Checking Tyre Pressure

[Schwepps]

aiyo...just 1 post entry...so many replies..and so many words.........
so give me the bottom line

Because you have charisma!

29/33 psi is fine. Just remember to check the pressures regularly. Your report card shows that your alignment and camber were not very far out, so your tyres wore badly due to underinflation, as Manji said.

If and when you call AAM, ask for a flatbed truck rather than a tow truck. Not always available though.

Those tyre sizes Manji gave you are fine.

Why do you want to change all 4 tyres to be the same size? Firstly, it won't look good. Secondly, go and ask IA how much two original BMW 193 rims will cost you, then think again.

 

[MSport]

Rachel, there must be a reason why BMW uses staggered tyres on the Sports model. I speculate that it's more for spirited driving (ala the "Sports" model). Also, F1 cars have staggered tyres..... for better control? :wink:

 

[astroboy]

It doesn't make much different in running cost using all 4 same size in a 325i, but the performance of the car is compromised. Stay stock is always my advise.

Just like sword with sharp surfaces both side, depending on how u look at it. Running a front wider tyre than stock, you will end up with more grip upfront, recipe for oversteer or tail spin, so your DSC works harder and I believe your FC will suffer a bit..

Using a narrower 225 at the rear will not provide you with sufficient grip too despite some improvement in FC and pickup expected, and the 225 will wear out a lot faster then the original 255. If just for the sake of tyre rotation, then your 4x225 will wear out faster than the (2x225+2x255), so running cost wise might be the same. Those bigger tyres might cost more but they last longer.

Wider tyres provide superb grip on the dry but higher chance of aquaplaning..

F1 is running wider rear tyre for more pickup and rear mechanical grip.

The new Star Spoke style 193 M, 18" rim is retailing at over RM2xxx/- at the SC per piece.

Just stay stock.. if you ask me.. .. now can someone please correct me..

 

[Schwepps]

.. now can someone please correct me..

Correct, correct, correct!

So for Rachel to be able to rotate her tyres, she'd have to invest 2xRM2,300 in 225/193Ms and 2xRM800 in 225/PP2 tyres. Total cost to downgrade her setup would be RM6,200.

 

[astroboy]

Phew! Finally got it right for once..

 

[racheltoh]

means its still possible to upgrade? cos we r upgrading the front tyres to be the same like the back??
well...since the design it meant to be...so just stay put. will reconsider this idea 60,000km from now ya...;p

 

[BMWs]

The new Star Spoke style 193 M, 18" rim is retailing at over RM2xxx/- at the SC per piece.

Lim Tayar at TTDI is selling RM4500 for the whole set.

 

[BMWs]

I use (http://www.kouki.co.uk/utilities/visual-tyre-size-calculator) to compare stock
Front 225/40/18 against 235/35/19 = 9.9mm bigger.
Rear 255/35/18 against 265/30/19 = 5.9mm bigger.

Will these set of 19" increase the FC on my car? and also slow down its performance?

 

[astroboy]

I use (http://www.kouki.co.uk/utilities/visual-tyre-size-calculator) to compare stock
Front 225/40/18 against 235/35/19 = 9.9mm bigger.
Rear 255/35/18 against 265/30/19 = 5.9mm bigger.

Will these set of 19" increase the FC on my car? and also slow down its performance?

yes and yes.

But you can take corner a lot faster now, that is if you have been screeching in corners with your 18"s. Now lesser screech, so can push harder. But if you have not been screeching your 18s, the 19s won't help because your 18s still got ample room for u to push. The extra in 19s is only redundant.

In E90 terms, do u often see DSC indicator blinks? That's an indication of needing wider tyres.. :wink:

Bigger wheels are installed for one reason, grip! for both pickup (more grip), taking corners and perhaps braking. Maybe another reason, look! but never because of trying to get better FC.

Ops... conflict! so pickup improve or suffer? Improve because more grip (lesser wheel spin), suffer because the 19"s are heavier. You do the math..

Oh yes, the 19s will be extremely uncomfortable as what JPB puts it, "bone shattering", but u look damn good in 19s.. :wink:

One more, chances of survival for the 19s in Malaysian potholes infested road.. something to ponder upon..

