Run Flat Versus Standard Tyres ?

Discussion in 'Off-Topic Discussion' started by HarryS, Sep 6, 2015.

  1. HarryS

    HarryS Eternally Optimistic Gardener

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    Mrs H has a Mini Cooper fitted with run flats on each corner.
    Now I hear that RFs do give a rather hard ride is it better to change to standard tyres?
    The mini does have a hard suspension and they are low profile tyres , the ride is a tad hard for my old bones :old:

    TIA
     
  2. Fat Controller

    Fat Controller 'Cuddly' Scottish Admin! Staff Member

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    Changing to normal tyres will give some benefits to the ride quality without doubt, however you need to bear in mind that doing so would be declarable to your insurance company as it would be classed as a modification on a technicality. Any insurer worth their salt wouldn't penalise you for changing, but you never know....

    Apparently, of the run flats, Dunlop are the tyre of choice..............
     
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    • Val..

      Val.. Confessed snail lover

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      I hope you have a nice soft cushion for Molly!!! :heehee:
       
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      • Scrungee

        Scrungee Well known for it

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        Does that mean you don't have a spare wheel?

        My latest car didn't have a spare as standard, so I bought both a 'space saver' (wouldn't be an issue with a mini) plus a full size spare (I've had 2 punctures over 24 hours on a Bank Hol weekend and don't want that inconvenience ever again).
         
      • HarryS

        HarryS Eternally Optimistic Gardener

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        No spares are issued when you are fitted with RFs . Really don't think we could find room for one . We are having std radials fitted on each corner this weekend. With a tyre inflating kit and the RAC and a bit off luck , we should be OK .
        My Ford C-Max did not have a spare , after 8 years I wonder if the inflating kit is still OK ?
         
      • Marley Farley

        Marley Farley Affable Admin! Staff Member

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        Hmm don't forget you may have to re-program the onboard computer.. I am running Goodyear RFs on my Cooper Estate and it took a while for the computer to accept the changes @HarryS ..
         
      • HarryS

        HarryS Eternally Optimistic Gardener

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        Hmmm , you got me there @Marley Farley :scratch: How does the tyre type effect the computer . Is it the over complicated BMW service intervals ?
         
      • pamsdish

        pamsdish Total Gardener

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        My new old Mini Cooper has RFTs, never had anything to do with them prior, first time out the dash warning light came on, had to look in manual for what it was, you can drive on them for so far at around 50 mph, had a good look, non appeared deflated, so came home approx 5 miles, decided to drive to my garage, yes that one, his `prentice, checked all round, put in air to make all 32psi, non were low/deflated, came home and left it, next day light still on so text my daughter for help, new rear tyre recently fitted and the valve might be playing up, hold button near handbrake till orange, then it will go out, done that no problems since.
         
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        • Marley Farley

          Marley Farley Affable Admin! Staff Member

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          I really don't know if it will upset the computer or not @HarryS but be prepared for it as I had a similar problem to Pam.. Seems very sensitive.. I still Have the RFs though..
           
        • Fat Controller

          Fat Controller 'Cuddly' Scottish Admin! Staff Member

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          It is to do with the TPMS @HarryS - the car measures the pressure in the tyre by sensing the flex/compression in the body of the tyre, and the runflats have harder sidewalls meaning they flex less than a standard tyre. If you replace the runflats with standard tyres, the ECU might construe the increased flex in the tyre as a deflation/under-inflation and will throw up a warning.

          This can usually be sorted by making sure that the tyres are at the correct (cold) pressures and then recalibrating the ECU, and there should be an instruction in the owners handbook as to how to do so.

          On the bright side, if you change from runflats to normal tyres, the ride should improve a bit
           
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          • pete

            pete Growing a bit of this and a bit of that....

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            Nothing to do with run flat tyres, but I need to get a rear tyre looked at, every two weeks I get a warning to check tyre pressures, its the same one all the time.

            I just pump it up and reset the deflation warning.

            As I understand it, it works via the ABS?
            Senses the difference in tyre circumference or some such thing, when it starts to go down.

            Just guessing its similar if you change types of tyre, ie, to run flat, or vice versa.
             
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            • HarryS

              HarryS Eternally Optimistic Gardener

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              Thanks FC so that's how the clever tyre pressure thing works - always wondered how . When we get the new tyres fitted , I am sure that I can reset the computer. :dbgrtmb:
               
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              • HarryS

                HarryS Eternally Optimistic Gardener

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                Well we changed to standard tyres this weekend , and the ride is great now :blue thumb: Not really a fair comparison to runflats , as the front nearside was egg shaped . This caused the wobbly drive .
                 
              • Fat Controller

                Fat Controller 'Cuddly' Scottish Admin! Staff Member

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                Ah, so it will feel ten times better then! Bear in mind that new tyres are a bit skittish for the first wee while, especially in the wet, so go careful :)
                 
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                • pete

                  pete Growing a bit of this and a bit of that....

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                  An egg shaped tyre??
                  Blimey.
                   
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