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1A tire not mounted straight does not cause much lateral force on the rim. I think we need more info on the nature of the ‘bulge’ and how pronounced it is– Argenti ApparatusCommented Jan 1, 2019 at 17:41
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1Where is the bulge located (all around or ? ). Is the tyre pressure correct?– CarelCommented Jan 1, 2019 at 18:17
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2This most commonly occurs near the valve, where the extra thickness of the tube causes it to get caught under the tire bead.– Daniel R HicksCommented Jan 1, 2019 at 19:19
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Marathons are a pig to fit on the rim. Did you do anything to try and "stretch" them ? That may have caused tyre damage by tearing the bead making a weak spot.– Criggie ♦Commented Jan 1, 2019 at 20:55
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On re-reading you describe it as "right then left" (of the centerline I assume). Is the rim true? That is - does it run in a flat circle or does the rim move left and right as well? Have you checked for broken spokes?– Criggie ♦Commented Jan 1, 2019 at 21:02
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