19" Tyre Pressure

dlk001 said:
Runflat performance tire vs. Non Runflat performance tire! Any input on which one is better in terms of handling?
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non run flat is definitely better performance ... standard equipment on an M3 is non run flat while if you take an m-sport 3 series with 19" option it is run flat ... non of the ///M bmw models currently are equipped with run flat

BTW i really don't think a 14" tire and 19" tire will take the same pressure ... the profile on a 19" performance tyre is much smaller meaning less tyre wall ... on my E46 M3 i got a bubble on a brand new tyre simply because my pressure was not correct ... so i really need to know what pressure to put ... esp being at altitude
 
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Depends on your tyres. Max tyre pressure minus 10% is good from what I've read. I've always been advised on 2.5 bar all-round. Also suppose it might be relative to whether it's AWD / FWD / RWD... not sure.
 
I make sure my tires are pumped up to 2.6 bars (235/35's )
 
comment from http://blogs.consumerreports.org/cars/2008/07/tires-save-gas.html



Posted by: Paul R | Jul 21, 2008 3:37:37 PM

I would like to add that tires can safely be inflated beyond the car manufacturer's suggested air pressure. In fact, that Max pressure you see on the sidewall of the tire is perfectly safe and you will see an improvement in fuel economy.
Manufacturers decide on their suggested air pressure by including factors such as ride comfort and noise.
I bought low noise and low rolling resistance tires (Michelin X Radial DT from Sam's) and keep them inflated to 40 psi. Along with the new tires and changes I've made in my driving habits, I get about 23% better mileage on the highway and 30% better mileage in the city.
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adamr said:
Those peeps with 19"s here in SA what tyre pressure do you guys use for the front and rear .. joburg people?

... Michelin PS2's, NOT the runflat kind

front: 8.5Jx19” 245/35 R19, rear: 9.5Jx19” 265/35 R19

currently im putting 2.6 at the rear and 2.4 at the front ...
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Maybe i could ask the guys at BMW Driver Training what the recommended tyre pressure should be, although they run all the M3's on the lightweight 18"s, but i'll ask them anyway.
 
I accidentaly drove over a brick yesterday and it costed me R700 for a new tire and wheel alignment... the tire had a hole in so big you could put your thumb through it!

Never drive over a brick/weird object! not even at 40km/h !
 
dlk001 said:
Runflat performance tire vs. Non Runflat performance tire! Any input on which one is better in terms of handling?
Click to expand...
Depends. Better handling during normal driving or during 180km/h blowout?;)

fusion01 said:
Depends on your tyres. Max tyre pressure minus 10% is good from what I've read. I've always been advised on 2.5 bar all-round. Also suppose it might be relative to whether it's AWD / FWD / RWD... not sure.
Click to expand...
This sounds like the most sensible general rule so far....although I'd be inclined to go with -20%.

adamr: I thought the entire BMW range switched to run-flats.:confused: But I'm not exactly up-to-date on the M's so I'll take your word for it.

I've got a theory: On cars with oversteer, the front tires should be harder compared to the back, while with understeer its the opposite.:)
 
essop1@gp said:
Maybe i could ask the guys at BMW Driver Training what the recommended tyre pressure should be, although they run all the M3's on the lightweight 18"s, but i'll ask them anyway.
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pleeeese do will appreciate that ... my dealer says look at the side by the door ... (its like i know this ... dude)
 
HavocXphere said:
Depends. Better handling during normal driving or during 180km/h blowout?;)


This sounds like the most sensible general rule so far....although I'd be inclined to go with -20%.

adamr: I thought the entire BMW range switched to run-flats.:confused: But I'm not exactly up-to-date on the M's so I'll take your word for it.

I've got a theory: On cars with oversteer, the front tires should be harder compared to the back, while with understeer its the opposite.:)
Click to expand...

all the ///M models dont have runflats ... 147% sure ... the 335i did have runflats
 
adamr said:
pleeeese do will appreciate that ... my dealer says look at the side by the door ... (its like i know this ... dude)
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:D Guess what, the guys at Driver Training just replied to me saying the same thing, check the panel on the door, and make sure that you match the right tyre size, i took a 325 E90 this morning to put some pressure as the tyre pressure monitor was on, did the same thing, but nearly matched the wrong 18" tyre pressure.
But as the dudes at Driver Training are taking these cars to max on the track daily, they obviously use what is indicated on the door panel to keep things at optimal level.
 
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