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  #565  
Old 01-22-2016, 02:56 AM
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Quote:
Originally Posted by GC Blue Mountains View Post
Hi all,
Will be picking up new Overland with Adventure Group next week. Comes standard with Kuhmo KL21 tyres and I am wanting to change to AT tyres like Goodyear Wrangler Adventure. Kuhmo have a "H" speed rating and all AT tyres I can see including the Goodyears only have a "T" speed rating. Tyre guys have advised me to check with insurance Company to see if this lesser speed rating would effect insurance claims. Anyone else experienced this? ps this is is NSW.
Allan
I got the tyres changed to Cooper AT3s before I picked up the GC. The tyre shop local to the dealer swapped them for only $150 each. Would have cost a lot more if I picked up the car and took it to a tyre shop and got stuck with the old set.

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  #566  
Old 01-22-2016, 08:56 PM
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Re: Off Road 18"s

Quote:
Originally Posted by GC Blue Mountains View Post
Hi all,
Will be picking up new Overland with Adventure Group next week. Comes standard with Kuhmo KL21 tyres and I am wanting to change to AT tyres like Goodyear Wrangler Adventure. Kuhmo have a "H" speed rating and all AT tyres I can see including the Goodyears only have a "T" speed rating. Tyre guys have advised me to check with insurance Company to see if this lesser speed rating would effect insurance claims. Anyone else experienced this? ps this is is NSW.
Allan
It's not a matter of what the Kumho's are but what is stated on your compliance plate. The Kumho's would of course be compliant. If you have the Adventure Group I'm guessing your compliance plate will state 265/60R18 110H. Unless you have tyres that exactly comply with that, you have a potential conflict with your insurance company and maybe even the law. However, for those of us that require a tough off-road tyre like an LT tyre, this is a risk we are prepared to take. A search of Tirerack.com shows that the only complying A/T tyres are the Yokohama Geolander A/T-S and the Pirelli Scorpion ATR. I'm sure you will be happy with either of those.
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  #567  
Old 01-22-2016, 09:11 PM
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Re: Off Road 18"s

VSB14 - NATIONAL CODE OF PRACTICE for LIGHT VEHICLE CONSTRUCTION and MODIFICATION - SECTION LS

TYRES, RIMS, SUSPENSION AND STEERING

VERSION 2.1 NOVEMBER 2015

4.1 REPLACEMENT TYRES ON STANDARD (OR MANUFACTURER’S OPTIONAL) RIMS

A motor vehicle under 4.5 tonnes GVM which is required to comply with ADR 24 may be equipped with tyres other than those listed on the tyre placard provided that:

- the load rating of the tyres is not less than the lowest load rating listed on the tyre placard of the vehicle or equivalent variant of that model vehicle;

- the speed rating of the tyres fitted to a passenger vehicle is at least 180 km/h (S) when the tyre placard requires a higher speed rating than S;

- the speed rating of the tyres fitted to vehicles with special features for off-road use of at least 140 km/h N when the tyre placard requires a higher speed rating than N; and

- for all other vehicles a speed rating of at least 120 km/h.

- In special circumstances, the speed rating may be less than the ratings specified above if the speed rating of the tyre is more than the vehicle’s maximum speed. This will need to be confirmed with the Registration Authority.

4.2.4 Overall Nominal Diameter
The overall diameter of any tyre fitted to a passenger car or passenger car derivative must not be more than 15mm larger or 26mm smaller than that of any tyre designated by the vehicle manufacturer for that model.

The overall diameter of any tyre fitted to:
- 4WD passenger vehicles specifically designed for off-road use (typically MC ADR category). All wheel drive (AWD) vehicles including those AWD vehicles that may be certified as MC ADR category, (also commonly known as soft roaders) are not included in this category;
- 4WD goods vehicles and their 2WD equivalents if the chassis and running gear are essentially the same as the 4WD version (N ADR category); or
- any medium weight goods vehicle (NA2, NB ADR category).
Must not be more than 50mm larger or 26mm smaller than that of any tyre designated by the vehicle manufacturer for that vehicle.

Note: Increases in tyre diameter are subject to compliance with all other requirements specified under this clause (Clause 4.2 Non-Standard Tyres and Rims) and may therefore be limited by other factors such as insufficient clearance.

Speedometer accuracy must be maintained for the selected tyre and rim combination to within the degree of accuracy specified in ADR 18 where applicable. It is suggested that the degree of accuracy is in accordance with the most recent version of ADR18.

4.2.5 Tyre Aspect Ratio
Because of the different handling characteristics, the aspect ratio of tyres fitted to the front axle must not vary by more than 10 from the aspect ratio of tyres fitted to the rear axle (e.g. 175 65R14 front and 205 45 R14 rear, has an aspect ratio difference of 20 and is not recommended, whereas 175 65 R14 front and 195 60 R14 rear has a difference of 5 and has similar handling characteristics).

https://infrastructure.gov.au/roads/...ov_2015_v4.pdf

Cheers
Steve
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  #568  
Old 01-22-2016, 10:44 PM
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Re: Off Road 18"s

Well looks like I'm buggered.
My Wilpeaks have a speed rating of Q (160km/h).
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  #569  
Old 01-22-2016, 10:49 PM
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Re: Off Road 18"s

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Originally Posted by Barboots View Post
- the speed rating of the tyres fitted to vehicles with special features for off-road use of at least 140 km/h N when the tyre placard requires a higher speed rating than N; and

Isn't this the applicable section?
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  #570  
Old 01-22-2016, 10:56 PM
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Re: Off Road 18"s

Yes mate. I posted the whole subsection for interest, but that's the key portion. It's actually worth reading the whole PDF, as the permissible rolling diameter increase is linked to suspension lift. Not that I think an excess of 50mm of wheel/tyre and suspension is common, but it's good to understand especially to guide others.

Noons, your date is safe fella
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  #571  
Old 01-22-2016, 11:02 PM
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Re: Off Road 18"s

Quote:
Originally Posted by Barboots View Post
Noons, your date is safe fella
Steve, you can clearly see my comprehension skills haven't improved since grade 2!
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  #572  
Old 01-23-2016, 10:37 PM
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Re: Off Road 18"s

At the last Jeep Jambo I attended, the Lithgow police had a field day checking out the tyres of any one that looked like potential attendee heading up the highway to the Jambo site.
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  #573  
Old 01-23-2016, 10:41 PM
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Re: Off Road 18"s

Yeah a convoy of 37"s can bring that about.

Don't scare the kids. Oversizing within the guidelines is not a legal issue. As with any change to your car, it's best practice to notify your insurer... including details of compliance.
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  #574  
Old 01-30-2016, 06:30 AM
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Re: Off Road 18"s

Quote:
Originally Posted by Bigskiddy View Post
Pretty happy with the Dynapros, they look the part at least!
Any updates?

I might be in the market for a set of these very shortly.
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  #575  
Old 01-31-2016, 04:03 AM
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Re: Off Road 18"s

Go a set of Bridgies SD... I love them.


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  #576  
Old 01-31-2016, 08:19 PM
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Re: Off Road 18"s

Quote:
Originally Posted by SnakeDoctor View Post
Any updates?

I might be in the market for a set of these very shortly.
Dynapro MT

Not really, used them recently in some clay mud bog holes and I didn't get stuck.

Only problem was the rear driver's side made contact with the rear wheel arch (3 o'clock area) and did a little damage to tyre edge. Strangely it has happened whilst on road. Thinking it might have happened when I stopped and then accelerated. (Mine are 275/65/R18)
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