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Tire size for spedometer calibration

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Old 03-24-2011, 07:59 AM   #1
sean266 [OP] sean266 is offline
MPG? LOL
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Tire size for spedometer calibration

Hello! Newb here with a 09 Tacoma TRD double cab, 5spd auto, rear lockers, a-trac. I'm looking at putting 32" Hancook tires on 17" Procomp wheels here shortly and want to know if I will need to have my speedometer calibrated?? What about gears?
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Old 03-24-2011, 08:18 AM   #2
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tire calculator
You shouldn't have to regear unless it's for personal preference or for a specific use (towing, off roading, etc). Obviously you'll lose a little power with the larger tires but it won't be a dog. This link will tell you how far off your speedo will be with your new tires.
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Old 03-24-2011, 10:12 AM   #4
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Weird...

My speedo was off by 3 mph (too fast) with the stock 265/70-16 Rugged Trails. When I put on the 1" taller 265/75-16 Dynapros, it was spot on.
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Old 03-24-2011, 12:58 PM   #5
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Quote:
Originally Posted by David K View Post
Weird...

My speedo was off by 3 mph (too fast) with the stock 265/70-16 Rugged Trails. When I put on the 1" taller 265/75-16 Dynapros, it was spot on.
Have you verified your speed with a GPS?

The speedo that you see on your dash isn't necessarily accurate. I know my computer (ECU) is accurate againest GPS, but the speedometer that I see on the dash is 2mph fast. I have a Scanguage that reads the ECU.
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Old 03-24-2011, 04:12 PM   #6
sean266 [OP] sean266 is offline
MPG? LOL
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Thanks guys! Are dealerships the only one who can calibrate a speedometer? What would it cost to get that done?
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Old 03-24-2011, 05:22 PM   #7
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Quote:
Originally Posted by Janster View Post
Have you verified your speed with a GPS?
Of course, how else would I know it was off?
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