[old grey steve]

As per title.






check your tyres reguarly. Turn the wheel lock to lock check the insides on the rears put your hand right in side and feel with your hands the inner circumfrence of your rears. Check your pressures ideally once a week 10 days the above are runflat Bridgestone 225/35/R19 RE050's and there's enough info on these and other RFT's to write a book. The above pictures to me are a result of under inflation more than anything causing advserse wear heat and delamination. Just because the RFT monitor says all is well is it?

What's more worrying is that we are seeing this more and more to such an extent now that it doesn't really surprise me now. If you're unsure check them if you don't know how to chek them get someone to do it for you, if you feel the cars not handling right get it cheked out as you might be in for a surprise.

[dj219957]

ditched my runs flats and have never looked back.

[E90325iM-SPORT]

Originally Posted by dj219957

ditched my runs flats and have never looked back.

same here

[essex_lad]

Originally Posted by dj219957

ditched my runs flats and have never looked back.

I want to loose mine, what tyres are you using?

[djgandy]

Steve, there is another thread on here (http://www.e90post.com/forums/showthread.php?t=989950) about the inner sidewall ripping away from the tyre. This is only visible with the tyre off though and has happened with perfectly healthy looking tyres. These tyres are just absolute rubbish. The manufacturer keeps the stance that any tyre that is in a state has been run flat.

[old grey steve]

RFT's seem to suffer this trait more than non RFT's (hence mine went 2 weeks after I bought my car)part of the issue though centres on BMW's set up of the suspension (notice how most if not all BMW's including X5's and Z4's scrub inner edges so alarmingly)and how many owners have been caught by the dreaded alloy wheel cracking syndrome, which are all connected by many to the use of RFT's possably wheel strength issues(changed from MV4's to 313's which still crack)

But still say the move from RFT's to non RFT's aids many of the issues, our roads perhaps v the standard BMW suspension set up do also have a bit to answer too as well. But the final piece of the jigsaw lies with tge owner regular tyre pressure checks can/will draw attention to issues and can prolong tyre life/safety

[Sparky68]

1st thing i did when I bought mine before any other modification.

[acerboo]

mine went like that and bridgestone gave me the same bullshit that it was my fault for running them underinflated when I check the tyre every week and keep the pressure spot on. no what caused it was the tyres are rubbish and bridgestone should have been responsible and withdrawn these dreadful tyres and replace them with ones suitable for the job. since binning the bridgestones and I would never touch them with a bargepole I have run rft Pirellis and non rft goodyears and not had the same problem.

[old grey steve]

Originally Posted by acerboo

mine went like that and bridgestone gave me the same bullshit that it was my fault for running them underinflated when I check the tyre every week and keep the pressure spot on. no what caused it was the tyres are rubbish and bridgestone should have been responsible and withdrawn these dreadful tyres and replace them with ones suitable for the job. since binning the bridgestones and I would never touch them with a bargepole I have run rft Pirellis and non rft goodyears and not had the same problem.

This tyre thing is worrying the car above(and I forgot to say in my OP by the way)was under inflated customer just thought that because the RFT monitor hadn't flagged everything was OK clearly it wasn't as the info on that system is as good as that it's fed(and its sensitivity can be called in to question at times)I don't however feel that in this case underinvesting was the whole answer.

I see a fair few BMW's with the same/similar wear characterises as I stated elsewhere Bridgestone tyres I would agree on the 18's and 19's seem to suffer there are other RFT manufacturers but I remember a fair while ago a lot of issues re wear, BMW as a supplying car manufacturer and Bridgestone as a tyre supplier to the car manufacturer where we had cracked alloys and God knows what else. Why is it that when we see cars they all scrub on the inner edges so badly especially on the rear? I've seen BMW's with GoodYear RFT's mainly 5's with less wear than say you'd see on a Bridgestone shod example.

When you remove RFT's you gain ride comfort, improved traction/grip, reduced cabin noise, less risk of wheel damage and greater tyre longevity and everyone kinda reports the same post change results.

Is it more of an issue in the UK than in Europe that we have these issues?

For me I suspect moving forward you can take control of your tyres by swapping out you can look to alter the suspension settings to reduce tyre wear especially on the rears and if you as the owner can carryout all this on a 3 series to an X5 then you have to ask yourself did BMW not cater to the longterm needs of the customer/country of supply(by reviewing tyre type suspension setting)if so many owners were encountering the same wear issues and the same issues when called to account.

