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: 6 Post(s)
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On a new bike, the most likely cause is a loose crank arm. If that's the cause do not ride the bike until it's been attended to, otherwise you risk wearing the crank/spindle interface to the point that it can't be repaired.
There are other possibilities, but given that it's new, and just about due for the free 30-day check/adjust offered by most bike shops, I suggest you bring it in telling them of this problem and any other anomalies you've found. While there, and them for a short course on basic user adjustments and care, so you'll be better equipped for future minor issues.
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