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33" tyres in a 16" rim, what size?

General Tech Talk

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33" tyres in a 16" rim, what size?

Post by sidewayz »

hey

just wondering what the equivilant tyre is in a 16" for a 33x12.5x15"

is it 305 70 r16?

thanx in advance

matty
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Post by RoldIT »

Yes, and a 285/75R16.
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Post by Slunnie »

The 285/75-16 is a 33x11.5-16 though.
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Post by sierrajim »

http://www.miata.net/garage/tirecalc.html
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Post by 4runner2.8 »

285's are more a 33.5 there taller then a 305
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Post by rezpkt »

305x70x16 is indeed a 33 x 12.5

A 285 is NOT a 33.5, they are merely 32.8

A 290x75 is more like a 33.2 (jungle trekker)
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Post by sidewayz »

so in QLD a 305x70x16 would be perfectly legal for road use?
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Post by RN »

I am running 275 x 75?? x 16...so would that be classified as 31's???
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Post by -Scott- »

RoadNazi wrote:I am running 275 x 75?? x 16...so would that be classified as 31's???
Over 32" I do believe - which I reckon is illegal!

Where's a cop when you need one. :D
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A speed camera would have prevented that!
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Post by RN »

-Scott- wrote:
RoadNazi wrote:I am running 275 x 75?? x 16...so would that be classified as 31's???
Over 32" I do believe - which I reckon is illegal!

Where's a cop when you need one. :D
Illegal..hardly ???? They were standard factory issue on a L/Cruiser. ;)


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Post by Rogue Patrol »

The formula is.......


width x aspect ratio x2 / 25.4 + rim diameter

275 x .75 = 206.25
x2 = 412.5
/ 25.4 = 16.240157
+ 16 = 32.240157
6" GQ, 37" Treps, that is all.....



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Post by seaeagle »

how much does rim width play a part in choosing tyres
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Post by -Scott- »

RoadNazi wrote:
-Scott- wrote:
RoadNazi wrote:I am running 275 x 75?? x 16...so would that be classified as 31's???
Over 32" I do believe - which I reckon is illegal!

Where's a cop when you need one. :D
Illegal..hardly ???? They were standard factory issue on a L/Cruiser. ;)


Home on the puter..... :roll:
If they were standard issue LC I expect they would be 275/70R16 - a little over 31".
seaeagle wrote:how much does rim width play a part in choosing tyres
Each tyre size has a defined range of suitable rim widths. A tyre fitted to a rim outside that range is considered unroadworthy.
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Post by DavidM »

305/70 and 285/75 have the same diameter, unless you get really picky and go to the 100th degree and then the 285 is .02 inches bigger. In Qld the law states that you can't fit a tyre that is 15mm greater diameter than the largest factory optioned tyre. So yes a 33 inch tyre is illegal as its more than 50mm over the patrols largest tyre. Yet I have never heard of a cruiser or patrol being pinned for 33's during a RWC. Check out the Qld Transport site for Vehicle Modifications and it spells it out for you.

Personally I wouldn't worry too much about it, or you would see every 2nd Cruiser/Patrol off the road with a defect notice from the Qld Transport. By the way your Sidewayz, your Patrol and my Cruiser are almost identical. Factory rust and custom panels
93 80 series ,F/R Air lockers 4 inch lift, 305 Claws. Old & tied, but cant kill it.
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Post by Rogue Patrol »

DavidM wrote: So yes a 33 inch tyre is illegal as its more than 50mm over the patrols largest tyre.
it's 25mm larger but yes, still technically illegal. Largest original fitment is 32".
6" GQ, 37" Treps, that is all.....



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Post by sidewayz »

ok sweet. 305 70 it is

thanx for the info

and david m, hopefully once its back on the road it wont hav so much rust and mayb even some straight panels. for now...
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Post by DavidM »

You're a better man than me. I just live with it. Might explain why my 80 looks like sh*t most of the time. But have owned it for 12 years and know the exact location of every love tap. Getting a teary eye. I think
I will go for a play
93 80 series ,F/R Air lockers 4 inch lift, 305 Claws. Old & tied, but cant kill it.
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Post by midi73 »

Planning on doing her up now are we Matt?
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