Can you use run flats and non run flats on a car???

oo7tk

I need new tyres for my car and someone told me today i cant put run flats on the rear cause i dont have em on the front, is this true????

Captain Slow IRL

No, this should not cause a problem. Once you match tyres on the same axle, it should be okay.

Are run flats specified for your car?

oo7tk

Not 100% but its an E46 M3...

porsche boy

it can have an effect alright. Mainly on the rubber bushes in the suspension. Run flats are considerably stiffer on the sidewall and as such will not deform to the same level as standard tyres. This will lead to premature wear on the suspension components. Know a guy who ruined his front suspension on an A4 from using runflats.

Further more cars that are desgned to use run flats have a pressure warning system in place that alerts you of a puncture. This is necessary as you will not know from looking at the tyre if the pressure is at 30psi or 3psi.

My advice is to use standard tyres, run flats aint all that!

oo7tk

porsche boy wrote: »

it can have an effect alright. Mainly on the rubber bushes in the suspension. Run flats are considerably stiffer on the sidewall and as such will not deform to the same level as standard tyres. This will lead to premature wear on the suspension components. Know a guy who ruined his front suspension on an A4 from using runflats.

Further more cars that are desgned to use run flats have a pressure warning system in place that alerts you of a puncture. This is necessary as you will not know from looking at the tyre if the pressure is at 30psi or 3psi.

My advice is to use standard tyres, run flats aint all that!

I have a pressure tyre sensor in my car i knew i would need this.... Its just that the tyre size im lookin for is 275,35/19 and new decent tyres are too expensive and im selling it also... Gettin part worn Potenzas with 8mm on them for 150 so its a great deal.....

unkel

porsche boy wrote: »

it can have an effect alright. Mainly on the rubber bushes in the suspension. Run flats are considerably stiffer on the sidewall and as such will not deform to the same level as standard tyres. This will lead to premature wear on the suspension components. Know a guy who ruined his front suspension on an A4 from using runflats.

Further more cars that are desgned to use run flats have a pressure warning system in place that alerts you of a puncture. This is necessary as you will not know from looking at the tyre if the pressure is at 30psi or 3psi.

My advice is to use standard tyres, run flats aint all that!

Welcome to boards. Nice first post

porsche boy

unkel wrote: »

Welcome to boards. Nice first post

cheers, long time lurker....

Matt Simis

oo7tk wrote: »

Not 100% but its an E46 M3...

Why would you put on RFs on a car not designed for them, put them on in pairs not quads and do all of this stupidity on an M3 of all things?
Just put proper tyres on it.

RFs will destroy the ride and handling and with RF on one axis give weird and unpredicable handing (rear suspension is meant to be softer, this will make it harder leading to more oversteer).


AFAIK, no M car was ever supplied with RunFlats as standard.

dharn

many people with runflats contemplate changing to standard so it does not seem like a good idea to go the other way

rebel.ranter

oo7tk wrote: »

I have a pressure tyre sensor in my car i knew i would need this.... Its just that the tyre size im lookin for is 275,35/19 and new decent tyres are too expensive and im selling it also... Gettin part worn Potenzas with 8mm on them for 150 so its a great deal.....

Are you buying those Runflat Potenzas on Adverts.ie? If so they only have 5.5mm on them. Normally people go the other way, from Runflats to non-Runflats.

Nissan doctor

Its also unsafe to fit runflat tyres to wheels not designed for them. Alloys designed for runflat tyres have reinforced outer rims to support the tyre when there is no pressure.

Its well known that most people feel that runflats fitted to the standard e46's ruin the handling so why you'd want them on an M3 is beyond me.


IMO, Buy tyres to suit the car or buy a car to suit your pockets...one or the other.

Even if you are selling it, its a specialist car and if someone comes to look at it and see's wrong/cheap or whatever tyres on it, its gives a very bad impression of how the rest of the car has been maintained.

Gumbo

oo7tk wrote: »

Not 100% but its an E46 M3...

Am i right in saying you cannot put Runflats on a wheel that wasnt designed to take the run flat in the first place? something to do with the make up of the wheel :

\ | | /

where the 2 inner lips are there to help the RFT side wall stay upright.

the E46 M3 didnt come with RFT IIRC.

oo7tk

No there not the tyres am gettin ones with much more thread..... And i did not buy my car for its intended reason to thrash it around a track i bought it cause i like M3's and like to have the power to overtake a car so the handeling is not a major factor on my 2 mile town commute to work...... I would doubt many M3's are used fr what they were made for really and to be honest i would not buy one that had..... Seein as im sellin it i may just buy the proper tyre really as i wont sell it if its not right...

Nissan doctor wrote: »

Its also unsafe to fit runflat tyres to wheels not designed for them. Alloys designed for runflat tyres have reinforced outer rims to support the tyre when there is no pressure.

Its well known that most people feel that runflats fitted to the standard e46's ruin the handling so why you'd want them on an M3 is beyond me.


IMO, Buy tyres to suit the car or buy a car to suit your pockets...one or the other.

Even if you are selling it, its a specialist car and if someone comes to look at it and see's wrong/cheap or whatever tyres on it, its gives a very bad impression of how the rest of the car has been maintained.