Which Runflats
- Thread starter Fireball
- Start date
I know it has been a while since the original post, here is what happened.
First tyres changed were the rears as they were well down on the wear bars, in the end due to apparent lack of availability of the Goodyear’s Asy I went for Michelin PS run flats. The transformation in grip and noise was nothing short of staggering compared the removed Bridgestones, ride quality from the rear tyres was also much improved with the crashiness over rough tarmac, potholes and manhole covers also much improved.
Once they were scrubbed a problem reared it’s head, the front end kept washing out on bends and roundabouts. I guess in terms of steering it was massive understeer, in reality the fronts just couldn’t hang in there with the amount of grip the rears were providing. It was enough to cause the traction control to kick in at times which was a bit puzzling, at the time the front tyres had 3 - 4mm of tread left on them.
Result was a change to matching Michelin’s at the front - the car is now totally transformed, quieter, much more compliant over rough surface, potholes etc and no tramlining, no washing out and traction control behaves itself.
In reality it feels no less compliant than my grocery getter which has 19” wheels and non runflats. ( Z has 18” assymetric wheels )
I guess in conclusion it just shows how far behind the game Bridgestone runflats are these days, I certainly plan to keep running runflats for as long as I have the Z as a result of this experience. Non runflats maybe even better but this will do me for now.
First tyres changed were the rears as they were well down on the wear bars, in the end due to apparent lack of availability of the Goodyear’s Asy I went for Michelin PS run flats. The transformation in grip and noise was nothing short of staggering compared the removed Bridgestones, ride quality from the rear tyres was also much improved with the crashiness over rough tarmac, potholes and manhole covers also much improved.
Once they were scrubbed a problem reared it’s head, the front end kept washing out on bends and roundabouts. I guess in terms of steering it was massive understeer, in reality the fronts just couldn’t hang in there with the amount of grip the rears were providing. It was enough to cause the traction control to kick in at times which was a bit puzzling, at the time the front tyres had 3 - 4mm of tread left on them.
Result was a change to matching Michelin’s at the front - the car is now totally transformed, quieter, much more compliant over rough surface, potholes etc and no tramlining, no washing out and traction control behaves itself.
In reality it feels no less compliant than my grocery getter which has 19” wheels and non runflats. ( Z has 18” assymetric wheels )
I guess in conclusion it just shows how far behind the game Bridgestone runflats are these days, I certainly plan to keep running runflats for as long as I have the Z as a result of this experience. Non runflats maybe even better but this will do me for now.
Don't forget that you're not only switching brands, you are also changing from old, worn tyres to new ones. That in itself will likely make a big difference.
I'm surprised your runflat michelins are quiet, because my non-runflat PS4S's are noisy as hell. In every other respect they are brilliant, but quiet they are not.
I'm surprised your runflat michelins are quiet, because my non-runflat PS4S's are noisy as hell. In every other respect they are brilliant, but quiet they are not.
Scotland 🏴
Zed Baron said:
No, they’re not, normal Michelin pilot SuperSports iirc
Zed Baron said:Thanks Andy, thats interesting that BMW have steered away from them this time. I read that the M40i hadn't got them but wasn't sure about the rest of the range.Argyll Andy said:Zed Baron said:
No, they’re not, normal Michelin pilot SuperSports iirc
Rick, they all came with non run flats, a compressor and gunk kit. Sars asked about the tyres in another post and was surprised that they were Pilot SuperSports when they’d been superseded by MPS4S’s. When I need to replace I’m not sure which ones I will replace with. Pros and cons, PSP’s grip like mad in the dry, not so grippy in the wet/cold wear quite quickly
PS4S’s not quite so grippy/sticky in the dry (but still good) but slightly better in the wet/cold and didn’t have them on long enough to assess wear as I sold the car not long after. All IMO of course Attachments
Just fitted Pirelli P Zeros 18" to the front end, it has transformed the handling 500%.
No tramlining and the handling is spot on, so happy I have kept the Run Flats and found a tyre that works, recommended Guys
No tramlining and the handling is spot on, so happy I have kept the Run Flats and found a tyre that works, recommended Guys
North West Surrey
I went through 2 sets of 17" Pirelli P Zero run-flats on my 123d, but ended up with Pirelli P7s for the last set.
Still I was very happy with both options, although the P Zeros tended to wear on the outer edges and once they were down to about 3mm they did tramline a bit. I didn't keep it long enough to see if the P7s did the same!
Still I was very happy with both options, although the P Zeros tended to wear on the outer edges and once they were down to about 3mm they did tramline a bit. I didn't keep it long enough to see if the P7s did the same!
Hi, will the Pirelli Zero's work on 437's? I still like the idea of keeping runflats if a set of good ones like these PZ's can be put on. I am slightly ill-at-ease with none run flat if I am honest. I want to replace my 326's with 437's and if those PZ's work then this sounds a great combination.
^^^^Hi chaps, any thoughts on that?
What is it about 437s that make you think they would not work buddy? most wheels will take runflats afaik, being a forged wheel they are stronger than cast so shouldn't really be an issue imhostep_change said:
Scottish Borders
Ah, no idea on that Ron, you may well be right, kinda working on the assumption that most bmw wheels seem to take either type of tyre and mostbmw production cars are actually fitted with runflats.. maybe step change would be better off consulting his local tyre fitterronk said:
Yes that's my thought too. Hence me asking chaps. I wondered if @Mr Wilks might know.ronk said:
It may indeed be best to see a tyre fitting guy and ask them about a run flat for a 9J/10J that does not rub.
step_change said:
According to Pete 437m did have runflats as standard on certain markets which you would expect with a bmw oe wheel.. still worth checking with local fitters thoughB21 said:
mr.tourette said:
I agree, definitely worth checking but as Peter says they came with that option standard should be
I do know the G29’s state/have a disclaimer somewhere in their blurb saying the wheels must not be fitted with run flats
ronk said:
Incorrect, almost all modern alloy wheels can use runflats..the technology for run flats rests in the tyre not the rim..
I think when dunlop first made runflats with bottles of lubricating gloop then that would have been the case..
https://www.bridgestonetire.com/learn/tire-technology/run-flat-tires/#