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
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A loose bottom bracket is a definite possibility, one very definitive test is to jiggle either arm sideways and see if you can see movement on the opposite crank arm.
probably the most common problem that manifests like yours is a loose crank arm on the spindle. Idf only slightly loose they click or creak, in more extreme cases there's more movement and more noise, and it occurs twice per crank turn as the rising arm is pushed back be the back leg, then when it comes over the top is pushed forward by the (now) front leg.
Test for this by pushing both cranks to the floor at the same time, then gently backpedaling and pushing both down again. If a crank is loose you'll see or feel movement.
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”
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