Does anyone know.......

[Mark Hooton]

Does anyone know the weight the GSA rack can bear? I'm pretty sure it will be substantial and there might just be a kindly guru out there who knows!

I've designed a rack for an 'overlander' for the biggest peli box in my life (see photos) and I've spread the load over 6 anti vibration mounts, 2 on the pillion load bearing points and 4 over the OEM rack.

It can take my weight without any noticeable signs of deflection or distortion (not that I expected any) so I'm positive it can bear the specified 50kg (though it won't ever have to carry such a weight).

So, if anyone knows any specs on the rack or its fastening points it would be appreciated!

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[Deleted account 181015003]

Come clean your in training

 

[Mark Hooton]

Hahaha yup - funny - I keep falling off tho!


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[Blackal]

If you have the weight roughly over the pillion seat - then the weight of a fat pillion is do-able?

100Kg, but bear in mind that the pillion passenger may have a lower COG due to possibly having fat legs

For the pic you show - I would limit the whole Box/contents to 100kg, but load the heavy stuff as far forward/low down as poss.

Panniers is the way to go for heavy gear, though

Al

 

[Mark Hooton]

Thanks Al, much appreciated


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[Fullchat]

Don't do it Mark. Nothing is bad as it seems

 

[Mark Hooton]

Haha, you obviously haven't seen my wine bill I need to end it all and there's no better way than throwing myself off my bike


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[matchlessman]

Looks very nicely engineered, but I'd be tempted to not bother with the anti vibe mounts or use much thinner ones, to mount it all a bit lower. Weight high up is a real pain in the arse when picking it all up from a big heap on the floor. As well as the handling issues.

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[w-w]

That peli box reminds me of when I collected an Ikea sofa stool on the back of mine, possibly a little lighter.

Why bother with the dampening as they are something to break or are you looking for a stress break to be somewhere cheap.

R1200GSA TB

 

[Mark Hooton]

Yes it's a concern however the client is carrying some expensive camera gear and, of course, it's what he has specified! And yes, it'll be one hell of a mutha to pick up!


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[Mark Hooton]

And yes - I've engineered my tiny little wine soaked head off to make the best solution I can for the customer - who, I'm pleased and lucky enough to say, is over the moon with it as seemingly there wasn't anyone else who could do such a job within a short lead time.


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[crotchrocket]

would it not be best to do away with the unknown limitations of the rack and make some brackets directly onto the frame mounts? There was a snapped GSA rack on ADV rider last month.

 

[Warlord]

I don't know anything about engineering.

But that seems to be a lot of weight thrown out to the edge of the bike frame.

Static weight isn't the issue as much as a sudden force applied downwards. Like going over a heavy bump, or two or repeatedly.

There must be some mathematical calculation to show the force applied at the bike frame bolts.

I'd just worry about the weight, when gravity is assisting and the bike frame is trying to resist over heavy bumps.

 

[Mark Hooton]

Fair point and in all fairness it's easy to come up with solutions but when it comes to engineering them it's a different matter. Over engineering things as I do combined with the load being spread and absorbed over six strong location points is enough for me to be very confident in its ability to withstand what the box will be carrying. As stated by another member the rack is rated at around 100kg and that's a massive safety margin.


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[Bobbin-Man]

Is it necessary to retain the oem rack? Everything would be quite a bit lower without it.

 

[Mark Hooton]

Yes it could be and it was considered however the client (that's a bit posh - he's a biker like us) wanted to retain the rack so I had to design something around its retention. I originally wanted to mount it solely on the pillion seat plate but the box is simply too large to fit within the sides of the rack if you get what I mean.


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[Warlord]

Just a thought, when the pillion is sat on their seat their load balance is over (or fore) the rear axle. so their weight is largely inside the wheel pivot point?

If you shift all that weight to the back of the bike, its now aft of the axle. So if that bike were to be going uphill, wouldn't it get close to tipping the bike backwards (or to a dangerous level, or at least encourage the front tyre to lose traction under acceleration). It could be the perfect wheelie device, except getting all that weight back under control could be less than entertaining.

Ahh what do I know, good luck with the project, however it turns out it looks quality workmanship

 

[Deleted account 211025001]

No dissing of your engineering skills Mark and I appreciate you have made what you were asked to make but................fecking hell..........there is no way I'd consider riding a bike, let alone one as heavy as a GSA with 50kg mounted up that high.

You describe your customer as an 'overlander'......in my book that means taking the bike off road...............you have to be kidding don't you?

Andres

 

[Mark Hooton]

No, I'm not kidding fella however I'm kinda thinking he may intend to spread that load over the two panniers too. It would make much more sense and I'm sure that when he gets round to loading he will see that and pack accordingly putting the heavy stuff in the bottom of the panniers.


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[Warlord]

You know what blokes are like. If its there, they'll fill it.

Time for an Indemnity Clause I think