Outer Limits 4x4 Board

i had tyres before that were 305/70 16 what size are my new tyre is they are 33x12.5 15 in the other measurement ?

this what u're looking for?

http://www.4lo.com/calc/gearmetric.htm

dirtyGQ wrote:i had tyres before that were 305/70 16 what size are my new tyre is they are 33x12.5 15 in the other measurement ?

According to that link 305/70R16 = 32.8"

Heres another site.

http://www.1010tires.com/TireSizeCalcul ... ion=submit

dirtyGQ wrote:i had tyres before that were 305/70 16 what size are my new tyre is they are 33x12.5 15 in the other measurement ?

305/70-16 IS ALMOST THE SAME AS 33x 12.5-15 VARIES WITH DIFFERENT BRANDS OF TYRES

CHEERS JOHNZ

on the subject of size conversions what is a 7.00 r16 and a 7.50 r16

How do you figure these out

Thanks all now i know

-Mick- wrote:on the subject of size conversions what is a 7.00 r16 and a 7.50 r16

How do you figure these out

Good Question Mick..often wondered this myself. Those sizes are for split rims arent they? Im thinking they might come in 7 or 7.5 inch width and only come in one diameter...whatever size the base model cruisers and nissans with split rims had...not entirely sure tho.

This was my understanding and may be wrong. Technically it's simple..... very similar to the method for metric.



7.5" wide and 7.5" tall tyre (100% aspect) on either side of the rim = 7.5" + 7.5" = 15" + 16" rim = 31"
Most however measure 31.8" (eg 32") - think this is cos the old school is measured as the size of the carcass excluding the tread... eg your size when worn down.

eg: http://www.simextyre.com/Tyres/LS803.asp first 7.50R16 I found in google is 810 mm or 31.89"

They do vary a bit in size as per normal.

Recommended rim size for 7.50R16 is normally 5.5" to 6" wide.

Using the same calculation 7.00R16 = 30" 6.00R16= 28"


Metric goes by something similar, except your main measurement is the tread width not the sidewall height (as there is different aspect ratios). And of course it's in mm.

305/70/16 therefore is 305mm wide = 12"

Sidewall height = 12" x 70% = 8.4"

Therefore sidewall height both sides of rim = 8.4" + 8.4" = 16.8"

16.8" + 16" rim = 32.8"

Clear now?


Now someone explain to me why most 33" tyres are 32.6" I really wanna know how that works......

a 33 is nearly a 285/65 R16

cutzook wrote:a 33 is nearly a 285/65 R16

285/75-16 is approximately 32.8x11.2-16

And the 33x12.5-15 vs 305/70-16; same OD and width, but different aspect ratio = different sidewall height. And the 16" tyres probably have a higher load rating.

Scott

anyone know what a 900x16 is in inches?

34"....

andrew e wrote:anyone know what a 900x16 is in inches?

34

I expect it's 9.00x16 and not 900mm x 16. 900mm is 36", but I've never heard of tyres defined that way.

Scott

dirtyGQ wrote:i had tyres before that were 305/70 16 what size are my new tyre is they are 33x12.5 15 in the other measurement ?

www.google.com