tire pressure for 2007 325i sport

[soulasylum]

dear brothers,I've driven 10k of my ride 325i sport and so far haven't been pumping any air into my wheels before.What do you guys feel about average good pressure for our ride?My Rims are double spoke style 193M.Pleased to have your share of advise.

 

[Schwepps]

Bro, how do you go 10k without needing to top-up air? I find that I need to top-up every 2-3 weeks because the pressures drop 0.1 bar all round within that time.

If your ride is shod with the standard 225/40 R18 front and 255/35 R18 rear tyres, the recommended pressures are 2.5 bar (36 psi) front and 2.8 bar (40 psi) rear. That's a bit hard, so I reserve that for long distance highway driving. For normal driving on our horrible pot-holed and rutted roads, I lower them to 34 and 38 psi.

 

[Mouse]

dear brothers,

I've driven 10k of my ride 325i sport and so far haven't been pumping any air into my wheels before.
What do you guys feel about average good pressure for our ride?
My Rims are double spoke style 193M.

Pleased to have your share of advise.

10k and never pump your tyre? u better get a tyre gauge and measure every 2-3 week. that is what i always do and always maintain my pressure

 

[soulasylum]

Omg

Sometimes i feel feeble with the new bmw tire technology.
I remember twice I plug in the air pump in gas station set to 40 psi and to my surprise the actual air inside is more than 40 psi.. so i quickly stop what i am doing hahaha. I feel so ignorant OMG..Probably i have never know how to reset the RFT (never tried once).

My car is 11k now...it'd been to 1st service at SA and 2nd at IA. Probably they "do" check and pump, I hope they do.

Many says the RFT is hard, so far my feeling is still alright..

 

[B33mEr]

for me it's front 36psi rear 40 psi ... for long distance however i reduce it by 2-3 psi cos heat will cause the air to expand

 

[Schwepps]

Sometimes i feel feeble with the new bmw tire technology.
I remember twice I plug in the air pump in gas station set to 40 psi and to my surprise the actual air inside is more than 40 psi.. so i quickly stop what i am doing hahaha. I feel so ignorant OMG..Probably i have never know how to reset the RFT (never tried once).

My car is 11k now...it'd been to 1st service at SA and 2nd at IA. Probably they "do" check and pump, I hope they do.

Many says the RFT is hard, so far my feeling is still alright..

Bro, RFT is not BMW technology and it's not really new. The analogue pumps at most petrol stations are never accurate, and even the digital ones at Shell are suspect if they haven't been calibrated regularly. And checking tire pressures is not on the dealer maintenance checklist - check the service booklet. In fact, during my 10K service, I asked the SC what he thinks of the tire pressures and he didn't even know what are the recommended pressures for the E90! I had to tell him, and he said "Phooo, so high ah?"

Buy a tire guage and use it bro.

 

[soulasylum]

I've got all my answers here..thanks alot bros..

 

[racheltoh]

soulasylum: i've never checked my car air pressure too la. each time i send in for service or some checking, the ppl will do it. furthermore my sifus told me no need to check. just rely on the computer to alarm. i did ask some forumer before...they advised me to check..but i'm lazy lo...

 

[nathan]

Guys and girls,

Let me share with you guys my experience, me too one of those who never check the tire presure, when i took my car first, found the car too bumpy and sent it back to the SC to check on the bumpyness and they told me the tire presure was a bit high and they have reduced it.......and i believed them and was driving the carr all this while (six months) until last week when a friend drove the car and told me that its waay too bumpy and drove it to a tire shop and when they checked the tre presure it was front:48 psi and rear 59 psi.........and the tire shop guy asked me whether i was driving a lorry before this car as only lorries have such high tire presure. So finally after all the guys had a good laugh they adjusted the presure 33 psi and now the ride is much more better.........by the way my ride is a 325 msport......

gonna give my sales guy a hearing next week when i send in the car for some minor works.......

 

[Schwepps]

Not only a hearing but you should sue him bro. I believe 59 is well above the safety limit for normal tires. You could have suffered tire failure or separation at high speed with fatal consequences.

Frankly I don't understand why some of you never check your pressures! Together with your brakes, your tires are the most important components impacting on your safety, especially at high speed. It takes me less than 2 minutes to check all 4 tires. Doing so, I've discovered 3 nails in my tires in this year alone, one of which was in my E90, and which the so-called computer alarm system (RFI) never alerted me to.

 

[soulasylum]

I went to pump last week.
My front was 30 and rear was 34, so i follow u sifu advise and now made it 36:40.
Ride was more bumpy but after few days got used to it, it is more fun.

