Question about Chevrolet 1500

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I recently put smaller tires on my z71 4x4 and i think my speedometer is off is to fast or to slow?

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It would read fast, use a GPS to determine true speed if u have access to one

Posted on Aug 27, 2010

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Good observation. Changing the tire size increases or decreases the number of wheel spins per mile, and that changes the speedometer reading. GM or a custom truck shop should be able to modify the speedometer drive, but most drivers just note the inaccuracy and learn to live with it.

Bill B

Posted on Aug 27, 2010

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1 Answer

Going to fast in first gear, how do I slow it down


the transmission mod is out
smaller tires will get higher rpms and a bit slower but will not gain much
best if you change the diff ratio to slow it down
of course if you gave more information like make , model , year , type of equipment, you might get a closer answer

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Have you recently replaced tires/rims with smaller than factory supplied? If so you need to change the speedometer gear.

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Is it high or low? Did you put new tires and rims on recently with a bigger or smaller outside diameter? If so then you need to change speedo gears.

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My car tires were the standard size P185 65 R14. They were recently changed to P185 60 R15. Will this cause any problems on this car?


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My speedometer is reading about 10% to fast. What should I check?


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I have a 1989 toyota pickup v 6 4x4. I believe it


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3 Answers

Bigger tires...


Taller tire have more centrifugal force because they have more mass (weight). A body in motion tends to stay in motion. They also have a larger outer diameter therefore through all the weight to the out side of the tire. requiring more energy to accelerate and more energy to slow down than a smaller tire at the same speeds. This is why I would recommend up graded in your brakes and also lowering your gear ratio( numerically higher) if you are going to larger tires. A lower gear ratio will act as a torque multiplier which will get you moving faster up to speed and also adjust your speedometer to be more accurate.
When you go to larger tires your speedometer will be inaccurate because taller tire have large outer diameter. A taller outer diameter tire will travel farther per revolution than a smaller tire. This cause your engine speed to be lower with taller tires because your vehicles tires are moving slower do to it larger outer diameter.
There your vehicle can be re calibrated through the computer. 4wheel parts offers parts call true speed sensors which also recalibrate your speedometer accurately that is the way i would go. Also maybe up grade to larger master cylinder off a 1 ton Chevy and go with some drill and slotted rotors. You most likely will have better braking with these upgrades than you would stock. keep it safe!

Good luck and have fun.

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I I recently went to a government speed awareness workshop (naughty boy!) and asked why all the cars I have recently driven (Vaux Zafira, Vectra, Astra, Honda Accord, Peugeot 106) were indicating a higher speed than my sat-nav. The answer they gave was that car manufacturers will always do this to err on the side of caution for boot-heavy drivers or drivers who neglect to check tyre pressures, so that in a court case they have one less thing to worry about. All these cars indicated about 5-10% over.

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