tyre size ???????? conversion ?

Post by **dirtyGQ** » Thu Feb 23, 2006 3:20 pm

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 ?

Post by **RAY185** » Thu Feb 23, 2006 3:51 pm

this what u're looking for?

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

Post by **RAY185** » Thu Feb 23, 2006 3:52 pm

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"

Post by **saigo** » Thu Feb 23, 2006 4:06 pm

Heres another site.

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

Post by **JOHNZ** » Thu Feb 23, 2006 4:21 pm

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

Post by **-Mick-** » Thu Feb 23, 2006 5:22 pm

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

How do you figure these out

Post by **dirtyGQ** » Thu Feb 23, 2006 5:32 pm

Thanks all now i know

Post by **Nev** » Thu Feb 23, 2006 6:17 pm

-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.

Post by **Beastmavster** » Thu Feb 23, 2006 6:33 pm

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......

Post by **cutzook** » Thu Feb 23, 2006 6:34 pm

a 33 is nearly a 285/65 R16

Post by **-Scott-** » Thu Feb 23, 2006 8:40 pm

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

Post by **andrew e** » Thu Feb 23, 2006 10:00 pm

anyone know what a 900x16 is in inches?

Post by **Beastmavster** » Thu Feb 23, 2006 10:37 pm

34"....

Post by **GRIMACE** » Fri Feb 24, 2006 1:02 pm

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

34

Post by **-Scott-** » Fri Feb 24, 2006 2:31 pm

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

Post by **bogged** » Fri Feb 24, 2006 2:41 pm

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

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tyre size ???????? conversion ?

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