Curious, with stock gears and 33" tires on my 84, how much would the speedo be off?
Is my speedo off? (1 Viewer)
- Thread starter daveIT
- Start date
This site may earn a commission from merchant affiliate
links, including eBay, Amazon, Skimlinks, and others.
- Thread starter
- #2
Also, wouldn't larger tires throw your odo off? Anyone know how much difference?
I have a simiar setup and divide my odometer milage by .856 to get my true mileage.
For 33 inch tires:
Speedometer and Odometer are both off by ~12%
Larger tires = more turns of the new larger tire to equal 1 revolution like it was with stock tire size.
Say for example I did 230 miles on the trip meter:
That's 230 x 1.12 = 257.6 actual miles
Divide by gallons of gas gets you your MPG's
Your odometer reads slower because of the larger tire size. Same with the speedometer, its off by a percentage, so remember that its just not 5mph slow because there is a big difference between 12% of 30, and 12% of 70.
If you wanted to be really accurate you could measure the actual diameter of your tires vs the stock size for an exact percentage.
Speedometer and Odometer are both off by ~12%
Larger tires = more turns of the new larger tire to equal 1 revolution like it was with stock tire size.
Say for example I did 230 miles on the trip meter:
That's 230 x 1.12 = 257.6 actual miles
Divide by gallons of gas gets you your MPG's
Your odometer reads slower because of the larger tire size. Same with the speedometer, its off by a percentage, so remember that its just not 5mph slow because there is a big difference between 12% of 30, and 12% of 70.
If you wanted to be really accurate you could measure the actual diameter of your tires vs the stock size for an exact percentage.
I thought this was a question about a skimpy European bathing suit?
NeverGiveUpYota
Dare me.
Spike Strip said:I thought this was a question about a skimpy European bathing suit?
Me too! Haha!
- Thread starter
- #7
I thought this was a question about a skimpy European bathing suit?
There would definitely be pics posted if that were the case...
calculator
here's the calculator I use:
Tire size calculator
H78-15 works out to darn near 225/75-15, for stock.
here's the calculator I use:
Tire size calculator
H78-15 works out to darn near 225/75-15, for stock.
