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Old 5th February 2017, 11:23 AM   #21
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There is a school of thought that if a new car is supplied with RFs by the maker, the suspension is designed to take the stiffer sidewalls into account, and changing tyre type could affect handling. How true that is, and whether there are ways to compensate I do not know.

Interestingly are BMW not moving away from them anyway, with cars such as the M1xxi series coming with the old compressor and goo once more?

All I know from personal experience is that when I've had courtesies with RFs they have felt too firm and somewhat isolated from the road.
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Old 5th February 2017, 06:56 PM   #22
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A mate of mine bought a new 3 series in September and he had the option of changing the wheels and RF's to MPSS's, no suspension change.
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Old 5th February 2017, 07:06 PM   #23
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Speaking from experience or an internet forum expert?
Reality
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Old 29th May 2017, 11:16 AM   #24
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I thought I would update the thread with my experience of changing to non runflats on my e93 335i.

Before I go any further I have to say I have generally never disliked run flats; in fact I liked the safety aspect and generally had no issues with the ride and comfort they provided on a previous e90 saloon (18s), f10 520d (19s) and also f30 320d (19s).

However On the e93 335i (19s) it really bothered me, I found is so harsh that at times I could not tolerate it. I think on the e93 its made as worse it can be due to the fact its heavier and also runs a high PSI (42 on front, 48 rear).

I had OE tyres all with around 8mm tread on them when I bought the car. 1 tyre ended up being damaged on a pothole, 2 had a slow puncture and I used this as an excuse to change the tyres all round.

I ended up going for the Goodyear Eagle F1 As3 tyres.
On the drive home from the tyre place I use which is a good 35 miles away it felt nicer but I wasn't sure if it felt significantly better than the run flats.

I have now had the tyres on for over 3 weeks going over the same roads I use day in and day out and honestly wish I didnt bother to tolerate the runflats for the first 5 months I had the car.

looking at the wear pattern with chalk lines across the width of the tyre. 39 front and 42 rear is ideal for these tyres.

Comfort is night and day compared to before. on the run flats there used to be roads I used to point blank avoid as it almost made me hate the car and now they really dont bother me at all on these new tyres.

You can tell straight away on over small humps, imperfections theres a level of absorption in the tyre that you just never at all got with the run flats: feels more cushioned.

Lastly when pushing hard these particular non run flats are more predictable, on the bridgestones I struggled to tell if I was near the limit of the tyre or not, it felt like I was riding on plastic tyres: horrible. On the GY's the feedback the tyres give is excellent, it gradually lets you know you are getting to or are at the limit of the grip.

Overall very very pleased I made the change, I just wish I done it sooner.
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Old 29th May 2017, 11:32 PM   #25
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looking at the wear pattern with chalk lines across the width of the tyre. 39 front and 42 rear is ideal for these tyres.
How does this work?
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Old 30th May 2017, 03:40 PM   #26
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I have a question related to this:

I have Michelin RFT's all round on my 650i and the rears need replacing. I'm likely going to buy Super Sports or 4S's. Will I need to change the whole lot or will the rears only suffice?
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Old 30th May 2017, 07:27 PM   #27
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I have a question related to this:

I have Michelin RFT's all round on my 650i and the rears need replacing. I'm likely going to buy Super Sports or 4S's. Will I need to change the whole lot or will the rears only suffice?
Full set really I'm afraid........fitting two will compromise the grip & handling. Definitely a choice you won't regret though
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Old 31st May 2017, 08:06 AM   #28
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I have a question related to this:

