AirSpeed VW Community Forums

Technical => Wheel & Tire Forum => Topic started by: egspot on October 06, 2006, 11:28:46 AM

Title: How To Compare Tires?
Post by: egspot on October 06, 2006, 11:28:46 AM

What would be the same as 165R15?

165 60 15 would be 165 wide 60 hight 15 tim?

Title: How To Compare Tires?
Post by: Chris W on October 06, 2006, 11:45:45 AM

Use this to get a idea.

http://www.miata.net/garage/tirecalc.html (http://www.miata.net/garage/tirecalc.html)

Title: How To Compare Tires?
Post by: 68IIIbuggy on October 06, 2006, 11:48:26 AM

A 165r15 is considered an 80 series tire. ie 165 80r 15.

Title: How To Compare Tires?
Post by: egspot on October 06, 2006, 12:10:05 PM

Quote

A 165r15 is considered an 80 series tire. ie 165 80r 15.

Wow!


I was way off. I am trying to match the original diameter or better. I think I got 175 70 15 currently. I wanted to get something just a bit larger and wider.

Title: How To Compare Tires?
Post by: 68IIIbuggy on October 06, 2006, 12:27:09 PM

A stock Vw tire is about 25.5 inches in diameter.

Title: How To Compare Tires?
Post by: silas on October 06, 2006, 08:04:20 PM

Quote

Wow!


I was way off. I am trying to match the original diameter or better. I think I got 175 70 15 currently. I wanted to get something just a bit larger and wider.

175/70/15 = 24.64\"s high

165/80/15 = 25.39\"s high

165mm (the tread width, the area that contacts the road)

80% (the aspect ratio, or sidewall. 80% of 165mm is the sidewall height. then you multiply that # by 2 and add the diameter of the rim to get the total height of the rim & tire combo)

15\" (the rim diameter)

so...

165/80/15 is...

165mm tread width

80% of 165mm = 132mm x 2 = 264mm

divide 264mm by 25.4 (25.4mm = 1\") to get inches = 10.39\"s

add 15\"s of rim diameter to get total rim & tire height of 25.39\"s

all this can be done with a simple calculator or you can play with the link that chris posted.

205/65/15 = 25.49\"s high. very close to the height of a stock rim & tire. but...a 205 is wider than a stock setup by 1.57\"s.

hope that wasnt too confusing. it makes sense to me but i have difficulty explaining things sometimes.  ;)

good luck with the tire search emilio.



 

Title: How To Compare Tires?
Post by: egspot on October 06, 2006, 09:04:30 PM

Quote

Quote

Wow!


I was way off. I am trying to match the original diameter or better. I think I got 175 70 15 currently. I wanted to get something just a bit larger and wider.

175/70/15 = 24.64"s high

165/80/15 = 25.39"s high

165mm (the tread width, the area that contacts the road)

80% (the aspect ratio, or sidewall. 80% of 165mm is the sidewall height. then you multiply that # by 2 and add the diameter of the rim to get the total height of the rim & tire combo)

15" (the rim diameter)

so...

165/80/15 is...

165mm tread width

80% of 165mm = 132mm x 2 = 264mm

divide 264mm by 25.4 (25.4mm = 1") to get inches = 10.39"s

add 15"s of rim diameter to get total rim & tire height of 25.39"s

all this can be done with a simple calculator or you can play with the link that chris posted.

205/65/15 = 25.49"s high. very close to the height of a stock rim & tire. but...a 205 is wider than a stock setup by 1.57"s.

hope that wasnt too confusing. it makes sense to me but i have difficulty explaining things sometimes.  ;)

good luck with the tire search emilio.

Thanks Silas, That was a perfect explanation..