Math question.

myke

Well-Known Member

Jul 18, 2022

• #1

Tire size changing speedometer,
265 75 16. 265mm width 75% of 265 is height.

Want to change to 245 75 16, How much will this change my speedometer?

My stoner mind cant compute.

 

bam0813

Well-Known Member

Jul 18, 2022

• #2

245/75-R16 vs 265/75-R16 Tire Comparison - Tire Size Calculator | Tacoma World

265/75-R16 tires are 1.18 inches (30 mm) larger in diameter than 245/75-R16 tires and the speedometer difference is 3.8%

www.tacomaworld.com

 

Laughing Grass

Well-Known Member

Jul 18, 2022

• #3

.98

65mph = 63.39mph

 

bam0813

Well-Known Member

Jul 18, 2022

• #4

Mine neither

 

myke

Well-Known Member

Jul 18, 2022

• #5

So at 1000mph my speed will actually be 962.68 mph.
Good to know.

 

bam0813

Well-Known Member

Jul 18, 2022

• #6

Use the gps shouldn’t matter

 

myke

Well-Known Member

Jul 18, 2022

• #7

So if I go 30K miles ,Ill be getting ripped off.My truck will have less miles then what the odometer says.

So I should disconnect my speedometer every once in awhile right? Just to keep things honest.

 

O

orangejesus

Well-Known Member

Jul 18, 2022

• #8

myke said:

Tire size changing speedometer,
265 75 16. 265mm width 75% of 265 is height.

Want to change to 245 75 16, How much will this change my speedometer?

My stoner mind cant compute.

Click to expand...

why do you want to do this?

 

myke

Well-Known Member

Jul 18, 2022

• #9

Original tire size is 245. GPS Speedo says maybe 2-3 mph out. So I don’t know if it’s been re calibrated. Or how accurate the gps Speedo is.
New used truck has worn 265. So debating on which new tire size I’ll get. Most likely the 245.

 

O

orangejesus

Well-Known Member

Jul 18, 2022

• #10

get the tire size specified by the vehicle manufacture; speedo should be calibrated for that size.

 

bam0813

Well-Known Member

Jul 18, 2022

• #11

Pretty sure he knows that, he wants to change size

 

buckaclark

Well-Known Member

Jul 18, 2022

• #12

Bout a pound