Doesn't look like alu to me. Cracked TIG weld? Wouldn't ride.
lighter
Yeah, won't be riding but just wondering if it can be welded to repair. I didn't think it was alu but it ain't magnetic. Welds seem very small for alu which is what has possibly led us to this point. It's a decent frame, no idea what it is though.
@Heldring started
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Doesn't look like alu to me. Cracked TIG weld? Wouldn't ride.