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  #25  
Old 03-18-2014, 10:07 AM
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Quote:
Originally Posted by Setoutguy View Post
The difference in width between a 50 series and 60 series tires...
Ummm... what?

Steve
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  #26  
Old 03-18-2014, 04:38 PM
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Re: Advantage of 20" rims over 18"?

ummmm...... The profile (aspect ratio or sidewall height) 45,50,60 etc., is a percentage of the width 245/50/20 is 245mm wide, 122.5mm high and fits a 20" rim. The profile varies with the width, so a 285/45/20 has a different rolling diameter to a 245/45/20. Changing profiles will affect the speedo reading and final drive ratio, which could affect fuel economy.

Now back OT, the 18" rim is better for offroading as there is a larger selection of off road tyre choice and they will have a much larger sidewall. This gives some cushioning to the tyre when used in offroad conditions, being it sand, mud, snow or lava

I do not know how we got onto rally cars and narrow tyres, but they use narrow tyres to cut through the slush to get to the base material for traction.
This applies to mud and snow in general, so unless you are a serious offroader, living on a mountain or swamp, it really does not apply to a 2.5t 4x4.
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  #27  
Old 03-18-2014, 06:04 PM
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Quote:
Originally Posted by ENFORCER View Post
ummmm...... The profile (aspect ratio or sidewall height) 45,50,60 etc., is a percentage of the width 245/50/20 is 245mm wide, 122.5mm high and fits a 20" rim. The profile varies with the width, so a 285/45/20 has a different rolling diameter to a 245/45/20. Changing profiles will affect the speedo reading and final drive ratio, which could affect fuel economy.

Now back OT, the 18" rim is better for offroading as there is a larger selection of off road tyre choice and they will have a much larger sidewall. This gives some cushioning to the tyre when used in offroad conditions, being it sand, mud, snow or lava

I do not know how we got onto rally cars and narrow tyres, but they use narrow tyres to cut through the slush to get to the base material for traction.
This applies to mud and snow in general, so unless you are a serious offroader, living on a mountain or swamp, it really does not apply to a 2.5t 4x4.
The ummmm part because he said the width difference between aspect ratios, the width would stay the same.
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  #28  
Old 03-18-2014, 06:23 PM
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Quote:
Originally Posted by loveracing1988 View Post
The ummmm part because he said the width difference between aspect ratios, the width would stay the same.
Points for reading accuracy loveracing1988 :thumbup:

Enforcer, surely you have noticed that I understand tyres a little better than needing a run down on sizing basics? The width of a tyre (sectional) is what's written on it... irrespective of the profile.

For the original poster, I believe that two sets of rims are worth considering if you are going into true "hard country", but not so regularly. A good strong tyre will change the vehicle's ride around town and you may not want that week to week. Yesterday I removed my load range E LT 18"s yesterday and refitted the Overland 20"s. It doesn't take long and provides the true best of both worlds. Cost about two grand including TPMS to have the choice of what shoes I wear. That said it all depends on where you're likely to be going, and I don't think that's been detailed yet.

Cheers,
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  #29  
Old 03-18-2014, 06:57 PM
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Re: Advantage of 20" rims over 18"?

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Originally Posted by Barboots View Post
For the original poster, I believe that two sets of rims are worth considering if you are going into true "hard country", but not so regularly. A good strong tyre will change the vehicle's ride around town and you may not want that week to week. Yesterday I removed my load range E LT 18"s yesterday and refitted the Overland 20"s. It doesn't take long and provides the true best of both worlds. Cost about two grand including TPMS to have the choice of what shoes I wear. That said it all depends on where you're likely to be going, and I don't think that's been detailed yet.

Cheers,
Steve
I totally agree - IF I was looking at regular "Hard" off roading then the 2 sets would be the way to go. But for the time being it will only be pretty tame "soft" off roading. Like fishing trips along the beach and bush camping trips. So mainly sand and rutted tracks maybe a hill or 2 (Not many Mountains over here).

Once I see how well the Jeep performs, I can then look at replacing all my recovery gear that was sold with a old 4x4.

