How many miles did your tyres last?

[sars]

Thought I would have a quick play, run an unrealistic scenario of an allow wheel, unrealistic in the fact that you cannot have a load over the width of a particular section, so the load is distributed over the entire circumference. The results would be similar to a point, that is to say that the load is only applied to the wheel where contact from the tyre and the tarmac occurs but the deflection would be the same, just not all over the diameter of the wheel.

The rim furthest from the spoke does not necessarily see the most stress because the wall thickness is larger there, as it has to retain the tyre wall. The highest concentrations of stress occur just in from the rim and you can envisage that the crack propagates outwards from there.

 

[roofless]

Sorry sars but i'm colourblind, thankfully; because you lost me on the second line :?

But i will be interested to see if anyone has tried any of the tyres you list

 

[Wondermike]

Mmm nice graph. So the part you should regularly check is the most difficult to access, shame, Wonder if there have been any other cracked 19s on the Z4 - 326 wheels?

 

[ksher]

This is why the inner edge of the tyre wears out slightly more (1mm) than the outer edge.

 

[Maniac]

This is why the inner edge of the tyre wears out slightly more (1mm) than the outer edge.

Not forgetting the camber of course, which helps reduce the tyre life even more.

 

[Z4 Beemer]

Mmm nice graph. So the part you should regularly check is the most difficult to access, shame, Wonder if there have been any other cracked 19s on the Z4 - 326 wheels?

If you look behind and underneath the car you can see roughly half of each wheel. I also tend to try and feel around the rim when I'm washing the car, and cleaning the insides of the rim.

I think the big giveaway is the fact the tyre will start losing air.

Sars, curious to know what package you created the graphic in....!

 

[Breaker]

Replaced my rear tires at around 17,000 miles.

 

[sars]

Mmm nice graph. So the part you should regularly check is the most difficult to access, shame, Wonder if there have been any other cracked 19s on the Z4 - 326 wheels?

If you look behind and underneath the car you can see roughly half of each wheel. I also tend to try and feel around the rim when I'm washing the car, and cleaning the insides of the rim.

I think the big giveaway is the fact the tyre will start losing air.

Sars, curious to know what package you created the graphic in....!

The package is Autodesk Inventor 2012 Professional, it is a 3D CAD package with a lot of extras including Finite Element Analysis and a rendering package so that you, if you wanted too that is, sculpt the body a pretty realistic car.

For those who don't know FEA is a method of stressing 2D or 3D models, so I constructed a 3D model of a 19" wheel, applied a mesh containing about 30,000 cells and then applied a force to it, Inventor simulates the load and calculates the stresses throughout the model, which took about 20 seconds.

The first time I used FEA was during a summer vacation (1989) at the CEGB at Wythanshaw, I spent 3 months stressing an Inlet feed header to a nuclear reactor that had inclusions in its structure, a single run would take 12 hours and the mesh contained a few hundred cells.

 

[roofless]

The package is Autodesk Inventor 2012 Professional, it is a 3D CAD package with a lot of extras including Finite Element Analysis and a rendering package so that you, if you wanted too that is, sculpt the body a pretty realistic car.

For those who don't know FEA is a method of stressing 2D or 3D models, so I constructed a 3D model of a 19" wheel, applied a mesh containing about 30,000 cells and then applied a force to it, Inventor simulates the load and calculates the stresses throughout the model, which took about 20 seconds.

The first time I used FEA was during a summer vacation (1989) at the CEGB at Wythanshaw, I spent 3 months stressing an Inlet feed header to a nuclear reactor that had inclusions in its structure, a single run would take 12 hours and the mesh contained a few hundred cells.

Sars I love it when you talk technical :dizzy: My technical knowledge kind of ends at oiling my whetstone ready to sharpen the axe (and before anybody pipes up - no that isn't a euphemism for anything !!)

 

[Z4 Beemer]

Excellent stuff!

I'm pretty sure you can do Finite Element Analysis in packages such as Matlab and Tecplot which we use extensively at work, but I was pretty sure your screen shot looked different.

 

[Anonymous]

Good thread and interesting reading....

 

[Anonymous]

For those who don't know FEA is a method of stressing 2D or 3D models, so I constructed a 3D model of a 19" wheel, applied a mesh containing about 30,000 cells and then applied a force to it, Inventor simulates the load and calculates the stresses throughout the model, which took about 20 seconds.

The first time I used FEA was during a summer vacation (1989) at the CEGB at Wythanshaw, I spent 3 months stressing an Inlet feed header to a nuclear reactor that had inclusions in its structure, a single run would take 12 hours and the mesh contained a few hundred cells.

Don't you just love it when sars talks dirty

 

[sars]

For those who don't know FEA is a method of stressing 2D or 3D models, so I constructed a 3D model of a 19" wheel, applied a mesh containing about 30,000 cells and then applied a force to it, Inventor simulates the load and calculates the stresses throughout the model, which took about 20 seconds.

The first time I used FEA was during a summer vacation (1989) at the CEGB at Wythanshaw, I spent 3 months stressing an Inlet feed header to a nuclear reactor that had inclusions in its structure, a single run would take 12 hours and the mesh contained a few hundred cells.

Don't you just love it when sars talks dirty

Lol how by any stretch of the imagination was that talk dirty...... oops my bag forgot most of you are guys, where "and" can be taken as nudge nudge wink wink, a nod is as good as a wink to a blind man!

 

[Anonymous]

For those who don't know FEA is a method of stressing 2D or 3D models, so I constructed a 3D model of a 19" wheel, applied a mesh containing about 30,000 cells and then applied a force to it, Inventor simulates the load and calculates the stresses throughout the model, which took about 20 seconds.

The first time I used FEA was during a summer vacation (1989) at the CEGB at Wythanshaw, I spent 3 months stressing an Inlet feed header to a nuclear reactor that had inclusions in its structure, a single run would take 12 hours and the mesh contained a few hundred cells.

Don't you just love it when sars talks dirty

Lol how by any stretch of the imagination was that talk dirty...... oops my bag forgot most of you are guys, where "and" can be taken as nudge nudge wink wink, a nod is as good as a wink to a blind man!

Eating humble pie via a PM

 

[roofless]

Eating humble pie via a PM

Crikey now David Cameron's involved :- this threads bordering on international crisis !! :rofl:

 

[Z_Victor1]

10,500 miles
And.........
Fronts = 5mm
Rears = 3mm

BUT...

I phoned Bridgestone UK today and was told the 3rd Gen RFTs will be supplied to retailers in about 3 weeks
So....here's hoping my rears will last until then.....
Press reports on these new RFTs are good........

 

[ksher]

Can you have 2 new 3rd gen at rear and 2 old at front? Will the mix affect the handling due to different design and materials used?

 

[Mafoo]

Eating humble pie via a PM

Crikey now David Cameron's involved :- this threads bordering on international crisis !! :rofl:

LMAO

 

[mcbeee]

From what i''ve read over the last two years, the chance of cracking a rear 19" 296 is almost nil when using non rft's...(the boys in SoCal seem to be big on this) and with 30k kms on my rears and no cracks found yet I have ordered a set of Conti Sport 3's to be fitted on Friday , all four corners, unfortunately for my wallet

 

[mcbeee]

My rear RFT's ran 30,600kms ..... Got the Conti's on now, bought a BMW Mobility kit and they seem happy so no isues with warranty here.