Honestly I of bourse don't know the answer but the BMW/Bridgestone RFT combo isn't it would seem the smartest one for your wallet wheels and if one of these tyres went bang perhaps your health.

[Jeff123]

The only good thing about the whole runflat issue is the fact that BMW/Mini have tyre pressure sensors. These are quite handy - as long as you know how to set them, which I suspect many people don't.

[Jeff123]

Originally Posted by essex_lad

I want to loose mine, what tyres are you using?

Virtually any mid-range non-runflat. IMO, you don't need to be too selective, just avoid the really cheap brands.

[dj219957]

hankook v12 ventus.

[HighlandPete]

Originally Posted by old grey steve

...What's more worrying is that we are seeing this more and more to such an extent now that it doesn't really surprise me now. If you're unsure check them if you don't know how to chek them get someone to do it for you, if you feel the cars not handling right get it cheked out as you might be in for a surprise.

Doesn't surprise me either, as we know lack of tyre care is a problem right across the board, not just BMW users. RFTs need extra attention, we know they are even more sensitive to working pressures and alignment issues. That is the nature of the beast, whether we like it or not.

Good to see a reminder to check tyres posted on the forums. So easily neglected, or just a quick look at the tread.

The second picture clearly shows the wear pattern associated with low pressure, aggressive alignment just makes this worse. I've posted pretty much my views in the thread linked in one of the posts, saying more is just repeating what many of us learned several years back.

Just one observation, many say their pressures are "spot on" and alignment is fine. What exactly is the definition of spot on when pressures are set to load, speed, wear balance, etc.? Also what is a "spot on" alignment setting? Simply being 'in tolerance' is not necessarily the optimum calibration for best tyre wear.

HighlandPete

[BirdsEye]

I must admit I was little guilty of this lately. Checked my pressures the other day and noticed the rears were a little low so like others was surprised the RFT monitor didn't pick anything up. Gutted though as I just bought 4 new run-flat tyres and would be so happy to ditch them for Michelin PSS.

[AWSAWS]

Originally Posted by dj219957

hankook v12 ventus.

I'm on s1 evo 2 and love them! Proved pretty good on snow which I wasn't expecting.

[djgandy]

Originally Posted by BirdsEye

I must admit I was little guilty of this lately. Checked my pressures the other day and noticed the rears were a little low so like others was surprised the RFT monitor didn't pick anything up. Gutted though as I just bought 4 new run-flat tyres and would be so happy to ditch them for Michelin PSS.

Unless you have the actual pressure monitors, the RFT monitor requires something like a 30% differentiation in pressure. to trigger enough rotational difference for the car to think there is a flat.

[HighlandPete]

Originally Posted by djgandy

Unless you have the actual pressure monitors, the RFT monitor requires something like a 30% differentiation in pressure. to trigger enough rotational difference for the car to think there is a flat.

This is the problem with the indirect wheel speed sensor based system, it is only a warning system (TPWS), for when there is a major deflation issue.

Running at diminishing pressures down to ~30% below the ideal, over time, can ruin a run-flat tyre BEFORE the warning ever triggers.

Many users are not aware they need even more attention to tyre pressures when we have RFTs and TPWS, as we can't "see" a low tyre pressure and the RFT requires to be at optimum pressures, not to run on the sidewalls. Plus many users don't reset the TPWS at each tyre pressure adjustment, so making the system no real use at all, or they get false triggers.

The direct wheel sensor based TPMS is the better system, particularly where the actual running pressures are available to see on a display.

HighlandPete

[Jeff123]

Originally Posted by dj219957

hankook v12 ventus.

Had 3 sets of Hankook; very good with a good price.

[zltm089]

Check tyre pressures regularly... run flat or not....

and don't rely on that stupid tyre pressure monitor...

[90MSP]

Wow, those pics look fairly similar to the state of my run flats when I decided to check them out last year, but mine weren't as bad. Got shot of them all pretty quick and mighty glad I did.
Good advice Steve, I was totally caught by surprise with mine, I shouldn't have been, but neither should the tyres have been like that either.

[old grey steve]

Seems that the insides are more prone of course than anything re wear




the rears aren't ussually visible therefore people don't look (like the fronts for many too)when this Z4 owner complained of a vibration from the rear they were asked about the tyres always check them came the answer. So simple crouch from the rear looking over the tread revealed this



well I'll let you work it out how good the checks were. Check for pressures check the front inside and out by turning the wheel lock to lock and checking the whole width of the tyre and on the rears run your hands around the inside of the trad. Simple advice but it'll focus your mind if you discover any wear or feel chords