Roofbar Holes

Technical questions and answers about the Mazda Bongo

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thedogsbollox
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Roofbar Holes

Post by thedogsbollox » Tue Jun 02, 2009 12:35 am

OK so i am planning on making a rack to carry my Kite buggys on the back of the Bongo.
Now i need some way of attaching them at the top, i can make a bracket to fit to the towbar to carry them easy enough and i think i could make up some sort of strapping to hold the top that attaches to the roofbar holes.
The question i have is this, How deep are the holes?, what thread are they? and whaat wheight would you think it would sustain under heavy braking? There would be no downward stresses on them only forward stress under braking
I have 2 buggys that would weigh probably 80kgs in total. I suspect that people have roofbars with boxes that contain similar weights, your thoughts please
Tony
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apole
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Re: Roofbar Holes

Post by apole » Tue Jun 02, 2009 10:45 am

Hi,

The threadsize for the holes in the ATF roof for roofbars is M8. I would say they go no more than 10mm.

Not sure on how much load you can put on them, and remember too it would be designed more for downward loading than sideways, not sure if that makes a difference.

Hopefully someone else knows more.

Andy
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stilldesperate
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Re: Roofbar Holes

Post by stilldesperate » Tue Jun 02, 2009 11:45 am

I think I saw 75kg as a max roof loading, I expect you would need to remove the weight before raising the AFT.

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madmile
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Re: Roofbar Holes

Post by madmile » Tue Jun 02, 2009 11:11 pm

Hi Tony
I am sure they would take the strain no problem.
Obvioulsy the tow bar rack will take the load, but you just want to stop the pivoting movement of the front wheel under acceleration /braking.
You could mount an outrigger type bar over the rear, but its likely to cause problems when you lift the roof.
Why not use the rear mirror, or even use the fixings to mount something.
We have tied the front wheels of a libre and flexi to the mirror for the past year, with no problems at all.
Cheers
Ed
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dandywarhol
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Re: Roofbar Holes

Post by dandywarhol » Tue Jun 02, 2009 11:30 pm

They're a bit more than 10 mm long and they're also threaded into an insert from UNDERNEATH so no chance of them pulling out. They're used to remove the AFT which itself weight 65kg
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thedogsbollox
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Re: Roofbar Holes

Post by thedogsbollox » Wed Jun 03, 2009 12:54 am

Excellent response guys. I feel much more confident now.
@Madmile I used to carry a RS Speed buggy and a RS Standard on a bike rack and did tie them to the mirror, Now i need to carry a Cougar and a Standard RS so will not be confident in the strength of the mirror bracket and the fact that it is not directly centered.
I was thinking of using 20 to 25mm wide and 2 or 3mm thick lengths of flat bar. Attached to each of the mounting points and the other ends meeting at a point just past the rear spoiler. May need a fifth one going between the rear points to hold up the front ones.
Wish me luck
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