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Uoeno
timbre
Factory tube forming, not a dent. Same sort of thing appears on a lot of alu frames to aid clearance for gears, disc rotors and whatever.
Mine & girlfriend's Pre Cursas have them, but my Track Champion and Pursuit Champion don't.
Most likely same tube used on a different frame, for a different manufacturer, requiring more drive-side clearance.
TC1 stays aren't as sculpted as those on Track/Pursuit Champion; probably a bit cheaper to make.