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Discussion Starter #1
I had my speedometer "spot" on when I had rear tire sizes of 235/70-15.

I wanted to lower the rear ride height, so I now have 215/65-15 on the back (3:36 and a 200-4R).

I know my speedometer is now showing higher speeds that what I am actually driving. Any formual to know the difference at any given speed?
 

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You are now going 0.91489361702127659574468085106383 times the speed you used to be going.
Example:60mph speedometer reading is now 54.89361702127659574468085106383
 

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go to bowtie overdrives web sitethey have a tire size/gear ratio calculator and the right gears to make your speedo correct under 20 bucks
 

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do you have or know some one with a garmin or othwer brand of gps unit,usually under 100 bucks, that fishermen use in their boats,they read speed and are pretty acurate, so you can tell if 75 is 65 or vice verses, '
I have used these with good sucess
 

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Discussion Starter #5
I have borrowed a GPS in the past; one that shows MPH.

Guess I may need to invest in one.

Thanks to all for the imput.
 

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I have borrowed a GPS in the past; one that shows MPH.

Guess I may need to invest in one.

Thanks to all for the imput.
my phone has an application for this
 
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