At this stage I feel the extra 2 grand for the second set of wheels would be better spent other things like Tow Hitch and Bull Bar
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  #30  
Old 03-18-2014, 07:20 PM
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Mark definitely get 18"s then. Perth's northern beaches have treacherously soft sand and the 20"s would be a problem... unless you are happy to stop where the access tracks meet the beach. Oh, then there's the limestone cap-rock, which could really mess with 20"s.

There's no reason you can't negotiate a dealer rim swap plus the tyres of your choice, but I think you'd pay less overall to take the OEM 18" tyres and trade them. I know at least one tyre dealer who'll pay ~$125 a corner provided you pretty much drive straight there. I say this as the OEM 18"s are a relatively weak tyre, though they should perform well deflated provided the access tracks don't eat them up getting there.

Cheers,
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  #31  
Old 03-18-2014, 07:23 PM
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Re: Advantage of 20" rims over 18"?

Steve, my post was more a general info as many people do not understand tyres and the way they are measured.
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  #32  
Old 03-18-2014, 07:33 PM
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Re: Advantage of 20" rims over 18"?

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Originally Posted by Barboots View Post
Mark definitely get 18"s then. Perth's northern beaches have treacherously soft sand and the 20"s would be a problem... unless you are happy to stop where the access tracks meet the beach. Oh, then there's the limestone cap-rock, which could really mess with 20"s.

There's no reason you can't negotiate a dealer rim swap plus the tyres of your choice, but I think you'd pay less overall to take the OEM 18" tyres and trade them. I know at least one tyre dealer who'll pay ~$125 a corner provided you pretty much drive straight there. I say this as the OEM 18"s are a relatively weak tyre, though they should perform well deflated provided the access tracks don't eat them up getting there.

Cheers,
Steve
Thinking this will be the way to go. So will talk to the dealer when I get back to Perth and see what deal we can agree on.
The 20" Summit Rims don't seem to appeal to many people so I dont really want to try my luck selling them afterwards.

Happy to drive straight to a tyre dealer after picking the car up and get the tyres swapped out if they will give a decent trade in price or I will just use the OEM's until they need replacing
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Old 03-18-2014, 09:57 PM
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I'll buy your Summit rims
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  #34  
Old 03-19-2014, 12:38 AM
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Re: Advantage of 20" rims over 18"?

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Originally Posted by Barboots View Post
I'll buy your Summit rims
PM me if you are serious, I am away for another week, then back in town for a couple of days and the away for a month!
I will then have a couple of days back in Perth
So was going to nut it out with the dealer and finalise everything then since the car is still sitting in the States and before heading away for another 2 weeks

Personally I cant see the dealer doing me any huge favours when changing them over, and then happily charging the next person an arm and a leg for them while pretending to be doing them a huge favour

Considering he first stated there was NO cross pollination between vehicles, until I visited Wangara and they suggested that they could easily change the 20" with a set of 18" off another car if that's what I wanted!
When I told the dealer what Wangara had said then he was al "yes no problem, we can do that I want in the car you will be happy in.........."
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Old 03-19-2014, 12:50 AM
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All this just goes to show what adaptable vehicles our Grand Cherokees are. Depending upon what you need, they can be set up for anything from Soccer Moms, to Street Cruisers. Or from Hunters and outdoorsmen to serious Mudders or even Rock crawlers...Not to mention the SRT!
Ain't they great?
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  #36  
Old 03-19-2014, 10:03 PM
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Re: Advantage of 20" rims over 18"?

For what it worth, I have taken mine up into the Vic high country a couple of times now on the stock Kumho 20's. I was a little bit hesitant first time around tackling a very steep and rocky track known as Monument Track, but made it up easily, without traction issues.

A couple of weeks ago I again went into the high country and tackled a couple of tracks again. The tyres coped quite well, not showing any signs of chipping and only managed to scratch one rim (easily fixed).

If I was doing this on a regular basis I'd run some AT's on 18's, but for once in a blue moon they did well. However, I still think I'll look into a second set. I'd rather keep the 20's with decent road tyres for the road and swap to the AT's if/when I plan on going offroad.

Saw this a few weeks ago, so if anyone has bought an alloy 18 as a spare and wants to sell the steel spare, PM me.
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