Question about the spedometer
#1
Question about the spedometer
So I've got the new 35's on and I haven't had my speedo calibrated. Does that mean I'm going slower than it says? If so does that mean it's registering more miles than I'm really going? My MPG has gone down about .5mpg but to be honest I don't know if that's because the odometer is off. TIA
#2
i dont remember what size the stock tires are off hand. i put 275/65R17 in a calculator, and used the tires in your sig. came up with vehicle speed of 71.876 w/ speedo reading 65, and when vehicle speed is 65, speedo read 58.782.
and yes you need it recalibrated. computers (mainly ABS) still think you have stock tires.
and yes you need it recalibrated. computers (mainly ABS) still think you have stock tires.
#4
the speedo counts rotations of the wheels through the transmission. for each rotation of the tires, the speedo adds a set certain distance to your odometer. a larger tire diameter rolls a longer distance for each rotation, so your speedo will see that as going slower than you really are, and covering less distance. i know bf goodrich has a tool for figuring this out on their website, i'm sure you can find a few others by searching around.
#5
Stock TRX4 tires are 275/70/17. Your dealer can fix your speedometer reading. They should do it cheap or free if you have a good relationship with them. When I put 305/70/17 Wrangler MT/R's on my 03 off road ram i went back and they did it for free.
Last edited by BubbaRadioNetwork; 05-20-2009 at 06:32 PM.
#7
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#9
If you want to see the speedometer / odometer changes made by a specific tire size change, try one of the online calculators:
DML Tire and Wheel Calculator
DML Tire and Wheel Calculator