Martyn Vann - Warwickshire AO Posted June 16, 2021 Share Posted June 16, 2021 9 hours ago, maurici said: you can't legally have one of each type However, mixing run flat and standard tyres on an axle or front to rear is not an MOT failure! Quote Link to comment Share on other sites More sharing options...
Mole Posted June 17, 2021 Share Posted June 17, 2021 I have run flats on my m sport 1 series.. and yes the ride is harsh..so much so trying to push a radio button is difficult on a normal back road.. but never got round to changing all tyres as don't do many miles.. and as I have had had a couple of punctures always thought the benefit of run flat is worthwhile.. A couple of weeks ago I went for a day out to a town about 40 miles away and the low pressure warning light came on.. I ignored it parked in town and went shopping etc..less than two hours later I went to drive away and the tyre noise sounded just like a normal tyre when totally flat. I stopped and checked and zero pressure and the side wall was quite collapsed.. After speaking to two tyre companies both said would be at least 24 hrs for a new tyre plus they could not mend ANY puncture on a run flat! But could not justify why.. only that it was the manufacturer's guidance.. So in the end I found a garage and tried putting 50 psi in, but could hear the air leaking out.. In the end decided to drive home at 40mph for the 40 miles.. the tyre made it ok although was running really warm.. went to my local fitter who said he would have repaired it no problem.. except it had blown on the shoulder and it looked like it had just let go rather than a puncture! So in one way good I could drive home as it was a run flat however if it had been an ordinary tyre then I guess I could have bought a new tyre same day.. Agree the noise and everything is poor and for sure if doing more miles would definitely have swopped... Quote Link to comment Share on other sites More sharing options...
maurici Posted June 17, 2021 Author Share Posted June 17, 2021 On 16/06/2021 at 07:22, Ian Kinder (Bagpuss) - Joint Peak District AO said: Some tyre experts suggest the stiffer sidewalls of the run flats are parts of the suspension effectively. Hence in theory you should possibly change the springs and shocks if running on non-run flats. I'm sure @DamperMan will have some good input to this topic. @Mole a few notes about this: A run flat can be repaired just as any other tyre IF it has not run flat. Ie, you spot a nail, and repair it straight away before you run with the flat tyre. A professional fitter should not repair a runflat if it arrives flat at the workshop. No ifs, no questions. Is a NO NO. To avoid that, a tubeles repair kit should allways be in the boot... they are idiot proof to use and will save you for a few days till you get hold of a new tyre... (or if you are cheap as me, may last forever). https://www.amazon.co.uk/dp/B072JSXMHN/ref=cm_sw_r_cp_apa_glt_fabc_APJBDJCSC09JZDAKJHA4 this is the one i use. Professional quality tools for once. Also, one of this can be removed by a fitter and repair it with a mushroom style plug(as should be done) without damaging the tyre. The only advantadge of the runflats is that they will get you out of the motorway, but honestly, with a 1600kg car you can't drive in one like "nothing happened". Quote Link to comment Share on other sites More sharing options...
XTR2Turbo Posted June 17, 2021 Share Posted June 17, 2021 As far as I am aware M cars don’t get runflats Quote Link to comment Share on other sites More sharing options...
Mole Posted June 18, 2021 Share Posted June 18, 2021 Good info Maurici, in fact one of the fitters said that with the run flat it was more difficult to see if the side wall was damaged I think cars and no spares can be an issue generally.. one of the guys who works for me had a puncture and only the can of tyre sealant and compressor.. it failed to seal the hole.. luckily he was near home and went and got Jack etc and took wheel off and took to tyre fitters.. Would have been different if he was stuck in the middle of nowhere with no mobile signal! Quote Link to comment Share on other sites More sharing options...
Ian Kinder (Bagpuss) - Joint Peak District AO Posted June 18, 2021 Share Posted June 18, 2021 8 hours ago, XTR2Turbo said: As far as I am aware M cars don’t get runflats as in 'proper' M cars such as M3, M4 etc and not a 320D M Sport. Quote Link to comment Share on other sites More sharing options...
XTR2Turbo Posted June 18, 2021 Share Posted June 18, 2021 Yes m4 etc Quote Link to comment Share on other sites More sharing options...
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