms) and always ran 40psi and the tyres seemed to wear flat the across the whole width of the tyre
     
  13. Jxfwsf

    Jxfwsf Well-Known Member

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    He's a tyre fitter, not a rocket scientist/brain surgeon.
     
  14. gossie

    gossie Well-Known Member

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    I check my 18s to 40 at each fill up. Cold car next morning tyres are just under 39 with my own gauge. Wear pattern is flat. Handling is good.
     
  15. commodore665

    commodore665 expat Saffa

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    same here , run Bridgestones on the Commodore @ 40 PSI on 18" rims wear even across the tyre , on the Alfa Romeo , Michelin's @ 36-38 PSI , 17 " rims same deal even wear across the tyre .
     
  16. CONROD

    CONROD Member

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    Yep, always run 42psi in the front, 40psi on the rear. Checked when cold, Rotate every 5000 km.
    Agree with GOSSIE, 40 seems to be the sweet spot for longevity, wear rate :blah blah:
     
  17. commodore665

    commodore665 expat Saffa

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    On our patrol cars ( NZ Police ) get almost maximum inflation running Bridgestones Potenza or Turanza , depending on the car , highway patrol or general duties , almost all nitrogen filled .
     
  18. XUV

    XUV Member

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    36psi all round and 40psi in the rear if it's loaded.
     
  19. Noeleter

    Noeleter Active Member

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    Surprised NZP would use nitrogen based on cost and availability and probably minimal benefits for most of the fleet usage.
     
  20. Commy

    Commy New Member

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    Adjust your pressures to suit your car/rims, how you drive it and roads your driving on. Personally for 18's, 42 front 36-38 rear, i tend to drive it like it's stolen at times which gives the outer edges a workout. Raining i drop to around 36 front 34 rear for. Best to check wearing / handling.
     

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