Tyre Pressures with Run Flats/BM's in general
Discussion
Hi all,
I was just wondering what your experiences are like of run flats and their pressures.
Quite simply i checked mine on the 1 series (205/50 17's) and they were all at 32 psi, now according to the book they are mean to be 2bar at the front and 2.5 bar at the rear - ie. around 33/36 as far as i am aware.
Now before i pumped them up the handling was gorgeous, smooth, predictable and no understeer. Now i have pumped them up i have quite a lot of understeer and the rear is more planted.
I much preferred it before, however i was wondering what pressures people run on here? (the last thing i want is a blow out etc for incorrect/too higher pressure etc)
Cheers
Chris
I was just wondering what your experiences are like of run flats and their pressures.
Quite simply i checked mine on the 1 series (205/50 17's) and they were all at 32 psi, now according to the book they are mean to be 2bar at the front and 2.5 bar at the rear - ie. around 33/36 as far as i am aware.
Now before i pumped them up the handling was gorgeous, smooth, predictable and no understeer. Now i have pumped them up i have quite a lot of understeer and the rear is more planted.
I much preferred it before, however i was wondering what pressures people run on here? (the last thing i want is a blow out etc for incorrect/too higher pressure etc)
Cheers
Chris
IIRC I run my 120d M Sport on 2.1 front and 2.3 rear
I found that tyre type makes more difference, the Pirelli Euforias are awful, prone to tramlining and very crashy and wear quickly (17k a set). I switched to Bridgestones and they are much better, no tramlining, softer ride, yet last longer 25k a set.
My other half has just got a 118d M Sport which is running Goodyears, which seem to ride better than the bridgestones (although that could be the difference between a 3 month old 4k car, and a 3 year old 65k car.
I found that tyre type makes more difference, the Pirelli Euforias are awful, prone to tramlining and very crashy and wear quickly (17k a set). I switched to Bridgestones and they are much better, no tramlining, softer ride, yet last longer 25k a set.
My other half has just got a 118d M Sport which is running Goodyears, which seem to ride better than the bridgestones (although that could be the difference between a 3 month old 4k car, and a 3 year old 65k car.
Firstly, have you made sure that the pressure guage you used was accurate?
If so then have you also had the alignment of the car checked?
The problem of underinflated tyres (whether run flat or not) is that tyre wear becomes uneven- however I think a few psi here or there shouldnt make a massive difference. If I were you I would try different pressures til you feel the car is right for you. If these are wihin 2-3 psi of the recommended pressures you should be fine.
If so then have you also had the alignment of the car checked?
The problem of underinflated tyres (whether run flat or not) is that tyre wear becomes uneven- however I think a few psi here or there shouldnt make a massive difference. If I were you I would try different pressures til you feel the car is right for you. If these are wihin 2-3 psi of the recommended pressures you should be fine.
Hmmm interesting, being a company car i cant change from run flats.
These are good years, i will certainly check the pressure's, looking at the diagram, they are appropriately inflated for up to 4 adults and no luggage, i presume this is correct.
I am a real stickler for this and want to make sure these last and drive accordingly!
Thanks
Chris
These are good years, i will certainly check the pressure's, looking at the diagram, they are appropriately inflated for up to 4 adults and no luggage, i presume this is correct.
I am a real stickler for this and want to make sure these last and drive accordingly!
Thanks
Chris
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