Tyre Sizes, Again!

Submitted: Thursday, Dec 29, 2005 at 11:54

ThreadID: 29232 Views:6993 Replies:4 FollowUps:9

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Snowy 3.0iTD

I know this issue has been done to death on this forum so I will cut straight to the point. After speaking to Nissan Australia this morning I have ordered a proper Nissan tyre placcard for 265/75 R16 tyres to sit alongside the original 265/70 R16 placcard. I know it is not a huge increase in size but for $18 the extra flexibility in tyre selection, and money it will save me on tyre purchase price, I consider it well worth the money. I am not sure what other manufacturers do, but with Nissan if it mentions a tyre size in the manual then you can probably get a placcard for it. Hope this helps some people out there.

Kind Regards

Snowy

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Reply By: Hardo - Thursday, Dec 29, 2005 at 12:49

Thursday, Dec 29, 2005 at 12:49

Snowy
What do you need the placard for? Is there a law that states you have to have the correct placard to match the tyres? Isn't there a percentage increase rule? Maybe all the people running bigger than 265/70/R16 are breaking the law?

Hardo

AnswerID: 145873

Follow Up By: Snowy 3.0iTD - Thursday, Dec 29, 2005 at 14:02

Thursday, Dec 29, 2005 at 14:02

Hardo

A quick search of this forum will turn up many threads on this subject, but to set you straight after having done a bit of research on this myself in all states except WA: a vehicle is illegal/unroadworthy if the rolling diameter of its tyres is greater than 15mm above the rolling diameter of the tyres on the ADR approved tyre placard. Hence on a Nissan Patrol with a tyre size of 265/70 R16 (793mm) on the placard it is illegal to run 265/75 R16 (820mm), let alone anything bigger. If you happen to have a major accident where people are injured in an unroadworthy vehicle the consequences are dire.

Snowy

FollowupID: 399383

Follow Up By: Hardo - Thursday, Dec 29, 2005 at 14:30

Thursday, Dec 29, 2005 at 14:30

Thanks for the info Snowy

FollowupID: 399391

Follow Up By: Exploder - Thursday, Dec 29, 2005 at 20:38

Thursday, Dec 29, 2005 at 20:38

Go WA!!!!

FollowupID: 399419

Follow Up By: sudsy - Saturday, Dec 31, 2005 at 13:13

Saturday, Dec 31, 2005 at 13:13

I think you will find that you can go up to 50mm above the rolling diameter stated on the placard with a 4wd vehicle. ( giving a 1" lift)

I think that 15mm rule applies to 2wd passenger cars. This is what I read in the new code of practice anyway.
But then with all of todays "crossover" vehicles and softroaders what defines a 4wd these days?

FollowupID: 399643

Reply By: tonysmc - Thursday, Dec 29, 2005 at 19:58

Thursday, Dec 29, 2005 at 19:58

Hi Snowy. I am just about to purchase new tyres so I read your post with much interest. After looking at my tyre placcard it reads 235/75 R15 or 265/70 R15.
Does this mean it is ok to run a 265/75 R15? I did notice you were talking about
R 16's not 15's, so maybe the range isn't as good.

Cheers Tony.

AnswerID: 145929

Follow Up By: Exploder - Thursday, Dec 29, 2005 at 20:41

Thursday, Dec 29, 2005 at 20:41

265/70R15, can you even buy that??

I thought after 235/75R15 the measurement changed to Inches I.E LT31/10.5R15

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Follow Up By: Snowy 3.0iTD - Friday, Dec 30, 2005 at 08:32

Friday, Dec 30, 2005 at 08:32

Tonysmc

265/70 R15 is a rather unusual size, I have seen tyres around in this size but wondered who ran them. As for 265/75 R15 I must admit I have not seen them around or heard of them, but assuming you can get them, 265/75 R15 to 265/70 R15:

Tyre width [mm] x Aspect ratio x 2 + (rim size [in] x 26.4 [mm/inch]) = tyre diameter [mm]

265 x 0.75 x 2 + (15 x 26.4) = 793.5mm,

while 265 x 0.7 x 2 + (15 x 26.4) = 767mm,

then 793.5 - 767 = 26.5mm

which is more than 15mm and hence illegal. Which is why I was happy to discover that Nissan do a proper placard for the larger tyres.

Regards Snowy

FollowupID: 399485

Follow Up By: tonysmc - Friday, Dec 30, 2005 at 21:25

Friday, Dec 30, 2005 at 21:25

Thanks Guys, I know stuff all about tyres as I have mostly had 31/10.5R15's, thats why I asked about sizes and I don't know if they even make a 265/75R15 and I was just trying to get some info before laying out the cash. Exploder, as for the 265/70R15's, I have them on the car at the moment and yes you can get them at all the places I have asked. Mine are bridgestone Dueler's

Regards Tony.

FollowupID: 399570

Reply By: Willem - Thursday, Dec 29, 2005 at 21:04

Thursday, Dec 29, 2005 at 21:04

It had never crossed my mind....but I went to have a look for interests sake and the tyre placard is illegible due to stuff rubbing against it in the glovebox.

The GQ is also rated 265/70/16 but I have been running 265/75/16 for a while now. When I bought it second hand it had 265/75/16 tyres and I did not question it. Thought it was the norm.

It doesn't worry me now however, as if there is a remote possibility of a liability claim against me some time in the future, I will worry about it then.

AnswerID: 145933

Reply By: Patrick - Friday, Jan 13, 2006 at 15:00

Friday, Jan 13, 2006 at 15:00

Snowy 3.0iTD,

RE: Patrol Y61 replacement tyre placard.

My local Nissan dealeris having problems trying to find the tyre placard you obtained from Nissan Australia to cover the 265/75/R16 re-sizing. Are you able to have a look at your placcard and let me know what the part / item number is, so that I can pass this onto my guys. I understand that it is printed on the sticker itself.

Thanks in advance.

Patrick

AnswerID: 148315

Follow Up By: Snowy 3.0iTD - Friday, Jan 13, 2006 at 19:46

Friday, Jan 13, 2006 at 19:46

Patrick

The part number as it appears on my receipt is NI-99090-VB000A, although I don't think you need to quote the NI. Cost me $15.

Regards

Snowy

FollowupID: 401652