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  #10  
Old 15-04-2016
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Try some MORryde heavy duty hinges.....you'll find them by google...most of the Jeep parts sellers list them.....greasable HD steel hinges to carry the load of the bigger tyre.
Quite a bit cheaper than a carrier, if you don't need the carrier/bumper combo....

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  #11  
Old 27-04-2016
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Hi NTRubicon

Im trying to work out the best tyre size too and this is great info cheers.

Good to know there's no rubbing until you disconnect the sway bar on a 285/70

Just want to know what motor/tranny you have? 3.8 or 3.6, did the bigger tyres make it much more sluggish?

Cheers

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  #12  
Old 27-04-2016
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Quote:
Originally Posted by bretto88 View Post
Hi NTRubicon

Im trying to work out the best tyre size too and this is great info cheers.

Good to know there's no rubbing until you disconnect the sway bar on a 285/70

Just want to know what motor/tranny you have? 3.8 or 3.6, did the bigger tyres make it much more sluggish
I've got a 3.6 rubicon unlimited with 4.1:1 gearing as standard, and the bottom end torque is a 'little' more sluggish on the road, but off-road it's just right.

The sport model gearing is 3.73 which is a little worse for performance but it's a manageable loss at the bottom end for a slightly better cruising revs. My friend has the sport model shorty and his downhill low range is already too fast for his preference, so when he upgrades to 285 he plans to install 4,56 gears and a rear locker.

Fuel consumption overall is 0.6-1.1L/100km worse with the tyres but I am doing a LOT more off-road now I have tyres with grip on them. I'll show some tread updates after doing a mountainside recovery last week (scrambling up a loose rock hill on 30% gradients with 2t of broken MQ Patrol has given me a chip or three on some tread blocks) when I can get some decent pics of the chips (minimal damage)
  #13  
Old 27-04-2016
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That makes me a bit concerned about my 3.8 on 3.21 gears... oh well

Cheers for the info again.

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  #14  
Old 28-04-2016
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Quote:
Originally Posted by bretto88 View Post
That makes me a bit concerned about my 3.8 on 3.21 gears... oh well

Cheers for the info again.

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Here's a chart to work out what's best in gearing and tyre sizes for your engine and transmission
http://www.wanderingtrail.com/Mechanical/gearratio.html
  #15  
Old 29-04-2016
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Cheers.

Might give 275/70 17s a go.

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  #16  
Old 29-04-2016
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Quote:
Originally Posted by bretto88 View Post
Cheers.

Might give 275/70 17s a go.

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I've got 265/70 on my 3.8L Manual. Apart from making the speedo a little more accurate there is no noticable difference in gearing at all.

The reason I went this way and not larger was because I often tow a camper and the last thing I needed was to loose any more power.
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  #17  
Old 01-05-2016
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Cheers good to know. I test fitted a 285 on my stock rim this weekend and didn't see any signs of rubbing on full lock. Didn't drive around though

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  #18  
Old 16-10-2016
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Default UPDATE: 10,000km and 2 rotations into it

ITs been a while since I updated this, but thought to provide some more info on how these tyres are going. Over 10,000km on them now (closer to 12k) and have recently done the second rotation to bring the new spare in.

Treads are wearing quite well considering the treatment they've had, the tyre installers commented on how evenly they are wearing and that there is an expected amount of 'feathering' occurring to every second lug - which is something to do with measuring the evenness of the wear on each side of the tyre and helps them find flat spots - they were running their hands over them with their eyes closed I thought I needed to put on some Barry White and leave the shed while this was happening.

Chips and nicks as expected for rocks, gravel, and everything in between. They have been bounced over 100km of the Finke Desert Race track, pushed through untouched bush, climbed 40% gradients, side bitten rock walls, speeds over 140kph and operated at pressures from 15-35psi.




I've not found a way to stop them from gripping as yet - they have bitten into every surface I can push them into. I tried to get bogged in a dry river bed and had to chain the Jeep to a tree to get it to dig down to the belly. After detaching the chain they just dug their way back out to the surface. Didn't even need to drop pressures.

The 4wdTV guys came to Alice a few weeks back and I was able to lead them out on a local track for a couple of hours. All vehicles but one were on the same tyres and everyone made it through every obstacle I could throw at them. That Iveco Daily thing is a weapon, and I'd love to have one in the stable.


The next big test will come in the next week - a s^&* ton of sand driving. We are going out in a big group to drive through Boggy Hole, Running Waters and out via Ernest Giles Road. Highway for 100km, sand and rock for 6-7 hours, dirt for 80km, then highway for 100km and home.

I still haven't figured out uploading video yet, but when I do you'll be the first to see them.
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