A squeak every 3-4 crank revolutions

fishyweb
fishyweb Posts: 173
edited May 2013 in Workshop
Since my last couple of rides, I'm hearing a quiet squeak every 3-4 pedal strokes. Sounds like it is coming from the general area of the chainset, but cannot be certain. I fitted a new chain and cassette a couple of hundred miles ago, and everything feels as though it is running silky smooth at the moment - apart from this annoying squeak. Any ideas?

In case it is relevant, this is on a Giant SCR2 with Tiagra drive train (triple).
http://app.strava.com/athletes/287459
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