 

[etquah]

yes and yes.

But you can take corner a lot faster now, that is if you have been screeching in corners with your 18"s. Now lesser screech, so can push harder. But if you have not been screeching your 18s, the 19s won't help because your 18s still got ample room for u to push. The extra in 19s is only redundant.

In E90 terms, do u often see DSC indicator blinks? That's an indication of needing wider tyres.. :wink:

Bigger wheels are installed for one reason, grip! for both pickup (more grip), taking corners and perhaps braking. Maybe another reason, look! but never because of trying to get better FC.

Ops... conflict! so pickup improve or suffer? Improve because more grip (lesser wheel spin), suffer because the 19"s are heavier. You do the math..

Oh yes, the 19s will be extremely uncomfortable as what JPB puts it, "bone shattering", but u look damn good in 19s.. :wink:

One more, chances of survival for the 19s in Malaysian potholes infested road.. something to ponder upon..

Astroboy, all the tyres of my E90 -320i are of the same size. Should I rotate the tyre ?

 

[etquah]

yes and yes.

But you can take corner a lot faster now, that is if you have been screeching in corners with your 18"s. Now lesser screech, so can push harder. But if you have not been screeching your 18s, the 19s won't help because your 18s still got ample room for u to push. The extra in 19s is only redundant.

In E90 terms, do u often see DSC indicator blinks? That's an indication of needing wider tyres.. :wink:

Bigger wheels are installed for one reason, grip! for both pickup (more grip), taking corners and perhaps braking. Maybe another reason, look! but never because of trying to get better FC.

Ops... conflict! so pickup improve or suffer? Improve because more grip (lesser wheel spin), suffer because the 19"s are heavier. You do the math..

Oh yes, the 19s will be extremely uncomfortable as what JPB puts it, "bone shattering", but u look damn good in 19s.. :wink:

One more, chances of survival for the 19s in Malaysian potholes infested road.. something to ponder upon..

Astroboy, all the tyres of my E90 -320i are of the same size. Should I rotate the tyres ?

 

[racheltoh]

IMHO, Yes Rotate the tyres.... I learned this trick way back before i got this german bf..

 

[jarance]

Astroboy, all the tyres of my E90 -320i are of the same size. Should I rotate the tyres ?

yes you can rotate your tyres if they are the same size. Take note that of the "rotation" of the tyres.

You may have correct the tyres in front side when you "cross" the tyres.

Take note that not all tyres shop can handle RFT..

More info on directional tyres

 

[jarance]

For more info on tyres try this link..

http://www.ctyres.co.uk/tyre_info/tyre_safety.html

 

[astroboy]

Must understand the reason behind rotating tyres. Its basically to miximise tyre life span to promote uniformity in tyre wear plus to keep all 4 wheels on equal tread thickness to achieve balance in handling the way OEM intended, and when come to changing tyre, all 4 can be changed at one go. So can decide in different tread pattern with out compromising traction balance.

Meaning if your tyres are wearing evenly and equally, then no reason to rotate. Which of course is seldom the case.

Understand your tyre tread pattern and size which also determine whether rotation is possible. Pay attention to directional and asymmetric tread pattern. Directional tread require remount of tyres if you need to do left/right rotation while asymmetric tread must not remount due to its inner and outer tread pattern. CSC2 is asymmetric.

My style (normally not the recommended way.. ), check tyre wear to establish any unevenness in the wear pattern. If any unusual wear is spotted, ask yourself some questions.

1) Would you mind allowing the unusual wear to continue or let it be until next tyre change?
2) Would you like to rectify the alignment/camber to rectify wheel angle or let it be until next tyre change?
3) Do you plan to replace 2 or 4 tyres at one go and when? Budget matter.
4) Are u selling your car soon?
5) Is your car still under warranty? and does that cover alignment?

