Correct tyre pressures

chrissyw · 10-19-2015, 02:44 AM

I've got 18" MV3 M Sport alloys and last year decided to ditch my run flats.

My front tyres seem to have worn very quickly.

What tyre pressures should I be running, same as run flat pressures or not?

Think I'm running 36 psi front 40 psi back.

OGM2LCI · 10-19-2015, 03:18 AM

I'm on non runflats on MV4's and running 2.5 bar front and 2.8 bar rear, not had any issues with this set up

chrissyw · 10-19-2015, 05:40 AM

Quote:

Originally Posted by James-B93

I'm on non runflats on MV4's and running 2.5 bar front and 2.8 bar rear, not had any issues with this set up

Why tyres are you running with?

OGM2LCI · 10-19-2015, 05:49 AM

Quote:

Originally Posted by chrissyw

Why tyres are you running with?

Goodyear Eagle F1's

Aragorn30d · 10-19-2015, 05:52 AM

when you say your tyres have worn quickly, in what way have they worn?

djgandy · 10-19-2015, 06:05 AM

Running F1's myself. Down to 6mm on the rears after 10k. Pretty good IMO for a 335. The fronts will probably last longer than the car lol.

Digitalize · 10-19-2015, 06:52 AM

F1s here, 40/45 is my preference.

Aragorn30d · 10-19-2015, 07:17 AM

40/45 is surely way too high for 18's unless the car is fully loaded?

Be like driving round on marbles!

Digitalize · 10-19-2015, 08:33 AM

Any less and the car just feels wallowy after having RFTs.

OGM2LCI · 10-19-2015, 08:38 AM

I've had pressures of 44psi before, admittedly on 19's but the car felt like it was on bicycle tyres, every tiny input and it felt the car wandered

Dann · 10-19-2015, 03:40 PM

35/37 or 36/38 I can't remember.
Eagle F1s on Mv3s.

pmmcbl · 10-19-2015, 04:18 PM

If you are running the same tyre sizes then the pressure should be the same between run flats and non flats. Dot think I'm missing anything?!

Aragorn30d · 10-19-2015, 04:51 PM

runflats are stiffer, so some people think the tyre pressures need raised when using normal tyres.

I've just went with whatever was on the door. 36/38ish rings a bell. Seems fine to me.

The real tell is how your tyres are wearing. Overinflation will cause the tyre to wear out in the middle. When i bought my car both rear tyres were up around 45-50psi and were badly worn in the middle, so much so that i binned them off.

Digitalize · 10-19-2015, 08:02 PM

Did 15k at 40/45 before taking them off for another set and they were wearing very evenly.

DriverLDN · 10-20-2015, 02:18 AM

I use 36 front / 38 rear for day to day use. If I'm doing a long journey with 4 passengers and a full boot I set the rears to 40.

chrissyw · 10-20-2015, 02:32 AM

Quote:

Originally Posted by Aragorn30d

when you say your tyres have worn quickly, in what way have they worn?

Outside edge towards the wheel arch is bald. Inside has tread left.

So my pressures seem fine then compared to everybody else who has replied on here.

Aragorn30d · 10-20-2015, 02:59 AM

outside edge scrubbing isnt related to pressure.

Its often caused by understeer, or cornering very near the limits of grip (usually worse on the nearside due to roundabouts!) but can also be a sign of insufficient camber or general alignment issues.

Were they decent tyres or cheapies? Mate of mine always used to fit cheapies, and would rip the outer shoulder off them in a few months as he was permanently cornering on the door handles. He swapped to some Eagle F1's and its stopped happening.

chrissyw · 10-20-2015, 03:12 AM

Quote:

Originally Posted by Aragorn30d

outside edge scrubbing isnt related to pressure.

Its often caused by understeer, or cornering very near the limits of grip (usually worse on the nearside due to roundabouts!) but can also be a sign of insufficient camber or general alignment issues.

Were they decent tyres or cheapies? Mate of mine always used to fit cheapies, and would rip the outer shoulder off them in a few months as he was permanently cornering on the door handles. He swapped to some Eagle F1's and its stopped happening.

Pretty sure they are Michelin Exalto's. I'll double check later but they didn't cost me much at all.

I've got Michelin Pilot Sports on the back which are wearing really well so going to fit those on the front. Didn't want to bin them quickly by having incorrect pressures!

Aragorn30d · 10-20-2015, 03:33 AM

Defo get the alignment checked then, i wouldnt expect michelins to wear like that, even if they are the generic everyday tyre rather than the performance one.

chrissyw · 10-20-2015, 03:50 AM

Quote:

Originally Posted by Aragorn30d

Defo get the alignment checked then, i wouldnt expect michelins to wear like that, even if they are the generic everyday tyre rather than the performance one.

Can a tyre place check that or does it need to go to a garage?

Aragorn30d · 10-20-2015, 04:44 AM

a decent bigger tyre place should have the kit, a small place probably wont though.

pmmcbl · 10-20-2015, 01:39 PM

Ensure ou go to a place with a hunter machine.

