D3 Tyre choice

[Redback]

OK we are choosing tyres to get prices for leasing a D3, talk about doing my head in:eek:

I found 275/65/18s in Mickey Thompson ATZ 5 rib, are they too wide and are they too tall at 814.7mm (32.1") will they rub.

What's the biggest we can go without rubbing or affecting the terrain responce (I have heard too tall will affect this)

Baz.

[~Rich~]

I run 285 / 60 R18 Cooper LTZ Zions. They are about 796mm O/A.
Cooper Tires - Tyres (http://www.coopertires.com.au/index.php?page=tyres&tyre_id=9)
Just some light rubbing at the front of the rear wheel arches at full compression.
Otherwise a great all round tyre. ( $445 each though :( )
You can get the spare to fit with some pushing if you deflate it first though.

[Discophil]

I fitted a set of Cooper HT Plus 265/60/18 a couple of months ago. No rubbing, very happy with them. As quiet as the continentals but hoping they will last a lot longer. Going a bit taller certainly softens the ride as well i have found.

[Bushwanderer]

Hi Redback,
I run 265/70-17 BFGs (which are bigger than standard).

As a comparison: Sidewall (mm) Radius (mm) Diff (%)
Standard 235/70-17 164 380 0.0
Mine 265/70-17 186 401 5.5
Yours
(LTZ) 275/65-18 179 407 7.1

As you can see above, my BFGs have a 21mm larger radius. They just, periodically, rubbed the rear wheel arch in "normal" height and had to be deflated to fit in the spare wheel well. Later D3s (2007 on?) had an extra protuberance in the rear wheel arch which would have made the BFGs unsuitable without some judicious "panel beating".

I believe that the LTZs (at about 27mm greater radius than standard - not to mention the greater width) will not fit - front or rear.

HTH,
Peter

[~Rich~]

Hi Redback,
I run 265/70-17 BFGs (which are bigger than standard).

As a comparison: Sidewall (mm) Radius (mm) Diff (%)
Standard 235/70-17 164 380 0.0
Mine 265/70-17 186 401 5.5
Yours
(LTZ) 275/65-18 179 407 7.1

As you can see above, my BFGs have a 21mm larger radius. They just, periodically, rubbed the rear wheel arch in "normal" height and had to be deflated to fit in the spare wheel well. Later D3s (2007 on?) had an extra protuberance in the rear wheel arch which would have made the BFGs unsuitable without some judicious "panel beating".

I believe that the LTZs (at about 27mm greater radius than standard - not to mention the greater width) will not fit - front or rear.

HTH,
Peter

Hmmm, the 285 / 60 R 18's LTZ's definitely fit!
https://www.aulro.com/afvb/images/imported/2011/03/514.jpg https://www.aulro.com/afvb/images/imported/2011/03/515.jpg

[TerryO]

Hey Rich,

the Coopers look the goods, if you don't mind I would like to check them out on the D3. If I'm not being to cheeky where abouts in Sydney are you?

cheers,
Terry

[Disco4SE]

I run 285 / 60 R18 Cooper LTZ Zions. They are about 796mm O/A.
Cooper Tires - Tyres (http://www.coopertires.com.au/index.php?page=tyres&tyre_id=9)
Just some light rubbing at the front of the rear wheel arches at full compression.
Otherwise a great all round tyre. ( $445 each though :( )
You can get the spare to fit with some pushing if you deflate it first though.
Hi Rich,
How do you find the road noise compared to originals?
They certainly look good.
Cheers, Craig.

[~Rich~]

Thanks Terry & Craig,
I have a set of 19" standard Goodyears which are my "On Road" set currently on the vehicle.
I swap them over to the LTZ's when hitting the dirt. The LTZ's are oversize and are not really legal unless you get your D3 inspected by a Automotive Engineer. That is another reason to have 2 sets!
They are only slightly noisier than the standard tyres but with wear will become more noisy.
My speedo is more accurate with the LTZ's on. :D

[Redback]

Thanks everyone for your replys, I have finally got my head around this sizing thing and that the first number doesn't always determin the width, it's a combination of all the numbers that determin width and height (took a while I know;):p)

I would really like those 285s, but as they rub on the inner chassis, rubbing on the plastic isn't an issue as you can usually move that, I really don't think it's a good idea being that the car will be predominantly a tourer and daily driver, and we won't have a second set of rims, well not yet anyway.

So thanks again everyone, especially the guys that PMed me,

Baz

[Bushwanderer]

Hmmm, the 285 / 60 R 18's LTZ's definitely fit!


Hi ~Rich~,
I put your tyres (285/60-18) into the calculator and came up with:
171mm sidewall, 400mm radius and 5.0% size difference
and so your tyres have no bigger radius than my BFGs.

For completeness, I also put the stock 18" tyres in (IIRC 255/60-18)
they give 153mm, 382mm and 0.3% diff, respectively, and so you can see that the size of the stock 18" tyres are virtually identical to the 17" ones.

Having said that, I'm amazed that your 285mm tyres don't rub on the chassis or front suspension. Have you, or others, adjusted the bump stops?

Best Wishes,
Peter

[Redback]

Hi ~Rich~,
I put your tyres (285/60-18) into the calculator and came up with:
171mm sidewall, 400mm radius and 5.0% size difference
and so your tyres have no bigger radius than my BFGs.

For completeness, I also put the stock 18" tyres in (IIRC 255/60-18)
they give 153mm, 382mm and 0.3% diff, respectively, and so you can see that the size of the stock 18" tyres are virtually identical to the 17" ones.

Having said that, I'm amazed that your 285mm tyres don't rub on the chassis or front suspension. Have you, or others, adjusted the bump stops?

