Tire size help (BRAIN FART) - The 1947 - Present Chevrolet & GMC Truck Message Board Network

durty harry · 09-14-2011, 09:22 PM

Need some help with tire size , Im taking the 10 inch wheels off the front and putting 8s in its place the tires on it now are 265/50/ 15 and for the life of me I cant remember the calculation I want to keep the same profile

71swb4x4 · 09-14-2011, 09:42 PM

The height is found by taking the middle number as a percentage of the first number. I explained it really bad. Basically with your number the height is 132.5, so 50% of 265.
If your new tire is 235 wide you would want a 235/55/15 which would give you a height of 129.5 (55% of 235).

durty harry · 09-14-2011, 10:00 PM

thats what I was thinking but something told me nope

**lolife99** · 09-14-2011, 10:16 PM

Try using this:
http://www.tacomaworld.com/forum/tirecalc.php

SYCOTIK · 09-15-2011, 12:24 PM

Take the tire width, times that by the aspect ratio as a decimal, times by 2, divide by 25.4 to switch mm to inches, then add the wheel size...
Here's what u have... 265 x .50 x 2 ÷ 25.4 + 15 = 25.43"
Posted via Mobile Device

piecesparts · 09-15-2011, 04:55 PM

Do you want to make it easy????

Use this calculator

http://www.discounttiredirect.com/di...foTireMath.jsp

09-14-2011, 09:22 PM	#1
durty harry Registered User Join Date: Mar 2011 Location: Gainesville, Fl Posts: 178	Tire size help (BRAIN FART) Need some help with tire size , Im taking the 10 inch wheels off the front and putting 8s in its place the tires on it now are 265/50/ 15 and for the life of me I cant remember the calculation I want to keep the same profile __________________ Scott 82 step side aka " Bouncy " 73 GMC Long bed Vortec 5.7

09-14-2011, 09:42 PM	#2
71swb4x4 Senior Member Join Date: Nov 2003 Location: Brookings, SD Posts: 10,497	Re: Tire size help (BRAIN FART) The height is found by taking the middle number as a percentage of the first number. I explained it really bad. Basically with your number the height is 132.5, so 50% of 265. If your new tire is 235 wide you would want a 235/55/15 which would give you a height of 129.5 (55% of 235). __________________ Some people are like slinkies, they aren't good for anything, but you can't help but smile when you see one tumble down the stairs.

09-14-2011, 10:00 PM	#3
durty harry Registered User Join Date: Mar 2011 Location: Gainesville, Fl Posts: 178	Re: Tire size help (BRAIN FART) thats what I was thinking but something told me nope __________________ Scott 82 step side aka " Bouncy " 73 GMC Long bed Vortec 5.7

09-14-2011, 10:16 PM	#4
lolife99 67-72 parts collector,… Join Date: Nov 2002 Location: Mid-MO Posts: 22,690	Re: Tire size help (BRAIN FART) Try using this: http://www.tacomaworld.com/forum/tirecalc.php __________________ Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823

09-15-2011, 12:24 PM	#5
SYCOTIK Registered User Join Date: Feb 2011 Location: Vacaville, CA Posts: 34	Re: Tire size help (BRAIN FART) Take the tire width, times that by the aspect ratio as a decimal, times by 2, divide by 25.4 to switch mm to inches, then add the wheel size... Here's what u have... 265 x .50 x 2 ÷ 25.4 + 15 = 25.43" Posted via Mobile Device

09-15-2011, 04:55 PM	#6
piecesparts Parts and more parts Join Date: Nov 2003 Location: Lebo, Kansas (middle of nowhere Posts: 6,821	Re: Tire size help (BRAIN FART) Do you want to make it easy???? Use this calculator http://www.discounttiredirect.com/di...foTireMath.jsp __________________ Frank



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