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Mechanic Gurus: Let's play noise detective!(7 posts)

Mechanic Gurus: Let's play noise detective!nestorl
Sep 29, 2001 2:28 PM
This is the problem:

Brand new frame, no craks, no loose bolts. BB tight, cranks tight, head set right.

No it is making a loud metalic noise only when I am OFF the saddle, and ONLY when I rock the bike while off the saddle.

NO noise when I am on the saddle, and no noise when I am off the saddle keeping the bike steady.

Any takes? Possible guilty parties, IDEAS? Thanks. Nestor.
re: Mechanic Gurus: Let's play noise detective!Tig
Sep 29, 2001 4:08 PM
My first guess would be the handle bar stem since it gets more lateral input while you are out of the saddle. Could be at the bar clamp end instead of the head set end. Kinda' hard to tell without seeing the bike in person.
Yes, try greasing the bars under the clamp. (NM)Highgear
Sep 29, 2001 5:58 PM
nm
Yes, try greasing the bars under the clamp. (NM)noupi
Sep 29, 2001 6:18 PM
NM is right,
I had the same noise when off the seat and pulling
hard on the bars going up a hill.
2001 trek 2200 the graphite bar and the clamp were the
culprits....
A bit of grease and all is well.
re: Mechanic Gurus: Let's play noise detective!mackgoo
Sep 30, 2001 4:15 PM
Chain ring bolts/screws.
Valve stem?Atombomber
Sep 30, 2001 6:42 PM
My 60mm valve stems seem to rattle a bit within their holes. No biggie though.
re: Mechanic Gurus: Let's play noise detective!Andy M-S
Oct 1, 2001 6:45 AM
OK, I'll take a shot. The conditions you describe are those usually met in climbing, when you've run out of gears (as in--"Dang, I thought I had a 25 on there, guess it's only a 23!").

Given that, I'd check clearance between your rear derailer and your spokes. It's possible that the RD is just hitting the spokes enough to make this noise (which is, indeed, loud).

Of course, if you get this sound other times than when you're in the bottom gear, forget this analysis. If you do get it and only in the bottom gear, then try setting your derailer limit screw so that the derailer can't get so close to the spokes.