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  #10  
Old 03-04-2013
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Originally Posted by LeCheese View Post
bmackin - I was under the impression that all export WK2s came with HD brakes (the bigger ones), and it was only the US where the trim level determined the brake size. I'm happy to be proven wrong, but that's what I've heard
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Originally Posted by Nicholas View Post
Iva also heard this is correct all our WK2,s have HD brakes.
Yes you both may be right. I know the Off-Road packages get the HD brakes and the larger engines (5.7L Petrol & 3.0L CRD) but I wasn't sure about the base model Laredo with the 3.6L Petrol. Maybe they all do now, it would certainly make things a lot easier.
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Old 03-04-2013
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Originally Posted by Trailhawk View Post
Yeah, thanks. I checked the Trailhawk when i visited it at the dealer and it has the vented rear rotors which i think someone said was an indicator of the HD larger brakes. My Dad has the Bighorns on his Disco-3 and they seem pretty good. They are priced pretty well too. Do you know when the 275/70-18's scrubbed, was it only on access mode? I would only use them for off road and the trek to and from.
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Originally Posted by Trailhawk View Post
The Nitto Trail Grappler is available in 285/65-18 which gives a total height of 32.8", they suit a 8" rim and are 11.9" wide. These are ment to be a fantastic mud tyre. Maybe spacers will be required?

The Maxis 275/65-18 height is 32.1" and are 11" wide.
I haven't tried 275/70R18s, but at 33.2" tall I'm pretty sure they wouldn't fit. Beyond the various height settings you also need to account for full lock-to-lock turning, full axle articulation and full suspension compression.

286/65r18s are 32.6" tall and 11.2" wide, while the 275/65R18s are actually only 10.8" wide. The width makes a big difference on the WK2s, since the upper control arm knuckle is a limiting factor. I've got about 5mm between the tire and the upper control arm knuckle, so anything much wider would hit the knuckle.

With my 275/65R18s I have about 15mm of space between the tire and the wheel well when at full turn in aero mode. Not much room at all. When you account for axle articulation (the wheel being pushed up into the wheel well) and bump stop compression (another 10-15mm), I'd say 265/75R18s are the maximum size you can go safely without alterations. Also, with the front air dam removed, the wheel well pushes back towards the tire 5-10mm when at highway speeds.

There is a pretty long thread over at Jeep Forum about all the various options if you feel like doing a bit of reading on the topic, (http://www.jeepforum.com/forum/f309/...sizes-1158755/). They discuss the various tire sizes, wheel sizes, tire and wheel combos, brands, offset, fitting a larger tire in the spare tire carrier area and a whole lot of other stuff.

I hope that helps.
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Last edited by bmackin; 03-04-2013 at 04:12 PM.
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  #12  
Old 03-04-2013
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Great reply Bmackin, very helpful. My idea is to just using the mud tyres for off road so aero mode may not be of a concern, I will check out the thread you linked, wheel spacers may also sort out the control arm clearance issues again just for off road.
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Old 03-04-2013
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My 275/65/r18 hankook dynapro rf10 tyres on standard rims just touch on the anti roll bar at full lock and I have a 2.5 inch lift. Do not go bigger without different offset or wheel spacers or they will be touching especially off road.
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Old 04-04-2013
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Quote:
Originally Posted by Trailhawk View Post
Great reply Bmackin, very helpful. My idea is to just using the mud tyres for off road so aero mode may not be of a concern, I will check out the thread you linked, wheel spacers may also sort out the control arm clearance issues again just for off road.
Glad I can help Trailhawk.

Be careful, because you will still need to drive to your off-road adventure and any speeds over about 100kmh will automatically put you into aero mode.

Of course you could get together with Numb Thumbs and purchase the LLAMS (air suspension override system) he's been testing. It allows you more control over the air suspension.

Personally I'd still be careful going larger than 275/65R18s due to the axle articulation and bump stop compression issues I mentioned.

What I'd really love to see, is Jeep release the Trailhawk 2 modified fenders so we could all bolt 35" tires onto our WK2s!
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Old 04-04-2013
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Have you considered the Wrangler Overland rims?
If they clear the callipers there offset/back spacing is more shallow moving the rim away from the suspension and may provide you with the clearance you need for the bigger tyres.
Not the best looking rims (I would paint them black) but 18 inch and hub centric.
http://www.ebay.com.au/itm/170989484...84.m1423.l2649
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