10-19-2015, 02:44 AM	#1
chrissyw Second Lieutenant 36 Rep 242 Posts Drives: 2006 E90 320d M Sport Join Date: Mar 2014 Location: Midlands iTrader: (0)	Correct tyre pressures I've got 18" MV3 M Sport alloys and last year decided to ditch my run flats. My front tyres seem to have worn very quickly. What tyre pressures should I be running, same as run flat pressures or not? Think I'm running 36 psi front 40 psi back.
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10-19-2015, 03:18 AM	#2
OGM2LCI Lieutenant 45 Rep 439 Posts Drives: E87 M2 LCI Join Date: Oct 2014 Location: UK iTrader: (0)	I'm on non runflats on MV4's and running 2.5 bar front and 2.8 bar rear, not had any issues with this set up
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10-19-2015, 05:52 AM	#5
Aragorn30d Lieutenant Colonel 175 Rep 1,596 Posts Drives: E90 330d Join Date: Mar 2015 Location: Fife iTrader: (0)	when you say your tyres have worn quickly, in what way have they worn?
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10-19-2015, 06:05 AM	#6
djgandy Colonel 146 Rep 2,337 Posts Drives: E93 M3 Join Date: Aug 2012 Location: London iTrader: (0) Garage List 2011 M3 [0.00]	Running F1's myself. Down to 6mm on the rears after 10k. Pretty good IMO for a 335. The fronts will probably last longer than the car lol.
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10-19-2015, 06:52 AM	#7
Digitalize Photographer 412 Rep 2,643 Posts Drives: 320D Join Date: Jun 2013 Location: UK iTrader: (0)	F1s here, 40/45 is my preference.
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10-19-2015, 07:17 AM	#8
Aragorn30d Lieutenant Colonel 175 Rep 1,596 Posts Drives: E90 330d Join Date: Mar 2015 Location: Fife iTrader: (0)	40/45 is surely way too high for 18's unless the car is fully loaded? Be like driving round on marbles!
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10-19-2015, 08:33 AM	#9
Digitalize Photographer 412 Rep 2,643 Posts Drives: 320D Join Date: Jun 2013 Location: UK iTrader: (0)	Any less and the car just feels wallowy after having RFTs.
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10-19-2015, 08:38 AM	#10
OGM2LCI Lieutenant 45 Rep 439 Posts Drives: E87 M2 LCI Join Date: Oct 2014 Location: UK iTrader: (0)	I've had pressures of 44psi before, admittedly on 19's but the car felt like it was on bicycle tyres, every tiny input and it felt the car wandered
	Appreciate 0 Quote

10-19-2015, 03:40 PM	#11
Dann Major 133 Rep 1,381 Posts Drives: E90 LCi 335i Join Date: Feb 2015 Location: Portsmouth, United Kingdom iTrader: (0)	35/37 or 36/38 I can't remember. Eagle F1s on Mv3s.
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10-19-2015, 04:18 PM	#12
pmmcbl Lieutenant 35 Rep 435 Posts Drives: E91 335i M-Sport Join Date: Aug 2015 Location: Berkshire iTrader: (0)	If you are running the same tyre sizes then the pressure should be the same between run flats and non flats. Dot think I'm missing anything?!
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10-19-2015, 04:51 PM	#13
Aragorn30d Lieutenant Colonel 175 Rep 1,596 Posts Drives: E90 330d Join Date: Mar 2015 Location: Fife iTrader: (0)	runflats are stiffer, so some people think the tyre pressures need raised when using normal tyres. I've just went with whatever was on the door. 36/38ish rings a bell. Seems fine to me. The real tell is how your tyres are wearing. Overinflation will cause the tyre to wear out in the middle. When i bought my car both rear tyres were up around 45-50psi and were badly worn in the middle, so much so that i binned them off.
	Appreciate 0 Quote

10-19-2015, 08:02 PM	#14
Digitalize Photographer 412 Rep 2,643 Posts Drives: 320D Join Date: Jun 2013 Location: UK iTrader: (0)	Did 15k at 40/45 before taking them off for another set and they were wearing very evenly.
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10-20-2015, 02:18 AM	#15
DriverLDN First Lieutenant 50 Rep 302 Posts Drives: BMW 330i M Sport E90 2006 Join Date: Apr 2015 Location: Croydon iTrader: (0)	I use 36 front / 38 rear for day to day use. If I'm doing a long journey with 4 passengers and a full boot I set the rears to 40. __________________
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10-20-2015, 02:59 AM	#17
Aragorn30d Lieutenant Colonel 175 Rep 1,596 Posts Drives: E90 330d Join Date: Mar 2015 Location: Fife iTrader: (0)	outside edge scrubbing isnt related to pressure. Its often caused by understeer, or cornering very near the limits of grip (usually worse on the nearside due to roundabouts!) but can also be a sign of insufficient camber or general alignment issues. Were they decent tyres or cheapies? Mate of mine always used to fit cheapies, and would rip the outer shoulder off them in a few months as he was permanently cornering on the door handles. He swapped to some Eagle F1's and its stopped happening.
	Appreciate 0 Quote

10-20-2015, 03:33 AM	#19
Aragorn30d Lieutenant Colonel 175 Rep 1,596 Posts Drives: E90 330d Join Date: Mar 2015 Location: Fife iTrader: (0)	Defo get the alignment checked then, i wouldnt expect michelins to wear like that, even if they are the generic everyday tyre rather than the performance one.
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10-20-2015, 04:44 AM	#21
Aragorn30d Lieutenant Colonel 175 Rep 1,596 Posts Drives: E90 330d Join Date: Mar 2015 Location: Fife iTrader: (0)	a decent bigger tyre place should have the kit, a small place probably wont though.
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10-20-2015, 01:39 PM	#22
pmmcbl Lieutenant 35 Rep 435 Posts Drives: E91 335i M-Sport Join Date: Aug 2015 Location: Berkshire iTrader: (0)	Ensure ou go to a place with a hunter machine.
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