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Bmw run flat

  • 17-10-2016 12:02am
    #1
    KwackerJack
    Registered Users, Registered Users 2 Posts: 2,126 ✭✭✭


    When looking at the pressure guide on my 2008 318D it quotes front 2 bar & rear 2.3 bar!

    This seems very low to me?


    Also can you recommend an all weather run flat tyre to suit?


Comments

  • #2
    jimgoose
    Registered Users, Registered Users 2 Posts: 20,195 ✭✭✭✭jimgoose


    1 bar is just under atmospheric pressure at sea-level, i.e. ~14.5 psi. So that's 29 psi front, 33 psi rear which is quite sensible.


  • #3
    Voodoomelon
    Registered Users, Registered Users 2 Posts: 9,661 ✭✭✭Voodoomelon


    2.3 and 2.5 on my 740 so sounds bang on for a 3 series.


  • #4
    KwackerJack
    Registered Users, Registered Users 2 Posts: 2,126 ✭✭✭KwackerJack


    I'm presuming this is obviously due to the tyre being run flat?


  • #5
    jimgoose
    Registered Users, Registered Users 2 Posts: 20,195 ✭✭✭✭jimgoose


    KwackerJack wrote: »
    I'm presuming this is obviously due to the tyre being run flat?

    What is?


  • #6
    KwackerJack
    Registered Users, Registered Users 2 Posts: 2,126 ✭✭✭KwackerJack


    jimgoose wrote: »
    What is?

    The low tyre pressure? Most cars I've had Audi, Mercedes, Porsche all had higher pressure ratings


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  • #7
    Cheensbo
    Registered Users, Registered Users 2 Posts: 2,704 ✭✭✭Cheensbo


    KwackerJack wrote: »
    The low tyre pressure? Most cars I've had Audi, Mercedes, Porsche all had higher pressure ratings

    Its more average than low IMO, the others you mention would be high


  • #8
    jimgoose
    Registered Users, Registered Users 2 Posts: 20,195 ✭✭✭✭jimgoose


    KwackerJack wrote: »
    The low tyre pressure? Most cars I've had Audi, Mercedes, Porsche all had higher pressure ratings

    Wouldn't call it low - I'm running 2.2 bar/32 psi all round on mine.


  • #9
    KwackerJack
    Registered Users, Registered Users 2 Posts: 2,126 ✭✭✭KwackerJack


    OK perfect I'll leave it at that so....just found out I've a puncture in the right rear tyre!

    Off for some early tyre shopping. Worst thing about run flats, can be repaired like a normal tyre


  • #10
    Blazer
    Registered Users, Registered Users 2 Posts: 17,473 ✭✭✭✭Blazer


    KwackerJack wrote: »
    OK perfect I'll leave it at that so....just found out I've a puncture in the right rear tyre!

    Off for some early tyre shopping. Worst thing about run flats, can be repaired like a normal tyre

    Newer ones can if the puncture is Smack in the middle and not the sidewall


  • #11
    KwackerJack
    Registered Users, Registered Users 2 Posts: 2,126 ✭✭✭KwackerJack


    Blazer wrote: »
    Newer ones can if the puncture is Smack in the middle and not the sidewall

    Good to know.....needs a rear set soon anyhow as only 3mm approx.

    I'll get someone to look at it and hopefully fix it until I can get a new set


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  • #12
    PGE1970
    Registered Users, Registered Users 2 Posts: 1,555 ✭✭✭PGE1970


    Slightly off topic and a little late but the best thing that I ever did to my e90 was to change to regular tyres.

    Cheaper and a much better drive. I have a can of foam and an air compressor in the boot.

    If you are changing 2 tyres, it might be a consideration for you.


  • #13
    bazz26
    Registered Users, Registered Users 2 Posts: 51,363 ✭✭✭✭bazz26


    It is not recommended to mix run flat tyres with standard tyres as they give different handling characteristics. Either replace all 4 with one type or the other in my view.


  • #14
    PGE1970
    Registered Users, Registered Users 2 Posts: 1,555 ✭✭✭PGE1970


    Sorry - meant to clarify: I replaced all 4 at the same time. The cost of 4 x regular tyres was still less than the cost of 2 x run flat.


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