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Old 04-19-2015, 07:08 PM   #1
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bumper question

not sure where to put this, but is the back bumper on a school bus strong enough to support a rack holding 1000 pounds bolted to it or should I bolt the brackets to teh bolts that hold bumper?
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Old 04-19-2015, 08:08 PM   #2
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Originally Posted by Kubla View Post
not sure where to put this, but is the back bumper on a school bus strong enough to support a rack holding 1000 pounds bolted to it or should I bolt the brackets to teh bolts that hold bumper?
In short yes, but more info would be good.

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Old 04-19-2015, 08:18 PM   #3
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Bumper is 3/16 or 1/4 formed steel, limiting factor would be the bolts shearing on the frame side where it's bolted, due to vibration or impact from bouncing

If mounts can move up or down, due to loose/clearance holes for bolts or rust between mounts (crumbling out, causing loose bolts) they can shear bolts like a pair of scissors

What is application?

Mounting hardware and mounts themselves would be the limit, I think
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Old 04-19-2015, 08:19 PM   #4
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If you bolt anything to the bumper, the 2 feet of leverage on frame bolts is were issues would arise
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Old 04-19-2015, 09:39 PM   #5
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want to put a motorcycle carrier on the back
also need to eventually put a trailer hitch on it
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Old 04-19-2015, 10:22 PM   #6
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Ideally you would bolt anything directly to the frame with grade 8 bolts and washers.
School bus bumpers are supposedly designed to be strong enought to lift the bus. This is for if it ever needs to be towed.
So yeah, it could probably take 1000 lbs. the issue is that it was built to take impacts and vertical force. It was not designed to have a "twisting" force or pulling force like a rack would put on it.
It probably would work... The issue I think would be it sagging and twisting over time and eventually failing.
I saw a picture a while ago of someone who bolted a pintle hitch on to it without modifications. The bumper pulled out as it was not designed to take force in that direction.

Attached is the picture I'm talking about...
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Old 04-20-2015, 08:00 AM   #7
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...

I can't even...

Did that even work ONCE?
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Old 04-20-2015, 09:53 AM   #8
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Lol, nice.

To bend like that the bumper mounting bolts had to have failed, or the frame rails bent together.

Nat
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Old 04-20-2015, 11:04 PM   #9
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new plan is to get longer all thread grade 8 bolts, install them from the frame out so the bolt thread sticks out of the bumper, use the first nut to hold the bumper on then put the bracket on and use a second nut to hold the bracket so the load is transferred to the frame, not the bumper
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Old 04-21-2015, 12:37 AM   #10
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I like the way they extended the bumper so the pintle would be closer to the trailer.
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