I have Michelin RFT's all round on my 650i and the rears need replacing. I'm likely going to buy Super Sports or 4S's. Will I need to change the whole lot or will the rears only suffice?
My buddy at work has an M135i with [go flat] Super Sports all round. Then he bought a set of used winter run flats because I told him he needed to get some winter boots. He started using these and within a few days had decided they were useless. They were 225 40 all round. I told him that run flats are just useless full stop. He didnt believe me and thought it was because these were thinner than the 245 tyres he had on the rear before. So to prove my point I told him to fit a pair of decent conti go flat winters from one of my cars in the same size to his wheels and try driving his car then. He put them on the back to see if they could handle the power. Immediately he realised they were great and enjoyed driving the car again round the estate near the tyre bay. Then on his way home he hit some dual carriageway and speed rose to 60 - 70 etc. He said the car became unstable over 60. He couldn't quite explain it but assumed it was some form of imbalance between the run flats and go flats. He immediately bought some new go flat contis all round and then he was happy.
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Old 31st May 2017, 09:37 AM   #29
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Cheers. I suspected as much.

The fronts still have a load of tread, so I'm hoping I can flog them on eBay and recoup some of the costs. 850 or so is a big hit!
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Old 31st May 2017, 10:11 AM   #30
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Cheers. I suspected as much.

The fronts still have a load of tread, so I'm hoping I can flog them on eBay and recoup some of the costs. 850 or so is a big hit!
Tyres sell for F all on eBay.
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Old 31st May 2017, 01:37 PM   #31
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Brilliant

Oh well. I knew it wouldn't be cheap when I bought it so not going to get too upset over it. Will have to sell them anyway as I'll never use them again.

Anyone want some crashy run flats?
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Old 4th August 2017, 12:00 PM   #32
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I changed to Uniroyal Rainsport 3 on the E93 335i, so much better than the RFT's

It feels like I have suspension fitted now

The initial turn in gives slight understeer, then grips really well.
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Old 4th August 2017, 04:34 PM   #33
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I have gone through many sets of Rainsports (1s and 2s, but not 3s yet), and I highly rate them - a very good all round tyre. In fact I don't yet have the same level of confidence with the Pilot Supersports I recently purchased to replace the last set of rainsports.
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Old 4th August 2017, 04:38 PM   #34
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Quote:
Originally Posted by SkyInsurance View Post
Cheers. I suspected as much.

The fronts still have a load of tread, so I'm hoping I can flog them on eBay and recoup some of the costs. 850 or so is a big hit!
If you have plenty of tread left on the front, I can't see how just changing the rears would be detrimental to the cars handling/grip?!!

Rear tyres on high powered rear wheel drive cars will always wear quicker than the front. Just replace the rears they'll catch up with the fronts in no time
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Old 4th August 2017, 05:08 PM   #35
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I can't see how just changing the rears would be detrimental to the cars handling/grip?!!

Mixing different brands isn't a good idea, different handling characteristics.
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Old 4th August 2017, 05:20 PM   #36
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Mixing different brands isn't a good idea, different handling characteristics.
Ah ok was assuming replacing the same type of Tyres
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Old 4th August 2017, 05:25 PM   #37
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Ah ok was assuming replacing the same type of Tyres
Runflats are a different type of construction and are far heavier therefore changing the unsprung weight and handling characteristics
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Old 4th August 2017, 05:33 PM   #38
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Runflats are a different type of construction and are far heavier therefore changing the unsprung weight and handling characteristics
Of course, misread or failed to read the sky insurance's post properly lol
Complete agreement - all 4 needs to be changed
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Old 12th August 2017, 08:26 AM   #39
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Quote:
Originally Posted by cjchapman1 View Post
Hi All,

Looking for a bit of advice and experiences with tyres.

I have an E92 335i M-sport with the 19inch wheels.

The time has come where i now need to replace all 4 tyres. I am trying to decide between replacing all 4 with Bridgestone run flats again (which dont give the best ride) or replace them with 4 uniroyal rainsport3s (other suggestions welcome). I dont want to spend a fortune as I need to get rid of the car within the next 3 - 6 months.

Any advice / experience would be much appreciated.

Thanks,

Craig
Long story short- my Potenza run flats cost me 3 sets of new alloys due to our great roads. Avoid them - Just get the usual tyres (I have Conti's)

Avoid runflats!
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