Best Wishes,
Peter

Hi Peter, I was told they do rub there, hence my comment in my above post for not getting them, if it was only the plastic they rubbed on, that would be fine, but when they rub on unmoveable components, then not for me.

Baz.

[TerryO]

My intention is not to offend anyone with what I'm about to say so please no one take it personal.

My point is this forum is great for garnering excellent information on any number of important issues with our vehicles and taht is its intended purpose.
If a question / topic is raised as a discussion point would it not be better for all members if all comments relating to the topic are put up on the thread rather then some people PMing each other?

For example if 285/60/18's rub somewhere on a D3 that they shouldn't, as seems to be the case here, then why only tell one person by a PM?

Why not let everyone know and at the least then the point can be discussed.

As I said my comments aren't meant to be offensive to anyone, I just thought I'd raise this point so hopefully everyone gets to learn something important rather then just one or two.


cheers,
Terry

[~Rich~]

Hi Peter, Terry & Baz.
I have no rubbing what so ever at the front end when using any of the standard suspension settings including Access mode.
However when using my LLAMS set at -20 and Access mode I suspect they would rub on full lock only.
I'll dig out a photo of the clearance between the top control arm and the tyre, it's only about 10mm but have had no issues at any time on or off road with rubbing.
Having said that there is no way of fitting snow chains on the front tyres!

https://www.aulro.com/afvb/images/imported/2011/03/486.jpg

[TerryO]

Thanks Rich, still wouldn't mind having a look at them on your D3 if possibe.

cheers,
Terry

[~Rich~]

As I mentioned Terry the LTZ's are currently off the D3 as I'm doing nearly 800k a week on Tarmac!
I'll put them back on when I'm going off road again.
At this stage it's looking like the end of April that will be when I swap!

[biggin]

Thanks everyone for your replys, I have finally got my head around this sizing thing and that the first number doesn't always determin the width, it's a combination of all the numbers that determin width and height (took a while I know;):p)


Baz

Hey Baz,
I was always under the impression that the first number DOES determine the width.
It's a combination of the first and second number that determines the height of rubber above the rim (or profile).
Profile is a percentage of the width. The percentage being the second number.
So with a 245/75R16 tyre, the profile is 245x75/100=183.75mm.
Hope I got that right.
Cheers,
biggin

[Graeme]

I was always under the impression that the first number DOES determine the width.
Its the section width (measured at the buldge across the sidewalls) on a nominated rim width, eg a nominal 245mm on a 7" wide rim which is not necessarily the same on a 6" or 7.5" rim although often not much different.

[Bushwanderer]

Hi biggin,
You are quite correct.

The first value does indicate the nominal tread width, while the 2nd the tyre sidewall as a %. However, the actual values vary from manufacturer to manufacturer (and even between tyre models) and so is a (quite good) guide only.

Best Wishes,
Peter
PS: It looks like Graeme and my understanding is slightly different.

[doddsy]

Just a side note really, but i have been searching for Cooper LZT at a decent price here in Aus, the cheapest place I have found is Tempe Tyres. $325 a piece.

I think thats pretty good.

[TerryO]

That looks like a pretty good price I must agree.

Thanks for that...

cheers,
Terry

[~Rich~]

WOW! $325 each.
I shopped around 2 yrs ago and the best price I could find was $387, 6mths ago it was $445!
Yes the Aus $ is a lot stronger than what it was, but I can't believe that much!

[kero]

Does anybody know if 275/65/18 st coopers or 285/60/18 LTZ will fit D4 with the new 18 inch rims.

Thanks. KERO

[Redback]

Hey Baz,
I was always under the impression that the first number DOES determine the width.
It's a combination of the first and second number that determines the height of rubber above the rim (or profile).
Profile is a percentage of the width. The percentage being the second number.
So with a 245/75R16 tyre, the profile is 245x75/100=183.75mm.
Hope I got that right.
Cheers,
biggin

But looking at this

As a comparison: Sidewall (mm) Radius (mm) Diff (%)
Standard 235/70-17 164 380 0.0
Mine 265/70-17 186 401 5.5
Yours
(LTZ) 275/65-18 179 407 7.1

Above says that the 265 is wider:confused:

Baz.

[Redback]

Does anybody know if 275/65/18 st coopers or 285/60/18 LTZ will fit D4 with the new 18 inch rims.

Thanks. KERO

275/60/18 fit the 2010 RRS, GGhaggis has the 275/60/18s on his, so 275 /65/18 should fit a D4, 1/2 inch diff in Height.

Baz.

[~Rich~]

Use this website to compare tyre sizes:
Tyre Size Calculator @ ExplorOz Articles (http://www.exploroz.com/Vehicle/Tyres/SizeCalc.aspx)

[biggin]

But looking at this

As a comparison: Sidewall (mm) Radius (mm) Diff (%)
Standard 235/70-17 164 380 0.0
Mine 265/70-17 186 401 5.5
Yours
(LTZ) 275/65-18 179 407 7.1

Above says that the 265 is wider:confused:

Baz.

The 265/70-18 is higher (more diameter) not wider. 265 is the width.

[Bushwanderer]

Hi redback,
Again, biggin is right.

Perhaps the "table" would have been clearer if I'd used the heading "sidewall height (mm)".

Best Wishes,
Peter

[dominicbeirne]

Evening all,

Just another question sort of on topic and if not apologies all round. have been quoted General Grabber AT2 255/60 18 @ $385 each all done in Brisbane. As this is my first tyre replacement on my 09 Petrol SE @ 43000 km, is this a good price and what advice can anyone give on these tyres? 90% - 95% of driving is on tarmac but some beach and paddock bashing happens as well.

Help thanks

Cheers

Dom:confused: