Tyre pressures and ride quality
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In January, I bought 19" wheels for my BMW 530i M Sport from my local BMW dealer. I was pleased with the purchase as the 19" rims really looked fantatic and suited the car perfectly. I noted that the ride quality had also improved marginally from the 18" runflats I was previosuly running.
To my shame, I didnt bother checking the tyre pressures at all - yes in 10 months....
I was driving back from a work party last night and the idrive came up with a tyre puncture warning. I stoped, checked all the tyres and they all looked good. I was only three miles from home so I decided to risk it and drive home (thinking I probably had a slow puncture of some sort). Reached home safely and in the morning I checked all the tyres again and still no sign of a puncture.
I decided to check the tyre pressures at my local petrol station. The idrive was still pinging warnings at me about the puncture. Readings were as follows -
Driver front - 43psi
Passenger front - 45psi
Rears - 48psi
WTF is all that about? Those numbskulls at the garage had massivley overinflated all the tyres !!!!!
Anyway I bought the pressures down to 32psi for the fronts and 37psi for the rears and reset the idrive. The puncture sign has now gone away but what an improvement in ride quality !!!!
To think I have driving around for over 9 months in substantially overinflated tyres just makes me depressed. It's my fault for not checking the pressures as soon as they installed the wheels.
You guys probably already do this but if you give your car in to a dealer, please always check the pressures after it's been handed back to you.
To my shame, I didnt bother checking the tyre pressures at all - yes in 10 months....
I was driving back from a work party last night and the idrive came up with a tyre puncture warning. I stoped, checked all the tyres and they all looked good. I was only three miles from home so I decided to risk it and drive home (thinking I probably had a slow puncture of some sort). Reached home safely and in the morning I checked all the tyres again and still no sign of a puncture.
I decided to check the tyre pressures at my local petrol station. The idrive was still pinging warnings at me about the puncture. Readings were as follows -
Driver front - 43psi
Passenger front - 45psi
Rears - 48psi
WTF is all that about? Those numbskulls at the garage had massivley overinflated all the tyres !!!!!
Anyway I bought the pressures down to 32psi for the fronts and 37psi for the rears and reset the idrive. The puncture sign has now gone away but what an improvement in ride quality !!!!
To think I have driving around for over 9 months in substantially overinflated tyres just makes me depressed. It's my fault for not checking the pressures as soon as they installed the wheels.
You guys probably already do this but if you give your car in to a dealer, please always check the pressures after it's been handed back to you.
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My Ride: 535d Sport, carbon black, media pack, visibility pack, grey leather, heated seats, sun protection glass, voice control, Eibach ProKit, 19" 166 style wheels, e-maps ECU remap to 325hp and 640NM, top speed limiter removed
looks too high, but wheel tyre combo of 19" and bigger are recommended to being run at the higher end of the pressure field.
Mine (19) are on 38/42 standard and are perfectly fine. Longer trips with the family, I even put a little more in.
Mine (19) are on 38/42 standard and are perfectly fine. Longer trips with the family, I even put a little more in.
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Originally Posted by olli_535d' post='347420' date='Oct 21 2006, 06:37 PM
looks too high, but wheel tyre combo of 19" and bigger are recommended to being run at the higher end of the pressure field.
Mine (19) are on 38/42 standard and are perfectly fine. Longer trips with the family, I even put a little more in.
Mine (19) are on 38/42 standard and are perfectly fine. Longer trips with the family, I even put a little more in.
The sticker on my drivers side doorwell states 2.2 (fronts) and 2.6 bar (rears) when on 19" wheels and with a maximum of 4 passengers. Thats approx 32 and 37 psi.
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Originally Posted by SKK' post='347409' date='Oct 21 2006, 06:13 PM
Driver front - 43psi
Passenger front - 45psi
Rears - 48psi
WTF is all that about? Those numbskulls at the garage had massivley overinflated all the tyres !!!!!
Anyway I bought the pressures down to 32psi for the fronts and 37psi for the rears and reset the idrive. The puncture sign has now gone away but what an improvement in ride quality !!!!
Passenger front - 45psi
Rears - 48psi
WTF is all that about? Those numbskulls at the garage had massivley overinflated all the tyres !!!!!
Anyway I bought the pressures down to 32psi for the fronts and 37psi for the rears and reset the idrive. The puncture sign has now gone away but what an improvement in ride quality !!!!
Just something to bear in mind...
Personally, I have mine set higher than the minimum recommended as I prefer the small sacrifice in ride quality for the sharper handling - experiment between the guidelines... The heavy diesel front seems to prefer a bit more pressure. Plus I've lost the runflats so I reckon a bit more than 'standard' is worth it too! I'm running 37F/38R on 18" staggered.
#6
Check your pressures at least every month. But it's better every 2 weeks. Of course, ckeck BEFORE starting to drive, when the tyres are still cold !
Pressures are advised by BMW so that the car is "easy" (understeering at the limit), and adapted to the set up (camber, toe...). If you prefer to have a more dynamic handling, you can inflate 0.2 bar more (Not too much, because the tyre may then wear more on its center). You'll also use less fuel...
Pressures are advised by BMW so that the car is "easy" (understeering at the limit), and adapted to the set up (camber, toe...). If you prefer to have a more dynamic handling, you can inflate 0.2 bar more (Not too much, because the tyre may then wear more on its center). You'll also use less fuel...
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