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[Dave07997S]

Originally Posted by Longboarder

If you ran smaller tires on the rear, ABS would go out, similar to what happens if the rears are continually spinning and the front's arent but yeah no one's gonna purposefully run smaller rear tires.

Believe what you want but you are wrong.

I've been running a 255/285 setup on my cars since new with no issues. ABS detects wheel lock up, individual wheel lock up.

[Longboarder]

Originally Posted by Dave07997S

Believe what you want but you are wrong.

I've been running a 255/285 setup on my cars since new with no issues. ABS detects wheel lock up, individual wheel lock up.

Bro, read my post...I said smaller REAR tires as compared with fronts. Obviously nobody would do this. But I experienced ABS failure when the rears were continually spinning faster than the fronts on a hot track day.

Go put your 255s on the rear and 285s on the front and drive around for a while and tell me that I'm wrong.

[Richbot]

I my personal experience DSC is very permissive of different diameters from OEM, and obviously width has no effect on sensitivity, though will change the result of interventions by the DSC of course. I have run 245/40 front with 275/40 rear (more than 1" difference in rolling diameter vs. 0.6" stock) and noticed slightly earlier DSC intervention, but only slightly, and no perceptible impact on ABS at all

Of course the emd with less grip will break loose first, usually, duh, but DSC has no way of knowing how wide the tires are. You could run 225/45-18's with 295/35-18s and the DSC would be totally unaffected...until you break traction much more quickly on the end with the 225's on it of course, at which point the dsc intervention will be less than optimal for the available grip since it's calibrated for the OE setup

The system is designed to work well with non-staggered winter setups, worn tires, new tires, and at least 4 oem different tire models. It's not the '90's anymore, DSC has dozens of inputs on top of the 4 wheel speed signals, and enough computing power to use them all. It takes more than a few % rolling diameter difference to trigger an intervention

Setting up a straw man 285f/255r setup for purposes of argument defeats your point anyway, as far as DSC is concerned that is actually more like the OE setup than staggering it properlh becsause the 255's are larger in diameter than the 285's on the "GTS" setup dave is running...

[Dave07997S]

Originally Posted by Longboarder

Bro, read my post...I said smaller REAR tires as compared with fronts. Obviously nobody would do this. But I experienced ABS failure when the rears were continually spinning faster than the fronts on a hot track day.

Go put your 255s on the rear and 285s on the front and drive around for a while and tell me that I'm wrong.

Bro, I've been driving a 255/35/19 front tire and a 285/30/19 rear. The rears are .2" smaller than the rears. No issues with DSC or ABS. Read what Ben from Tire rack says.

You can believe what you want..done with this.

[Longboarder]

Originally Posted by Richbot

I my personal experience DSC is very permissive of different diameters from OEM, and obviously width has no effect on sensitivity, though will change the result of interventions by the DSC of course. I have run 245/40 front with 275/40 rear (more than 1" difference in rolling diameter vs. 0.6" stock) and noticed slightly earlier DSC intervention, but only slightly, and no perceptible impact on ABS at all

Of course the emd with less grip will break loose first, usually, duh, but DSC has no way of knowing how wide the tires are. You could run 225/45-18's with 295/35-18s and the DSC would be totally unaffected...until you break traction much more quickly on the end with the 225's on it of course, at which point the dsc intervention will be less than optimal for the available grip since it's calibrated for the OE setup

The system is designed to work well with non-staggered winter setups, worn tires, new tires, and at least 4 oem different tire models. It's not the '90's anymore, DSC has dozens of inputs on top of the 4 wheel speed signals, and enough computing power to use them all. It takes more than a few % rolling diameter difference to trigger an intervention

Setting up a straw man 285f/255r setup for purposes of argument defeats your point anyway, as far as DSC is concerned that is actually more like the OE setup than staggering it properlh becsause the 255's are larger in diameter than the 285's on the "GTS" setup dave is running...

Originally Posted by Dave07997S

Bro, I've been driving a 255/35/19 front tire and a 285/30/19 rear. The rears are .2" smaller than the rears. No issues with DSC or ABS. Read what Ben from Tire rack says.

You can believe what you want..done with this.

My assumption with a 255 R and 285 F is with tires with the same aspect ratio. A 0.2" difference is obviously negligible.

Again, spinning the rears significantly faster than the fronts caused ABS and DSC failure for me.