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Naff Profile
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Date Registered: 09-2005
Location: QLD
TOTAL POSTS: 786
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Re: Tyre Carrier


Great idea!

First thing that comes to mind... (and this really only applies to very few people or if you were to market the idea) if you were touring you might like to tow a camper trailer and you'd most certainly want your spare(s). So you might be back at square one.

Second, do you think you would need to get the idea engineered in regards to the loading?

Finally, (i'm sure there would be a way) but you would want to ensure there was no forward travel of the carrier with that load - i.e. sharp braking might cause a shift in load and you might end up with a broken window.

Otherwise - that's a great idea and it wouldn't be limited to the Exy.



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8/Sep/2008, 5:31 pm Link to this post Send Email PM   Send Private Message MSN
 
amts Profile
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Date Registered: 08-2008
Location: Adelaide
TOTAL POSTS: 24
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Re: Tyre Carrier


quote:

Naff wrote:
First thing that comes to mind... (and this really only applies to very few people or if you were to market the idea) if you were touring you might like to tow a camper trailer and you'd most certainly want your spare(s). So you might be back at square one.



I guess those that were towing would have spare wheel carriers on the A-frame of whatever they are towing or on the sides of the campers.

quote:

Second, do you think you would need to get the idea engineered in regards to the loading?



I'm a mechanical engineer. Is that enough? emoticon

quote:

Finally, (i'm sure there would be a way) but you would want to ensure there was no forward travel of the carrier with that load - i.e. sharp braking might cause a shift in load and you might end up with a broken window.



The pivoting point of the frame is on the lower hole. The hole directly on top takes another hitch pin to lock the frame in the upright position. So in the event of a crash, everything should not move given enough material thickness and correct material selection.

I have not done any loading calcs but have gone with general rule of thumb. As I don't have weights of tyres, it would be hard to start a calc.

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8/Sep/2008, 5:38 pm Link to this post Send Email PM   Send Private Message
 
waky53 Profile
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Date Registered: 06-2005
Location: Barossa Valley
TOTAL POSTS: 286
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Re: Tyre Carrier


Andrew, on my towbar hitch, the tightening bolt is on the underside of the hitch.
It took me months before I found it.

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8/Sep/2008, 7:55 pm Link to this post Send Email PM   Send Private Message
 
amts Profile
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Date Registered: 08-2008
Location: Adelaide
TOTAL POSTS: 24
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Re: Tyre Carrier


quote:

waky53 wrote:

Andrew, on my towbar hitch, the tightening bolt is on the underside of the hitch.


Do you have a pic of it? Is it underneath on the flat part or on the corner so the bolt goes in at 45deg?

I think I might be able to come up with a tyre carrier with integrated towball. More to come tomorrow. The problem is designing it so that it can still pivot down to allow access to the boot.

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Andrew
8/Sep/2008, 10:36 pm Link to this post Send Email PM   Send Private Message
 
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Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 5977
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Re: Tyre Carrier


quote:

amts wrote:
I think I might be able to come up with a tyre carrier with integrated towball. More to come tomorrow. The problem is designing it so that it can still pivot down to allow access to the boot.



Remember though, the allowed towball weight of whatever you tow will be REDUCED by whatever the weight of the spare is emoticon

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8/Sep/2008, 11:08 pm Link to this post Send Email PM   Send Private Message Blog
 
amts Profile
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Date Registered: 08-2008
Location: Adelaide
TOTAL POSTS: 24
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Re: Tyre Carrier


If anyone can supply the weight of an Exy's wheel and tyre ( I assume that worst case scenario would be 225/70R16 BFG's), then this could determine how much is left for towing given that the T30 only has a towball weight of 150kg.

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Andrew
8/Sep/2008, 11:31 pm Link to this post Send Email PM   Send Private Message
 
Naff Profile
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Date Registered: 09-2005
Location: QLD
TOTAL POSTS: 786
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Re: Tyre Carrier


Hehehe yup, somewhere I think it says that if you are an engineer you can certify things emoticon

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9/Sep/2008, 11:46 am Link to this post Send Email PM   Send Private Message MSN
 
amts Profile
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Date Registered: 08-2008
Location: Adelaide
TOTAL POSTS: 24
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Re: Tyre Carrier


Here is Mk II incorporating a towball
Image

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Andrew
9/Sep/2008, 11:46 am Link to this post Send Email PM   Send Private Message
 
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Date Registered: 09-2008
Location: Nathalia, Victoria, Aus
TOTAL POSTS: 137
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Re: Tyre Carrier


Nice work Andrew!!!!
I'm also hunting for an Exy and i wanted larger tyres for a bit of lift. But as i read in other threads the spare tyre can not go any bigger. I was thinking of the same thing as yourself and taking the spare out for extra storage.
Maybe one designed with a work light and or even and extra 12 volt plug.
Cheers
Adrian

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14/Sep/2008, 1:18 pm Link to this post Send Email PM   Send Private Message
 
amts Profile
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Date Registered: 08-2008
Location: Adelaide
TOTAL POSTS: 24
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Re: Tyre Carrier


quote:

XCHUNK wrote:
But as i read in other threads the spare tyre can not go any bigger.


I thought I read somewhere that a BFG 225/70R16 is a snug fit in the spare tyre well, only just. I could be wrong though.

I think the Mk II design with the integrated towball will require some certification. To use the tow hitch just to carry spare tyres and jerry cans should be fine but if you start modifying the tow bar and add a tyre carrier and something happens, I'm pretty sure the insurance company is going to reject the claim without certification.

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Andrew
14/Sep/2008, 6:13 pm Link to this post Send Email PM   Send Private Message
 


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