Mixing runflats and standard tyres
Discussion
The Stiglet said:
Can't see that working. Surely different tyre pressures, profile depths, contact patches and different ride/handling characteristics makes for some unsettled and perhaps dangerous driving?
All or nothing IMHO.
Would that be a problem!! Sometimes tyres have different pressures front and rear. Tread pattern will change anyway if you put different makes of tyre on the front compared to the back. Could do with not paying for 4 tyres,All or nothing IMHO.
I did it for a short time, whilst waiting for the next nail to turn up in the run flats.
It's not dangerous, but not ideal either. The proper tyres will have a massively grip level than the run flats. I ended up in a four wheel drift around a greasy roundabout at very low speed. Straight after that I dumped the other 2 runflats.
It's not dangerous, but not ideal either. The proper tyres will have a massively grip level than the run flats. I ended up in a four wheel drift around a greasy roundabout at very low speed. Straight after that I dumped the other 2 runflats.
had the same question a few months ago. after much discussions with my bmw mechanic i put non run flats on the front, as only these needed changing. 21" bmw wheels on a new x5 sd, 285 35's.
so much better and less crashy and no problems at all. but obviously its not a car thats thrown around.
i changed all 4 on my cooper s to non run flats and again so much better.
so much better and less crashy and no problems at all. but obviously its not a car thats thrown around.
i changed all 4 on my cooper s to non run flats and again so much better.
newberry said:
Mine has run flats on the back and normal on the front and seems ok, and I'm not dead yet either.
If you have tpms fitted then its not so bad. If you don't, you're running a big risk.Either way, the mix of tyres will shift the balance and feel of the car quite a bit which is far from ideal.
The way I see it:
Big expensive car, priceless occupants and other road users about.
The Tyres are the only things that stick the car to the road, why take a risk? Get new ones all around and then flog the part worn ones on eBay.
From my experience with the Z4, ditching the runflats was the best decision I made.
Big expensive car, priceless occupants and other road users about.
The Tyres are the only things that stick the car to the road, why take a risk? Get new ones all around and then flog the part worn ones on eBay.
From my experience with the Z4, ditching the runflats was the best decision I made.
BJT said:
The way I see it:
Big expensive car, priceless occupants and other road users about.
The Tyres are the only things that stick the car to the road, why take a risk? Get new ones all around and then flog the part worn ones on eBay.
From my experience with the Z4, ditching the runflats was the best decision I made.
Does anyone actually buy part-worn tyres on ebay? If so, I'd consider changing all 4 of mine, but if not I begrudge doing that now seeing as I've only done about 2000 miles on the current (RFT) rears.Big expensive car, priceless occupants and other road users about.
The Tyres are the only things that stick the car to the road, why take a risk? Get new ones all around and then flog the part worn ones on eBay.
From my experience with the Z4, ditching the runflats was the best decision I made.
Also, has anyone had to deal with the BMW Insured Warranty people having changed RFT's for non-RFT's? Last time I asked, I was advised that doing so may well void the warranty that I'd just shelled out to renew...
Raify said:
I ended up in a four wheel drift around a greasy roundabout at very low speed. Straight after that I dumped the other 2 runflats.
So you went into a four wheel drift, but you're blaming the two runflats for it?If you went into a four wheel drift, looks like all four tyres lost grip at the same time.
Therefore, no difference in grip between your runflats and non-runflats.
My opinion on the subject is that the average driver won't notice any difference.
So if they can't afford it, don't do it.
Edited by Magnus Barelegs on Monday 9th May 11:08
Magnus Barelegs said:
So you went into a four wheel drift, but you're blaming the two runflats for it?
If you went into a four wheel drift, looks like all four tyres lost grip at the same time.
Therefore, no difference in grip between your runflats and non-runflats.
My opinion on the subject is that the average driver won't notice any difference.
So if they can't afford it, don't do it.
Yes, because under normal circumstances, the FWD car they were attached too would have understeered first. Even though both sets of tyres had comparabable tread depths, the rears let go as if they were near the markers (exacltly like it did on 4 normal tyres with wear markers showing on the rears). If you went into a four wheel drift, looks like all four tyres lost grip at the same time.
Therefore, no difference in grip between your runflats and non-runflats.
My opinion on the subject is that the average driver won't notice any difference.
So if they can't afford it, don't do it.
Edited by Magnus Barelegs on Monday 9th May 11:08
Therefore, the runflats had different levels of grip.
anonymous said:
[redacted]
Again, that isn't a problem at all.I've had cars where every tyre has had a different tread pattern.
Because it was on full maintenance and I didn't get a choice from the leasing company.
All the same make (Pirelli) and all the same size/speed rating/load rating.
But different types, and therefore tread patterns, all round.
Not a problem, and whilst I wouldn't claim to be the fastest driver around I do drive faster than average.
Tread patterns are as much about fashion as anything else.
Michelin employ full-time tread designers.
Not to make the tread work, but to make them look attractive!!!
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