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Junkyard Kustoms
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Discussion Starter #1
1989 Cadillac Eldorado


It came stock with 195/75/15's (i believe) and now it has 225/60/16's on it. how much will my speedo be out? it has a digital dash, so im not sure of the cahnges it will make.....
 

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Glad the Jeep is on the road
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Let's see, this may not be exactly right but it's close:

stock 195/75-15 -- the tire section is 195 mm wide and it is 75% tall as wide, so thats about 150mm =6" x2 + 15 = 27" tall

new 225 60 16 = 135 mm = 5.4"x2= 10.8 " + 16 = 26.8 --

They might be 2 mph off at 60 but that would be about it.... bet they look a lot better though.....
 

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53fordguy said:
1989 Cadillac Eldorado


It came stock with 195/75/15's (i believe) and now it has 225/60/16's on it. how much will my speedo be out? it has a digital dash, so im not sure of the changes it will make.....
Measurements are in millimeters and converted to inches by dividing by 25.4 (25.4 millimeters in an inch).

195/75/15 tires figures out like this: 195/25.4X.75X2+15=26.51 inches tall.
83.24 inches in diameter. 761.17 revolutions per mile.

225/60/16's: 225/25.4X.60X2+16= 26.63 inches tall.

83.61 inches in diameter. 757.80 revolutions per mile.

You have a tire with nearly .5 percent increase in diameter, you will be around 2 miles per hour faster than what your speedometer reads at nearly 80 miles per hour.

Not enough to really worry about changing anything.
 

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Junkyard Kustoms
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Discussion Starter #5
kilometers that would be And in ?

And in kilometers that would be? haha Wait i guess My car shows both...
 
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