Run flats
- Thread starter greg1953
- Start date
PinkPineapple44
Member
I've been running non run flats on the front and run flats on the rear for about 6 months/7000 miles no problem. Rears are finally getting swapped out in a couple of weeks 
No no no never mix runflats with normal tyres, occasionally some do but it affects the handling and if the worst should happen I'm sure your insurance would take a dim view.
Handling will be all over the place. Run flats are a very stiff tyre so mixing that with a softer compound non run flat the car will feel out of balance
This is an extract from National Tyres.
Mixing Conventional Tyres with Run Flat Tyres
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.
Makes sense to me
Mixing Conventional Tyres with Run Flat Tyres
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.
Makes sense to me
GBZ4 said:This is an extract from National Tyres.
Mixing Conventional Tyres with Run Flat Tyres
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.
Makes sense to me
But also take into account this is written by a company that sells tyres.
Change all four, not two = More profit
Nick9one1 said:GBZ4 said:This is an extract from National Tyres.
Mixing Conventional Tyres with Run Flat Tyres
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.
Makes sense to me
But also take into account this is written by a company that sells tyres.
Change all four, not two = More profit
This is true but you’d never mix ‘cross-ply and radial’ tyres would you :?
Ran standard tyres on the front of my e90 with run flats on the back and although not ideal, It ran fine. Ditched the run flats as soon as they were 2.5 mm. I don't see that they could affect the car too much as essentially they just have a slightly stiffer sidewall. Unless of course you are ragging it around a track etc.
GBZ4 said:Nick9one1 said:GBZ4 said:This is an extract from National Tyres.
Mixing Conventional Tyres with Run Flat Tyres
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.
Makes sense to me
But also take into account this is written by a company that sells tyres.
Change all four, not two = More profit
This is true but you’d never mix ‘cross-ply and radial’ tyres would you :?
Remember my first car a 1963 ford anglia estate radials on the rear cross-ply on the front and all remoulds !!!
Those were the days. Not
If you drove a modern car all times at the speed limits in the uk i would find it hard to believe that braking , cornering or safety would be hampered running mixed runflat / non runflat paired on different axles .
Yes of course it will always be better to run 4 of the same year , depth , make + model tyres but its far more sketchy running the wrong pressures .
Worn wiper blades through dark winter months is probably more dangerous
Yes of course it will always be better to run 4 of the same year , depth , make + model tyres but its far more sketchy running the wrong pressures .
Worn wiper blades through dark winter months is probably more dangerous
Nick9one1 said:Continentals recommendation:
To me it reads.. not ideal. But you can.
Please bear in mind that runflats are a different type of construction to a normal pneumatic tyre.......the above does not apply because it relates to pattern, brand, load & speed index but not construction !
A runflat is substantially heavier, has stiffer sidewalls and totally different handling characteristics............if you don't want to listen to tyre company's because there is the perception that they are all trying to rip people off ask BMW what they think :wink:
Tyreman said:
That old one
" Bmw " " the car company that never gets it wrong " 
the company that thinks 18k is ok for service intervals on performance cars
the company that thinks fitting runflats is acceptable on a 330bhp 2 seater sports car
( but never on ///M cars :wink: ) the company that fits 255 30 19 runflats onto 9j wide alloy rims that then split due to oe PSI of 44
) the company that fitted roof motors where they get flooded
Once you start believing the big names & never question then its game over , they aren't infallible by a long way
mr wilks said:Tyreman said:
That old one
the company that thinks 18k is ok for service intervals on performance cars
the company that thinks fitting runflats is acceptable on a 330bhp 2 seater sports car
the company that fits 255 30 19 runflats onto 9j wide alloy rims that then split due to oe PSI of 44
Once you start believing the big names & never question then its game over , they aren't infallible by a long way
I don't have to question anybody on this one, after over 30 years experience in the tyre industry and knowing the differences in construction and the effects on the "unsprung weight" you absolutely should not mix them..........end of story.......anyone with a different view to this is simply wrong !
Tyreman said:mr wilks said:Tyreman said:
That old one
the company that thinks 18k is ok for service intervals on performance cars
the company that thinks fitting runflats is acceptable on a 330bhp 2 seater sports car
the company that fits 255 30 19 runflats onto 9j wide alloy rims that then split due to oe PSI of 44
Once you start believing the big names & never question then its game over , they aren't infallible by a long way
I don't have to question anybody on this one, after over 30 years experience in the tyre industry and knowing the differences in construction and the effects on the "unsprung weight" you absolutely should not mix them..........end of story.......anyone with a different view to this is simply wrong !
As with most things tyre / wheel related there are so many variables out there to say 100% that it would be any more dangerous than the car behind you or in front of you .
One might be a £500 Peugeot 106 with 4 non runflats all different brand with mixed asymmetric & directional ranging from 2mm to 8mm & all different pressures . Op on the other hand with his prestige german quality built sportscar might have quality tyres albeit runflats on the rear , non runflats on the front but very good ABS & TC :? i know which one id rather cover 300 miles in