Side line question: after 3 weeks driving in italy (left hand) and return, immediately first day when i drove my car here in KL. I can't get adjusted so fast and miserably kissed my front left rims with the road side....now dented at the circle abit..

I was wondering is it appropriate to change 1 rim only and is it possible to buy only 1 rim?

 

[MSport]

It takes me less than 2 minutes to check all 4 tires. Doing so, I've discovered 3 nails in my tires in this year alone, one of which was in my E90, and which the so-called computer alarm system (RFI) never alerted me to.

So far the RFI sensor never failed me. I had a nail on my front left and sensor did pick it up. However, I noted from the tire pressure gauge the pressure dropped like 70 kPa upon detection. Did a patch on the inside and now everything is fine again. :top:

Fellow sistas and bros, your tyres are damn important as they are the only contact you have with the road and contact area is no larger than an A4 paper. So, must check regularly! :love:

 

[racheltoh]

ok ok will check tonight.
so for front 35 psi and back 40 is it?????

pls dont say look at the driver side for the guideline cos the guideline is so confusing

 

[t2ribena]

wah driving 10k km without any check on tyre pressure...dangerous lo...based on my experience on checking tyre pressure every week, i can safely say that the tyre will loose the pressure at every moment depending on the condition of use...so afta 10k km normally u will loose almost 5 to 10psi which is dangerous and not good for FC and tyre life...

pls dun rely on the RPA or RFI also as what they do is to monitor the wheel spin difference between each wheel using the abs/wheel sensor but do not monitor or could tell the difference if all the tyre is deflating slowly at the same rate...what it does only alerts u in the event of sudden puncture in one wheels...the tpms feature in some bmw is diffa and so far not market in malaysia yet i think but it might be available as option or on the 7sili...

 

[B33mEr]

ok ok will check tonight.
so for front 35 psi and back 40 is it?????

pls dont say look at the driver side for the guideline cos the guideline is so confusing

For the ladies and family driver please dun do 35/40 psi cos BMW cars are design to understeer for safety sake. front 35psi and rear 40psi is to reduce understeer and promote a slight oversteer. Better put 34-36psi all around for comfort and stability sake, more neutral handling in the wet.

 

[B33mEr]

I went to pump last week.
My front was 30 and rear was 34, so i follow u sifu advise and now made it 36:40.
Ride was more bumpy but after few days got used to it, it is more fun.

Side line question: after 3 weeks driving in italy (left hand) and return, immediately first day when i drove my car here in KL. I can't get adjusted so fast and miserably kissed my front left rims with the road side....now dented at the circle abit..

I was wondering is it appropriate to change 1 rim only and is it possible to buy only 1 rim?

Bro ...send to Hup Soon, further up a bit from AB segambut, they specialise in wheel repair and paint.

 

[Schwepps]

I went to pump last week.
My front was 30 and rear was 34, so i follow u sifu advise and now made it 36:40.
Ride was more bumpy but after few days got used to it, it is more fun.

Side line question: after 3 weeks driving in italy (left hand) and return, immediately first day when i drove my car here in KL. I can't get adjusted so fast and miserably kissed my front left rims with the road side....now dented at the circle abit..

I was wondering is it appropriate to change 1 rim only and is it possible to buy only 1 rim?

But when you set the air pumps at 40, nothing went in. I think the air pumps at most petrol stations are never calibrated since the day they were installed, which may be a decade ago when the station was built. Never rely on them to determine the pressure in your tires.

If you scratched the sides of the rims, it might be only cosmetic damage and not a real dent. As B33mEr says. try repair first. Checking wheel alignment and tire side walls would be the more important task after a side swipe.

 

[Schwepps]

For the ladies and family driver please dun do 35/40 psi cos BMW cars are design to understeer for safety sake. front 35psi and rear 40psi is to reduce understeer and promote a slight oversteer. Better put 34-36psi all around for comfort and stability sake, more neutral handling in the wet.

Bro, thanks for this useful info. :top: However, cars are designed to understeer precisely for the safety of the less competent drivers, because understeer is easier to control and less dangerous than oversteer.

Rachel, you have a 325i Sports, so it's 36-40 per the door pillar sticker.

 

[Schwepps]

gonna give my sales guy a hearing next week when i send in the car for some minor works.......

Nathan, I checked my Bridgestone Potenza sidewalls and the safety warning there says the maximum pressure allowed is 51psi...

 

[B33mEr]

Nathan, I checked my Bridgestone Potenza sidewalls and the safety warning there says the maximum pressure allowed is 51psi...

Bro that is max pressure not the safe operating pressure which is much way less than that ... nathan is correct in wanting to give them an earful...