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  #1  
Old 10-15-2014, 06:40 PM
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Roof Rack Strength

Hi,

I was thinking of adding a roof rack to carry surf skis and a kayak but looking at the sticker on the windows it seems to imply you cant carry anything with that much wind resistance on the roof (?) Also the local roof rack people in Adelaide hinted that the fixings on the GC are not that strong and you have to be careful what you put up there....

This has made me a bit nervous - whats the real story, are the roof rail fixings that the racks attach to decent and properly secured or not ?

thanks !

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Old 10-15-2014, 07:32 PM
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Re: Roof Rack Strength

The problem is where the rails attach to the roof is quite weak, so if you push down on the rails with any force you will see it deforms quite easily.

Some roof racks move or disperse the mounting point weight to the pinch weld where the roof is stronger. Gobi do a rack like this, and uneek are about to release theirs.

WK2 Grand Cherokee roof rack

edit: I wouldn't have any problem sticking a short kayak or surf board up there, but 4m+ boards could put a bit of pressure on the roof at speed.....
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Old 10-16-2014, 06:04 AM
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Re: Roof Rack Strength

OK thanks, wil probably be ok then for what I need.
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Old 10-16-2014, 07:44 AM
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Re: Roof Rack Strength

Quote:
Originally Posted by Benn0 View Post
The problem is where the rails attach to the roof is quite weak, so if you push down on the rails with any force you will see it deforms quite easily.

Some roof racks move or disperse the mounting point weight to the pinch weld where the roof is stronger. Gobi do a rack like this, and uneek are about to release theirs.

WK2 Grand Cherokee roof rack

edit: I wouldn't have any problem sticking a short kayak or surf board up there, but 4m+ boards could put a bit of pressure on the roof at speed.....
Benno.

It think you may like to take the roof bars off and have a look.

The roof is not weak and you will probably be surprised by what is under the rail.

How do I know?

Well the garage door apparently has a habit of closing itself and apparently did so one day on the roof of the GC whilst I was at work!!

Rola roof Bars were on at the time and are now retired (ended up replacing the foot pack on my previous set of thule bars). One roof rail rail was bent and the roof skin needed a little persuasion to pop back up. Other than that all fine. All four mounting bolts were bent, and one foot was broken. No broken paint and nothing other than cosmetic stuff to fix.

Suffice to say if the roof bars can be pretty much moved and bolts bent, rail bent and the garage door bent etc within minimal damage to the roof, they are not weak IMHO.

Regards

Adrian.
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Old 10-16-2014, 08:17 PM
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Re: Roof Rack Strength

But it is still only rated to 68kg, that is weak. And the fact that I can cause the roof to deform with one hand on the rail, that is weak.

While a single impact of say ~50kg wasn't enough to damage it, sustained driving over bumps and through turns with 100kg of downforce likely is. Not in the first few minutes of driving, but over time you are likely to do damage.

Large boats, kayaks, etc aren't particularly heavy, but they are going to catch the wind on the highway, increasing the down force on the roof at speed. I was thinking of using kayak holders to put them on their side, so the impact of the wind is lessened, but for camping I will be close to 100kg static on the roof, and over rough tracks, the roof won't take that with the standard rails.
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Old 10-16-2014, 08:58 PM
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Re: Roof Rack Strength

Oh, here is the video that put me off using the original roof rails for holding a decent load:



Posted by Wanderer on the AJOR forum
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Old 10-16-2014, 11:20 PM
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Re: Roof Rack Strength

Thanks for your various posts.

What I dont understand is why the mounting points aren't attached to the steel frame where there should be no flex and ample strength ??? This just seems stupid - what am I missing ?
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Old 10-16-2014, 11:36 PM
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Re: Roof Rack Strength

The 150lb/68kg limit goes back to the WJ, I guess the engineers were given a number and they just built what would meet the spec. It is pretty ordinary. I'm ordering a uneek rack.
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Old 10-17-2014, 02:24 AM
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Re: Roof Rack Strength

The uneek rack looks hot. Just wish it was $500 cheaper.
$1600 is a bit pricey.
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Old 10-17-2014, 02:31 AM
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Re: Roof Rack Strength

$1800 even... I think for that price I'd prefer to get a murchison lift and some heavy duty rlcp rhino racks!
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Old 10-17-2014, 02:40 AM
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Re: Roof Rack Strength

I'm using the rhino rack mounts and crossbars with a roof top tent and awning on top. So far no problems with it, with the tent on top and mounted to the bars gives also more stability, so the rails don't move anymore like in the video.
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Old 10-17-2014, 02:55 AM
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Re: Roof Rack Strength

Quote:
Originally Posted by snwbrdr View Post
I'm using the rhino rack mounts and crossbars with a roof top tent and awning on top. So far no problems with it, with the tent on top and mounted to the bars gives also more stability, so the rails don't move anymore like in the video.

Would love to see some pics mate.
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