Basic tyre education please

[kitacooch]

Hi there, just wondering if someone would be kind enough to give me a quik education on what the tyre measurements etc on side wall mean.
I undersatand as the following.
265 70 R16
265 is 265mm measurement of the total width of tyre.
70 means that the wall height is 70% of the tyre width.
R16, is the rim size.

does this mean i cannot run 265 70 r16 and 235 70 r16 together as the wall heights will be different?

how do you convert to inches eg 265 70 R16 i beleive to be close to 31's??

any confirmation would be helpful
cheers

[Pedro_The_Swift]

http://www.aulro.com/afvb/good-oil/

[kitacooch]

Cheers mate but the link is broken, i will do a search what i shoulda done first

[Pedro_The_Swift]

nope,, it was me:angel:

try it again,,,

[gazk]

This site explains all about the tyre markings and a lot more:
Car Bibles : The Wheel and Tyre Bible Page 1 of 2 (http://www.carbibles.com/tyre_bible.html)

regards

[frantic]

1 inch is about 25mm so 265= 10.5 inches roughly and the 70 means 7.25 in. height tread to bead x 2 + rim16=30.5 in tyre dia. at a rough calc off the top off my head.

[slug_burner]

total diameter of tyre is 2 wall hieghts plus the hole in the middle normaly filled by the wheel.

265mm divided by 25.4mm will give you inches of tyre width =10.43"

wall height is in your case 70% of the 10.43 = 7.303

2 x 7.303 + 16( wheel size) = 30.6"

as frantic said 10.5 x 31 is close enough for government work

[DeanoH]

Found this to be good

www.exploroz.com/Vehicle/Tyres/SizeCalc.aspx

Deano

[kitacooch]

cheers for that guys, i now understand.