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Old 08-26-2016, 04:00 PM   #1
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Add-on for rear bumper and bike rack plus spare tire holder



before mounting and painting.




mount will pivot for spare tire removal.
1/4 inch plate is welded inside of square tube for bolts.
everything is bolted using 1/2 inch grade 5 hardware.


rear bumper is factory and made with zero dot 108 steel..
square tubing is zero dot 084 steel
.
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Old 08-26-2016, 07:30 PM   #2
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Quote:
Originally Posted by Chuck_Hammer View Post


before mounting and painting.




mount will pivot for spare tire removal.
1/4 inch plate is welded inside of square tube for bolts.
everything is bolted using 1/2 inch grade 5 hardware.


rear bumper is factory and made with zero dot 108 steel..
square tubing is zero dot 084 steel
.
Very nice!! That aught to hold up for along time.
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Old 08-27-2016, 08:28 PM   #3
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I'm confused. That custom subframe is mounted to the TT on a pivot in front of the spare. But the subframe appears to be u-bolted to the factory 4" bumper.

And the 2" receiver is also u-bolted to the factory 4".

So really the subframe is adding great tensile strength, essentially preventing the factory from being able to be ripped backwards.

The subframe does not appear to provide the factory bumper any additional "downward" force resistance.

I can see the Ubolted subframe could add some torsional strengthening to the factory, but not much, right?

Because as the receiver mounted bike rack applies a moment, the bumper will want to twist, and the sub frame, because it is only hung from the factory in the rear, will only slightly stiffen the bumper.

Not being critical, just being curious.

Thanks
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Old 08-28-2016, 06:49 AM   #4
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square tube is less likely to bend .

and the added weight (47 pound tire ) reduces the twist of 4 inch bumper.
( counter balancing )
tire is 47, sub-frame 22,, bike rack 49, 2 bikes 53.
second bike is 34 inches from bumper... sub-frame is 50 inches.

and YES it does greatly reduce the bounce of the bike rack.

and the bounce is what will rip the bumper off of the frame.

and the tire/wheel does not make contact with the sub-floor.

my opinion..

and this setup has been designed by a mechanical engineer. (not me)
and was calculated (whatever they call it) by the software he uses at work.

Ed calls it a movement dampener.. and the tire/wheel is KEY to it.
as well as a spare tire mount

. Thank You for asking.
.
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