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Originally Posted by Jack Jones
To relieve the pressure (hot gasses) from inside the square tube. Otherwise, the molten weld would blow out.
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I would agree with that, but it also appears that all of the cutouts are centered in each of the wheel chambers - perhaps this will be a mounting point for the lower bearings for each wheel assembly.
16 pounds, eh? Thats not too bad. And with bumpers, it looks like that frame will be able to take quite a beating.
_Alex