TIres and speedometer problem

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I heard that when u get bigger or smaller tires than the speedometer either shows u going slower or faster, does anything mess with the tachometer, or does that stay the same and exact?
 
yea it doesnt mess with the tach. but depending on how much smaller/bigger your tires are from stock your speedo will be off. for example, when i race at the track i run a 205/50/14 tire, thats significantly smaller so my speedo reads like 100 when im only going 90. also tire size changes your final gear ratio
 
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