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Message: [QUOTE="6speedsd, post: 953679, member: 1242"] Been having some confusion about all this. I'm running stock sized tires (245/75/17). Noticed the other day my speedo was off from what the gps stated my actual mph was. Before you say GPS isn't accurate, it has always ran within 1-2mph of my actual speed (checked with AE). My stock sized tires are 31.47" tall, which translates to 641 revs/mile. I went in and manually set my tire size with AE yesterday to 31.5" (again, stock size). Went up the road and my speedo was registering 7-8mph higher than my actual speed. Can't figure out why this is happening. I hooked up the SCT after that, and chose the option to correct speedo for oversized tires. The default setting that it showed was 611 revs/mile! I manually changed it in SCT to 640 revs (yet again, according to my stock sized tires), and it got the speedo within 2-3mph of actual speed. Seems to me my ABS system is somehow calibrated to a taller tire, if that is even possible? I would think changing it manually with AE would correct this, but it doesn't. I hope all this makes sense, as some of my terminology might be off. Anyone have a clue what's going on here? [/QUOTE]

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