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Run flat tyres?.

2K views 11 replies 10 participants last post by  DTB 
#1 · (Edited)
Are they a legal requirement on BMW?
I noticed today I have Bridgestone Turanza RFT 275/35/19 on the rear.
Goodyear Eagle Asymmetrical 3, 245/40 /19 run flats on the front.
These are both around 50% worn, so looking at replacing the 4 together didn’t know if I needed to have Run flats to replace? Either way all 4 will be replaced with matching tyres I hate mismatched tyres.

Is it normal to have different profiles for front and rear? I know width is different but tyre wall aswell?
 
#2 ·
I would ask your insurance company, but usually if they are the correct sizes and speed rating they won't have an issue.

It used to make a massive difference in ride quality changing from runflats to normal tyres. I've read a few people say that modern BMWs feel a bit too soft when changing.
 
#5 · (Edited)
I would ask your insurance company, but usually if they are the correct sizes and speed rating they won't have an issue.

It used to make a massive difference in ride quality changing from runflats to normal tyres. I've read a few people say that modern BMWs feel a bit too soft when changing.
It's certainly a hard ride, hit even a cats eye and you feel it. Guess that comes down also to the 35/40 profiles. To be honest I don't mind them, just that the selection is quite limited.

In fact so limited, I can only find Goodyear Eagle F1 Asymmetrical 3 run flats , in both 245/40/19 + 275/35/19.
 
#8 ·
Are they a legal requirement on BMW?
I noticed today I have Bridgestone Turanza RFT 275/35/19 on the rear.
Goodyear Eagle Asymmetrical 3, 245/40 /19 run flats on the front.
These are both around 50% worn, so looking at replacing the 4 together didn't know if I needed to have Run flats to replace? Either way all 4 will be replaced with matching tyres I hate mismatched tyres.

Is it normal to have different profiles for front and rear? I know width is different but tyre wall aswell?
Yes to have different profiles front and rear when it's a staggered set up as the profile is a % of the width (so potentially they're the same height tyre, just different profile as rear are wider).

I read a lot and discussed with our local service manager when I needed to replace my tyres, should you keep to run flats etc, I decided against change and kept to run flats - new run flats are a world away from the older versions, the car is set up for run flats / stiffer side walls and you need to inform your insurance company as you've modified the car from standard figment. I got a good price on a set and don't regret not changing to 'normal' tyres.

But as with you, I'm not keen on different makes of tyre on the car..
 
#9 ·
The Bridgestone runflats that came on my 2015 car sounded like I was in a jet plane on certain surfaces. They were very noisy.

BMW will of course recommend you fit runflats. A well qualified tyre fitter will be able to tell if the rims can take any other tyre.

I switched to Michelin cross climates and have been very happy.

My insurance company had no problem with the switch.
 
#11 ·
Interesting this.

I looked at a website to buy a set of different wheels for my 5 series.
The ones I looked at recommended not fitting RFT's but to contact your insurance.

Have a look at Falken RFT's, I fitted 4 of these to my last 5 series and they were better I would say.
 
#12 ·
No, for your first question. Definitely not required to continue using run-flats.

Yes, for your second question. Different profiles not uncommon on BMW.

They don't put run-flats on M cars (I don't mean M-sport), which come with a repair kit instead. I really don't like the run-flats at all and will be swapping mine shortly. The difference it made to my wife's 3 series was significantly for the better.

http://bmwspecialistreading.co.uk/why-we-dont-recommend-runflat-tyres/
 
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