I have just purchased a 2005 2.2 and have noticed that i have a non runflat on the rear off side, the tyre looks new so am reluctant to replace it to complete the set of 4 run flats,my question is, apart from the obvious problem that would arise from a puncture should i change it for a runflat, i understand its inadvisable to run different tyre types on the same axil. The other 3 a Bridgestone Potenza 225s and a rear 255.
mixing run flats and non run flat?
- Thread starter Hitch
- Start date
my previous zed had the same problem on the front axle - one RF and one NRF - fortunately they were both on the limit so I replaced them with RF's to match the rear - chap at tyre place said to have different ones on one axle is definitely not advisable as it would upset the balance etc - not the news you want to hear but better to be safe and change the one to a RF or the other 3 to NRF's - either way there's always someone on here that would buy your old tyres if they have plenty of tread.
Hope this helps
Hope this helps
Can't Imagine that's right. So Joe public has a worn ditch finder on one corner and Michelins on the other 3 and they wouldn't pay out for that too? Not exactly the same but I would imagine that as long as tyres are legal then you are OK.
EDIT
"While one of the biggest insurers, Aviva, say that changing from run-flat to conventional tyres would make no difference to the insurance policy, as long as the tyres were road legal and the insurance company was informed, terms may differ from company to company. Therefore customers should seek advice from their insurer before making any changes"
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EDIT
"While one of the biggest insurers, Aviva, say that changing from run-flat to conventional tyres would make no difference to the insurance policy, as long as the tyres were road legal and the insurance company was informed, terms may differ from company to company. Therefore customers should seek advice from their insurer before making any changes"
Posted from Tapatalk
The actual "rules."
1) Non run flats fit on runflat rims. The other way around doesn't work.
2) If the load and speed rating are correct, the tyres are fine.
3) RFTs are the biggest con to come out of the car industry in years. They ruin the ride, they don't give progressive handling, they are rubbish. 3rd gen are still rubbish.
4) BMWs are not "tuned" for RFTs - they just got bribe money from the manufacturers to fit them (this isn't true but I do wonder why on Earth BMW decided it was a good idea to ruin most of their modern cars with them).
5) Non runflats have been standard on Alpinas and M cars forever.
6) Most models now offer RFTs as a no cost extra. Has BMW finally learned it's lesson?
They tramline, they crash over bumps, they make the limit if grip almost impossible to judge. And they weigh too much. Other than that they're great ;-)
I had precisely this concern a few months ago when I swapped the run-flats on my car for non run-flat tyres: called my insurers, who confirmed there was no problem.
1) Non run flats fit on runflat rims. The other way around doesn't work.
2) If the load and speed rating are correct, the tyres are fine.
3) RFTs are the biggest con to come out of the car industry in years. They ruin the ride, they don't give progressive handling, they are rubbish. 3rd gen are still rubbish.
4) BMWs are not "tuned" for RFTs - they just got bribe money from the manufacturers to fit them (this isn't true but I do wonder why on Earth BMW decided it was a good idea to ruin most of their modern cars with them).
5) Non runflats have been standard on Alpinas and M cars forever.
6) Most models now offer RFTs as a no cost extra. Has BMW finally learned it's lesson?
They tramline, they crash over bumps, they make the limit if grip almost impossible to judge. And they weigh too much. Other than that they're great ;-)
I had precisely this concern a few months ago when I swapped the run-flats on my car for non run-flat tyres: called my insurers, who confirmed there was no problem.
Rft`s & Non-Rft`s can be used on your car,as long as NOT on the same axiel,as the problem Hitch has. change one of them so the pair match. As for running rft`s & Non-rft`s on front & rear is fine. I ran rft`s on the front of my 335d & non-rft`s on the rear for a year with no problems what so ever.
KERMIT1970 said:
Me too on my E85, but the new owner switched to non RFT all round and said the ride etc was much better
Well, I suppose they're both round & made of rubber.
It's already been stated that RFT's are heavier, offer different handling characteristics, so on a finely tuned sports car which is well known for it's steering features am amazed some would contemplate mixing on the same axle, let alone mixing them on the car.
I doubt any of you on here really drive like Miss Daisy, so in an exuberant situation which goes OTT is surprising you'd be risking it when you're relying on just 4 small bits of rubber between you & your maker.
It's already been stated that RFT's are heavier, offer different handling characteristics, so on a finely tuned sports car which is well known for it's steering features am amazed some would contemplate mixing on the same axle, let alone mixing them on the car.
I doubt any of you on here really drive like Miss Daisy, so in an exuberant situation which goes OTT is surprising you'd be risking it when you're relying on just 4 small bits of rubber between you & your maker.
A
Anonymous
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To mix RFT and NON RFT across an axle is really not good at all.
If I were you, I would get it sorted ASAP. It is simply not worth it as the consequences could be serious.
I had an E92 335i before the Z4 and I took it off runflats one axle at a time. I did the rear axle first and the difference between the behaviour of front and rear axle due to the tyres made the car far less stable.
The Z4 is a far more twitchy than my E92 so to have a RFT and non RFT across the same axle . . . .
If I were you, I would get it sorted ASAP. It is simply not worth it as the consequences could be serious.
I had an E92 335i before the Z4 and I took it off runflats one axle at a time. I did the rear axle first and the difference between the behaviour of front and rear axle due to the tyres made the car far less stable.
The Z4 is a far more twitchy than my E92 so to have a RFT and non RFT across the same axle . . . .