One very critical information left out when rotation of tyre is involved. Once the tyre is rotated, the tyre surface will not seat to the road surface as well as before due to the different angle of each wheel mount. It takes a while to let the tyre wear in and seat properly to the road surface in their respective new locations. So don't push the car too hard after tyre rotation. This is one reason why performance car mostly won't bother to rotate their tyres, they are on staggered set anyway. So front/rear rotation is not possible.

So will I rotate my CSC2? Maybe..

Again, I might be wrong and usually is..

 

[Schwepps]

Rotating tyres is free when you do off-wheel balancing, so why not do it? I regularly rotate my staggered set left to right on the same axle to change the direction of rotation of both tyres and wheels.

 

[astroboy]

Rotating tyres is free when you do off-wheel balancing, so why not do it? I regularly rotate my staggered set left to right on the same axle to change the direction of rotation of both tyres and wheels.

The problem is I don't even do off-wheel balance at fixed interval.. because my definition is as long as not vibration felt, balancing is not necessary. As long as car not pulling a side, alignment is not necessary. As long as no inner/outer wear, camber is not necessary..

So Schwepps, what's your balancing or alignment interval? For proper maintenance tips, u can trust Schwepps.. :wink:

Mine is shoe string budget method, which eventually can cost more..

 

[Schwepps]

The problem is I don't even do off-wheel balance at fixed interval.. because my definition is as long as not vibration felt, balancing is not necessary. As long as car not pulling a side, alignment is not necessary. As long as no inner/outer wear, camber is not necessary..

So Schwepps, what's your balancing or alignment interval? For proper maintenance tips, u can trust Schwepps.. :wink:

Mine is shoe string budget method, which eventually can cost more..

You're a strange one. So similarly, as long as you don't hear your brakes screeching, changing brake pads is not necessary; as long as you don't hear your v-belt squealing, changing v-belts is not necessary, etc? I agree with being economical, but not when it comes to the component most important to the safety of yourself and others on the road.

A full balancing and alignment job, where they also check your tyres, wheels, and rotate them, only costs RM20 per tyre, which is 1% of the cost of a new RFT. By the time you can SEE uneven wear, you've already scrubbed away 20% or more of your tyre. Needlessly.

My tyre check interval is every quarter, which works out to about 5k since I average 20k a year.

 

[BMWs]

yes and yes.

But you can take corner a lot faster now, that is if you have been screeching in corners with your 18"s. Now lesser screech, so can push harder. But if you have not been screeching your 18s, the 19s won't help because your 18s still got ample room for u to push. The extra in 19s is only redundant.

In E90 terms, do u often see DSC indicator blinks? That's an indication of needing wider tyres.. :wink:

Bigger wheels are installed for one reason, grip! for both pickup (more grip), taking corners and perhaps braking. Maybe another reason, look! but never because of trying to get better FC.

Ops... conflict! so pickup improve or suffer? Improve because more grip (lesser wheel spin), suffer because the 19"s are heavier. You do the math..

Oh yes, the 19s will be extremely uncomfortable as what JPB puts it, "bone shattering", but u look damn good in 19s.. :wink:

One more, chances of survival for the 19s in Malaysian potholes infested road.. something to ponder upon..

My FC has increase from 12.1L/100 to 12.5L/100 since i change to 19" Staggered. The ride is still confortable and not bone shattering as im using H&R springs with ori abs.

Previously i was using Eibach with Bilstein B6 with these 19" setup and yes it was a little bit "bone shattering" but in the corner, can push to the limit til can feel the G's.

BTW is 12.1L/100 normal?

Cheers

 

[etquah]

You're a strange one. So similarly, as long as you don't hear your brakes screeching, changing brake pads is not necessary; as long as you don't hear your v-belt squealing, changing v-belts is not necessary, etc? I agree with being economical, but not when it comes to the component most important to the safety of yourself and others on the road.

A full balancing and alignment job, where they also check your tyres, wheels, and rotate them, only costs RM20 per tyre, which is 1% of the cost of a new RFT. By the time you can SEE uneven wear, you've already scrubbed away 20% or more of your tyre. Needlessly.

My tyre check interval is every quarter, which works out to about 5k since I average 20k a year.

Schwepps, where do you normally do your balancing & alignment ? My tyre is RFT.