| the ABS won't care. Using two different size wheels cause the front and back to rotate at different speeds. This is basically how the ABS determines if a wheel is locking up. If the difference of speed between the front and back is too great there is the possibility your ABS will come on every time the brakes are applied. Even if the ABS doesn't come on every time the brakes are applied the different sizes can have an adverse affect on the ABS function when it is in use. In order to decrease the potential of adverse affects you can tweak the outer diameter of the tires to be closer to the same. Based on the rims alone there is a 1" difference. by increasing sidewall height of the 18" wheel by 1/4 -1/2" and decreasing the sidewall height of the 19" by the same. This will make the difference between the front and rear within 1/2 to 0" which is a reasonable split between front and back and the visual difference may not be noticeable. -Jason
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