Run Flats over Non Run Flats

N

nobby_clarke

Member
Gents,

Im sure there has been a previous thread about this over the years but not getting much luck.

I need 2 new fronts and from previous exsperience what would you lads recommend running, either Run Flats or Non Run Flats.

I'm currently running Run Flats as that is what was fitted when I bought the car, being the M as you know the suspension is quite harsh and the road noise does appear to be quite loud so my thinking is that with Non Run Flats it would be a considerably lower Db. I read a thread a couple of months back that out of the factory no BMW M model is fitted with Run Flats, however no explanation was given to why this was.

Any advice would be great.

Cheers, Tom
 
nobby_clarke said:
however no explanation was given to why this was.
Click to expand...

Because they're shite.
No M car ever made runs on run-flats from the factory. Personally I would be changing yours asap.
Reasons being amongst those you've already mentioned.
Harsh ride
Increased noise
Basically as I understand it the side walls on a run flat are incredibly stiff relative to a normal tyre. This has an effect on NVH obviously and also the kinematics of the suspension system.
 
As above ms don't do run flats

Wrong tyres for a hard core machine
MSS won't regret it :)
 
Ok that's great thanks for that boys, was my thinking too that they shouldn't really be on the car.

I'm not running 224's, I'm running Finichi's (235-35-19's). Quite a low profile tyre.
 
To expand on what Mr Wilks said 224s are v unlikely to have the raised humps near the beads that are needed to support run flat tyress so you have the worst of both worlds - a tyre that is giving an unnecessarily harsh ride and a wheel that won't properly support a run flat tyre at the exact time you would need it most. Any tyre fitter with a modicum of sense would refuse to fit run flat tyres on a standard rim because there's a very real danger of the bead coming unseated when the tyre is run when flat. If you're running an aftermarket wheel make sure it has been designed for run flats - many are not.

M cars didn't come with runflats because the highest performance tyres from major manufacturers are not runflats - sort of a contradiction in terms really. Run flat tyres tend to be heavier and have extra stiff sidewalls.
 
nobby_clarke said:
Ok that's great thanks for that boys, was my thinking too that they shouldn't really be on the car.

I'm not running 224's, I'm running Finichi's (235-35-19's). Quite a low profile tyre.
Click to expand...

224's refers to the alloy wheel type (the standard Z4M wheel) not tyre size or anything like that.

Edit, sorry ignore that, think you got that!
 
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