Run flat tyres and the mot law

johnnyb44 · 30th September 2018, 08:57

Hi all and hope your well..
A good friend of mine is selling some unused continental run flat tyres for a bargain price. My car is in need of a new tyre and the Mot is not far away, so I was considered buying them, but where does the mot law ( if any?) stand. Obviously Rover 75 ,s where not fitted with these tyres when they rolled off the production line. Can a run flat tyre be fitted to our cars whilst the other three tyres "still be of ordinary standard tyres ;for mot purposes.
All the very best,
Johnny.

tourer · 30th September 2018, 09:19

Have you ever driven with run-flat tyres?
My BMW has Continental run-flats and they give a very hard ride compared to a 75. You will wonder where the thumping noise is coming from on poor surfaces.
Plus I would imagine you would need a matching pair of tyres on the same axle.

P-Nut · 30th September 2018, 09:23

Whilst legal I would avoid run flat flat, they are harsh and it will feel awful having a mis match

johnnyb44 · 30th September 2018, 09:28

Hi and thanks for replying. I've just been swotting up on the internet and cannot find much on the mot laws about mixing and matching them with standard tyres ,but as you say they are reported to be very harsh due to there stiffer walls. This alone puts me off them to be honest as the whole point of the 75 is it's refinement and forgiving ride qualities.

uk_dave&gill · 30th September 2018, 17:05

We bought a MINI recently with run-flats, and when one of them developed a slow puncture, I briefly considered switching to conventional tyres. However, after doing a lot of reading up, decided to stick with run-flats

This is quite useful information

Two key points are:-

Run flats must only be installed on a car which has TPMS/tyre pressure monitoring system. TPMS alerts the driver to a puncture so they are aware that they have a limited time to replace their tyre, and so they drive within the limits of their deflated tyre
As a general rule of thumb, you should avoid mixing different tyre types on a vehicle. This is also true of combining conventional and run flat tyres on a car – as their handling characteristics may differ, they should not be mixed on a vehicle.

Not worth the risk of mixing them, IMHO

Outlaw 41 · 30th September 2018, 17:11

If you changed all 4 the ride would be like everyone has said "harsh" but to only change 1 would unsettle the car which wouldnt fill you with confidence while pressing on .

johnnyb44 · 30th September 2018, 17:18

All good advice given and taken on board. Thank you all for giving the time to post your views. I shall leave them well alone and replace with more conventional tyres.
All the very best,
Johnny.

maxi_crawf · 30th September 2018, 21:16

Don't run flats have to be fitted to a wheel made for the purpose?

mh007 · 30th September 2018, 21:49

Quote:

Originally Posted by uk_dave&gill

We bought a MINI recently with run-flats, and when one of them developed a slow puncture, I briefly considered switching to conventional tyres. However, after doing a lot of reading up, decided to stick with run-flats

I bought a 2002 MINI for the other half a few years back.
Amongst other things, the first job was to ditch the run-flats for a set of new standard tyres.
The ride & road noise are a massive improvement to the point that it transformed the car.

gary t · 1st October 2018, 13:07

run flat tyres can only legally be fitting with cars fitted with tyre pressure monitors

30th September 2018, 08:57	#1
johnnyb44 I really should get out more....... Rover 75 Join Date: Sep 2013 Location: north wales Posts: 2,698 Thanks: 1,774 Thanked 902 Times in 507 Posts	Run flat tyres and the mot law Hi all and hope your well.. A good friend of mine is selling some unused continental run flat tyres for a bargain price. My car is in need of a new tyre and the Mot is not far away, so I was considered buying them, but where does the mot law ( if any?) stand. Obviously Rover 75 ,s where not fitted with these tyres when they rolled off the production line. Can a run flat tyre be fitted to our cars whilst the other three tyres "still be of ordinary standard tyres ;for mot purposes. All the very best, Johnny. __________________ Replaced pcv filter, springs, plenum spy hole mod,Bonnet cable divider mod. Wax oiled.Air con recharged. Auto box oil changed , Jules plenum guard fitted .Smoked wind deflectors fitted.S/S Compensator.Club Grill Badge kindly donated by Andyg2011..

