Tyre pressure

[mamilapon]

Im running 245/45/17's Khumo Ecsta's and im putting recomended pressure for 225/60/15's, That is 200kpa(front) and 240 kpa(rear). Is that good or bad?
Any suggestions?

[Podmore]

200 kpa (a bit less than 30 psi) is too low - you should be running about 36 - 38 psi (250 - 270 kpa) front and 34 - 36 rear, unless carrying a full load or travelling consistent high speed, then put your rears up to 38 - 40 psi. The ride may be a little harsher than you're used to but you'll lessen the risk of cutting your sidewalls or bending the rims on potholes and manhole covers and other crap you might manage to run over.

[Tiger]

I put in 34 PSI front and 37 PSI rear.

[bsell]

I run 40 psi front and 35 psi rear with 235/45/18 tires. I found that running the rears hard (like BMW recommends) is too much for me most of the time. I drive by myself 95% of the time, thus the rear end is very light compared to BMW's thinking.

When the snows are mounted (stock sizes) I keep the same five pound difference, biased to the front for the same reasons. The car handles better with similar tire roll rates.

Brian

[leicesterboy15]

I am running 17s and 18s and run 32 PSI all round, is that too low? I've never had uneven tread as a result of under - inflation

[bmwrp8]

I am running 17s and 18s and run 32 PSI all round, is that too low? I've never had uneven tread as a result of under - inflation

I run 30 all around

[Tiger]

I find that with equal all 4 pressure, the car is very reluctant to turn and rear seems to be pushing the front out of turn... Just try it... increase your rear by 4 psi and see how car responds on the same road you always drive.

It is not about the rear tire being too bouncy... it is about the handling the steering response.

[bmwrp8]

I find that with equal all 4 pressure, the car is very reluctant to turn and rear seems to be pushing the front out of turn... Just try it... increase your rear by 4 psi and see how car responds on the same road you always drive.

It is not about the rear tire being too bouncy... it is about the handling the steering response.

will try thanks for the input

[Ferret]

will try thanks for the input

I tried a 35 front 38 rear combo once, and wont ever do it again - It caught me out twice in one day, the rear end of the car sliding around a roundabout.

I now run it the other way around with 38 up front and 35 at the back. Too much PSI at the back causes the car to yeah, handle well, but when the grip starts to go you've had it. Hard rears on a RWD car is asking for trouble in my opinion...

[bmwrp8]

I tried a 35 front 38 rear combo once, and wont ever do it again - It caught me out twice in one day, the rear end of the car sliding around a roundabout.

I now run it the other way around with 38 up front and 35 at the back. Too much PSI at the back causes the car to yeah, handle well, but when the grip starts to go you've had it. Hard rears on a RWD car is asking for trouble in my opinion...

ill try that also