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@thegreatvalerio
i seem to have come upon a small, but possibly fatal problem...
the right (non-chainring) crank arm on my single-speed keeps unscrewing itself from the bottom bracket... it started happening a few weeks ago, so i just re-tightened the bolt, and it seemed ok, till it happened again this week, and tightening wouldn't stop it from happening with increasing regularity.
now...i'm not sure if this means that it is simply the bolt that is scuppered, or if it is something even more troublesome....anyone have any ideas?