30th September 2018, 09:23	#3
P-Nut Gets stuck in MG ZT 190+ Join Date: Nov 2012 Location: North Shields Posts: 561 Thanks: 143 Thanked 170 Times in 103 Posts	Whilst legal I would avoid run flat flat, they are harsh and it will feel awful having a mis match __________________ Approved food eater

30th September 2018, 09:28	#4
johnnyb44 I really should get out more....... Rover 75 Join Date: Sep 2013 Location: north wales Posts: 2,698 Thanks: 1,774 Thanked 902 Times in 507 Posts	Hi and thanks for replying. I've just been swotting up on the internet and cannot find much on the mot laws about mixing and matching them with standard tyres ,but as you say they are reported to be very harsh due to there stiffer walls. This alone puts me off them to be honest as the whole point of the 75 is it's refinement and forgiving ride qualities. __________________ Replaced pcv filter, springs, plenum spy hole mod,Bonnet cable divider mod. Wax oiled.Air con recharged. Auto box oil changed , Jules plenum guard fitted .Smoked wind deflectors fitted.S/S Compensator.Club Grill Badge kindly donated by Andyg2011..

30th September 2018, 17:05	#5
uk_dave&gill This is my second home .. Join Date: Feb 2007 Location: Town Posts: 4,166 Thanks: 1 Thanked 189 Times in 105 Posts	We bought a MINI recently with run-flats, and when one of them developed a slow puncture, I briefly considered switching to conventional tyres. However, after doing a lot of reading up, decided to stick with run-flats This is quite useful information Two key points are:- Run flats must only be installed on a car which has TPMS/tyre pressure monitoring system. TPMS alerts the driver to a puncture so they are aware that they have a limited time to replace their tyre, and so they drive within the limits of their deflated tyre As a general rule of thumb, you should avoid mixing different tyre types on a vehicle. This is also true of combining conventional and run flat tyres on a car – as their handling characteristics may differ, they should not be mixed on a vehicle. Not worth the risk of mixing them, IMHO __________________ Dave

30th September 2018, 17:18	#7
johnnyb44 I really should get out more....... Rover 75 Join Date: Sep 2013 Location: north wales Posts: 2,698 Thanks: 1,774 Thanked 902 Times in 507 Posts	All good advice given and taken on board. Thank you all for giving the time to post your views. I shall leave them well alone and replace with more conventional tyres. All the very best, Johnny. __________________ Replaced pcv filter, springs, plenum spy hole mod,Bonnet cable divider mod. Wax oiled.Air con recharged. Auto box oil changed , Jules plenum guard fitted .Smoked wind deflectors fitted.S/S Compensator.Club Grill Badge kindly donated by Andyg2011..

30th September 2018, 09:19	#2
tourer Posted a thing or two Rover 75 Tourer CDT Auto. Join Date: Oct 2011 Location: Long Eaton Posts: 1,342 Thanks: 30 Thanked 220 Times in 160 Posts	Have you ever driven with run-flat tyres? My BMW has Continental run-flats and they give a very hard ride compared to a 75. You will wonder where the thumping noise is coming from on poor surfaces. Plus I would imagine you would need a matching pair of tyres on the same axle.

30th September 2018, 17:11	#6
Outlaw 41 Loves to post MG ZT Join Date: May 2018 Location: Blackwood Posts: 315 Thanks: 244 Thanked 125 Times in 83 Posts	If you changed all 4 the ride would be like everyone has said "harsh" but to only change 1 would unsettle the car which wouldnt fill you with confidence while pressing on .

30th September 2018, 21:16	#8
maxi_crawf Posted a thing or two R75 Saloon Conn CDT SE, MG ZT190+ Join Date: Nov 2006 Location: Kingston-upon-Hull Posts: 1,960 Thanks: 823 Thanked 426 Times in 274 Posts	Don't run flats have to be fitted to a wheel made for the purpose?

1st October 2018, 13:07	#10
gary t Loves to post rover 75 connoisseur se v6 Join Date: Mar 2013 Location: brockworth Posts: 278 Thanks: 46 Thanked 23 Times in 20 Posts	run flats run flat tyres can only legally be fitting with cars fitted with tyre pressure monitors

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