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Message: <blockquote data-quote="Marky Dissod" data-source="post: 28152" data-attributes="member: 13218">(I'm ALL for being corrected, but for the rest of this post it's gonna seem like I'm not, even though I am ...)Huh? The ABS system cannot tell if the axle or tire size has changed, unless they have stopped matching each other.ABS / Traction Control & speedometer actually operate independently of each other, despite sharing inputs.All it cares about is that all four tone rings' speeds pretty much match (since we have 4Channel ABS).If one or two of these rings is slower than the others by too much, ABS activates.So long as the tire diameters/circumferences are (very (close) enough), the ABS system will work.I.E.: the difference between 265/65R18, 285/65R17, 265/70R17, & 265/75R16 is not big enough to matter(wheel size does not matter, only tire size matters to the ABS / Traction Control & the Speedometer),so even if you were crazy enough to wear all four of the above on your vehicle,the ABS / Traction Control & speedo would not notice the difference.HOWEVER,If you change the tire size by more than 2% taller or shorter than GM OE, your speedometer will be noticeably off.If the new tires are taller, get the speedo corrected ASAP; a speedo that reads slower than real is potentially dangerous.(OK, now, someone with better tech understanding, please feel free to learn me sumphen.)</blockquote>