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Old 10-28-2014, 07:51 PM
cmbicycles cmbicycles is offline
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Join Date: Apr 2012
Location: Richmond, VA
Posts: 5,077
It's probably not a 6mm, your measurement looks to be the inside diameter of the threads (comes out to 1/4") but the threads/bolts are measured on the outside diameter so yours is bigger than 1/4". Try a couple bolts to verify the size or call a cannondale dealer or two. I have a few random ones i can measure and let you know.

Last edited by cmbicycles; 10-29-2014 at 08:50 PM.
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