It's unlikely that tube will be strong enough. It may appear to be stiff, but will inevitably tear at the welds. My Marlin uses solid round bar about 10mm as I remember. Done about 6000 miles with no problem. My Pembleton has 8mm round bar. Too soon to tell if its ok though. But mudgaurds much lighter than Marlin so I am hopefull...
Mudguards that move with the wheels get a lot of pounding. Its a common problem area.
Cheers, Robin
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