Join Date: Apr 2009
Location: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
Mentioned: 22 Post(s)
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Random sporatic sounds are almost impossible to diagnose without hearing them, then sometimes the tone helps. It's possible that something is moving but only with the higher energy of a bump. It could be an insufficiently tight crown race, or the axle shifting in the dropouts as the two blades flex independently of each other, or up in the handlebars or stem.
As long as it's rare, you're probably OK to ignore it or try simple remedies like increasing the tension of the front QR. Other than that there's just not enough to go on, which is probably why you're not getting a ton of suggestions.
An ounce of diagnosis is worth a pound of cure.
“Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin
“One accurate measurement is worth a thousand expert opinions”
- Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance