tire sizes
Elder User
Joined: Dec 2004
Posts: 575
Likes: 0
From: Western Pa
Close, but not actually correct...
First off, the first number (265 in this case) is the width of the tire in cm.
The second number (75 or 70 in this case) is the aspect ratio of the tire, expressed in percent. Which basically means that 75% of the tire is between the wheel and the tread.
So the 70-series tire will be lower, but not because of the height, per se.
Though I may not be 100% in my wording, this should answer your question.
First off, the first number (265 in this case) is the width of the tire in cm.
The second number (75 or 70 in this case) is the aspect ratio of the tire, expressed in percent. Which basically means that 75% of the tire is between the wheel and the tread.
So the 70-series tire will be lower, but not because of the height, per se.
Though I may not be 100% in my wording, this should answer your question.
Senior User
Joined: Oct 2004
Posts: 202
Likes: 0
your right about the height. here is a web site to play with the differrent tire sizes
http://www.project33.com/tiresize.cfm
http://www.project33.com/tiresize.cfm
Post Fiend
Joined: Apr 2004
Posts: 6,473
Likes: 4
From: Lafayette, IN
Originally Posted by F15090300
Close, but not actually correct...
First off, the first number (265 in this case) is the width of the tire in cm.
First off, the first number (265 in this case) is the width of the tire in cm.
The second number is height of the sidewall expressed as a percentage of the width. So a 265/70/R16 is 265mm wide (~10.4"), with a sidewall height of about 7.3" (10.4" x 70%), with a rim diameter of 16", that's an overall height of 16" + 2(7.3")=30.6", give or take. Add about another inch to overall height for 75 tires.
Jason
Last edited by jroehl; Nov 29, 2005 at 09:24 PM.
Elder User
Joined: Dec 2004
Posts: 575
Likes: 0
From: Western Pa
Originally Posted by jroehl
In cm?!? That's a pretty wide tire...I'm 183cm tall (that's an even 6' for most of us...). Try millimeters.
The second number is height of the sidewall expressed as a percentage of the width. So a 265/70/R16 is 265mm wide (~10.4"), with a sidewall height of about 7.3" (10.4" x 70%), with a rim diameter of 16", that's an overall height of 16" + 2(7.3")=30.6", give or take. Add about another inch to overall height for 75 tires.
Jason
The second number is height of the sidewall expressed as a percentage of the width. So a 265/70/R16 is 265mm wide (~10.4"), with a sidewall height of about 7.3" (10.4" x 70%), with a rim diameter of 16", that's an overall height of 16" + 2(7.3")=30.6", give or take. Add about another inch to overall height for 75 tires.
Jason
Post Fiend
Joined: Jun 2001
Posts: 5,228
Likes: 5
From: Running Springs CA
Also understand that the 70 will have a lower load capacity than the 75 of the same load range (ply rating). This is due to the difference in internal air volume. Be careful when going to a lower profile tire of the same width, make sure that the load@psi gives you sufficient safety margin (20-25 percent for "P" sizes) for your axle loading.
Jim
Jim
