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Message started by theikeman on 12/27/05 at 09:45:56

Title: Width vs Heigth question on rear tire
Post by theikeman on 12/27/05 at 09:45:56

There are a number of posts that talk about replacing the rear 140/80/15 with a 140/90/15 for a fatter look and more stable ride. I was under the impression that the first number (140) is the width and the second number (80/90) is for tire heigth. Am I wrong?
Thanks

Ike

Title: Re: Width vs Heigth question on rear tire
Post by Paladin on 12/27/05 at 11:10:35

The numbers are: {width}{aspect ratio}{diameter}

A 140/90-15 is a 140 mm wide tire on a 15 inch rim and is 90% tall:wide.

Which, converted to inches, is 5.5" wide and 24.9" outside diameter.

A 140/80-15 tire would again be 5.5" wide, but only 23.8" outside diameter.

In theory.

The Bridgestone wwebsite lists the diameter and width of various Bridgestone 140/90-15 tires, all on a 3.5" wide rim:

S11: 25.0 x 5.8
G544: 25.2 x 6.0
G702: 25.2 x 5.8 s-speed rated
G702: 25.2 x 5.9 h-speed rated
G508: 25.0 x 5.8
G524: 25.3 x 5.6
G536: 25.2 x 5.8

Dunlop lists, for a 140/90-15 tire:

D404: 24.73 x 5.85 (3.5" rim width)
491 Elite II : 25.1 x 5.7 (3.0" rim width)

Dunlop also lists in 140/80-15 on a 3.0" rim:

K555: 24.2 x 5.9

Bottom line: actual tire sizes, width and height, vary between manufacturers, between tire lines from the same manufacturer, between speed ratings for the same model tire, and (not shown but turst me) the rim width the tire is mounted on.

The Dunlop D404 in 140/90 is only a quarter inch larger in radius than the Dunlop K555 in 140/80. While the Bridgestone 140/90 G524 is over a half inch larger radius.

Title: Re: Width vs Heigth question on rear tire
Post by klx650sm2002 on 12/29/05 at 02:23:15

The 140/70/17 on KLX has a diameter of 24.7"it is on a 4.25" wide rim and actually measures 150.

Clive W :D