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some help please :)

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Gaz
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19 Aug 2008 20:28 #113 by Gaz

some help please :) was created by Gaz

im gonna change my tires for some muds,

ive got KL71's in mind .

my question is this :

what is the difference between 30/9.5/15 and 235/75/15 ??? :unsure:

from what i can tell its pretty much the same , price is very similar too .

they both have a 30" diameter, but i dont know what the 9.5 stands for ?? :huh:

many thanks

Gaz

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mlines
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19 Aug 2008 21:12 #114 by mlines

Replied by mlines on topic Re:some help please :)

One is the Imperial (old/American) way of sizing tyres and the other is the metric.

30/9.5x15 stands for 30inch diameter, 9.5 inches width and 15 inch wheel diameter.

235/75/15 stands for 235mm width, 75% aspect ratio and 15 inch wheel diameter.

To convert the metric way backwards....

Take 75% of 235 = 176mm - this is the height of ONE sidewall of the tyre

Double it (because the tyre is round and there a TWO sidewalls in every diameter) = 352mm

Convert millimeters to inches = 352/25 (approximately) = 14.08 inches.

Add onto the 15 inches for the wheel rim = 14.08 + 15 = 29.8 inches.

So a 235/75/15 tyre is 29.8/9.4 x 15 in old money - so is all but the same tyre.

Martin

Martin

2003 M13 early KAP build.
3" Trailmaster lift with 1.5 Spacers on front
Customised winch bumper and roll cage
235/85R16 Maxxis Bighorns on 16" Rims, 4:1 Rocklobster, Rear ARB locker and on-board air
Corrected arms all-round, rear disks, Recaro seats and harnesses

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