Join Date: Jun 2005
Location: Pagosa Springs, CO, USA
Bikes: Road, MTB, Cruiser, Chopper, BMX
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The ringing sound, sort of like running your fingers around the rim of a wine glass, is most likely your disc brake rubbing.
As for the rest of your woes, look at the chainline when the bike is in the stand. The middle/small combo may be so angled that you are catching the edge of the second cog or the front chainring, or burrs on either.
If that's not it, my guess is your chain is stretched and/or your smallest cog is worn. Yes, a stretched chain will give you problems in just one gear combo, especially if it's the cog that has the least amount of teeth, therefore the first to wear, and if it's the middle ring which almost always wears out first due to every shift up or down going through it.
The way you talk about your chain makes me wonder... The info I pulled up that matches the specs you've given shows the M80 as a 2005 model. Have you replaced the chain since the bike was new?
Originally Posted by ahsposo
Ski, bike and wish I was gay.