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Jet Accu Speed Speedometer calibrator. It adjusts your speedometer for bigger tires or gear change. Only works on automatic transmissions.
Yes, they do.
I have never found a way to "adjust" any speedometer.
when you get bigger tires, or different rear end gears.
Yes, if you get bigger tires it will say you are going slower than you are, and visa versa, you can go to a mechanic to get it recalibrated
Yes, they will affect your speedometer, unless you have it recalibrated (changing internal gears in mechanical models, or reprogramming for ECM controlled units). Same holds true for changing rear end ratios.
Different heights of tire will change the speedometer reading.
You recalibrate it because bigger tires mean different speeds... for example, lets say your car had 14 inch tires... and your speedometer is saying that you are going 50, if you add 20 inch tires which is 6 inches bigger, you might be going around 60-70. No need to get a speeding ticket. Bigger tires cover more road then smaller tires, for example for ever 1 turn from a 20 inch tire is like 1 and ahalf turns from a 14 inch... Hope Ive helped you understand why :)
The 99 tires are much bigger than the 90 tires. With the smaller tires on the 99 you would be going slower than indicated on the speedometer.
definatley.
slightly bigger tires
The size of tires can effect that accuracy of a speedometer. Larger tires will cause the speedometer to read less than you are actually going.