Zachmac

With a staggered setup the front and rear tires will almost never be exactly the same rolling diameter. They have to be close enough to not trigger ABS as too great a difference will result in to large a RPM difference and make ABS think one set or the other is slipping. The $64k question is how much is too much? What is the maximum difference you can mount between front and rear total rolling diameter and not trigger the ABS?

Zachmac

BTW, concensus among tire rack, my local stealership and a couple of tire shops is that you can run up to 1/2 to 3/4" difference with no problems. As you apporach or exceed 1" delta you can trun into problems with the traction control system due to inherent difference in front versus rear wheel speeds. This is NOT based on anybody's emperical data, just a concensus best guess that seemed to converge on the "don't go to 1 inch difference" camp.

Mka77

That is pretty spot on info. Another figure that has been put out there is not to exceed 3% total difference size wise from OEM.

Zachmac

Sounds partially correct.

Most OEM wheel / tires come out close to 26" rolling diameter so 3% would be about .78 inches, right in the range most "experts" thought you might get enough difference to trigger traction control.

BUT you can vary front AND back as much as you like without ABS problems, you'll just throw off the speedometer and possibly rub. It is DIFFERENCE in rolling dia. between front and back that you have to worry about as far as ABS / traction control. It only looks at the speed each wheel is turning and compares them to each other. I don't think it knows or cares what speed the wheel is turning versus any assumed OEM size tire or wheel?

Mka77

I think the one thing that should be considered here as well is the fact that stagger can also effect the under/over steer. Most, not all staggers are usually 20mm difference in width from front to back OEM. 225/245 for instance. Just something too add.