Hi:
I recently upgrade my scott speedster S50 from shimano sora components to a shimano duraace - ultegra mix. From the moment I installed the duraace crank, i had a strange clicking noise coming from the crank. It clicked only when aplying a lot of force, that is while riding standing up, on the small front cog and on the 3-4 biggest rear cogs, only on steep hills. I isolated the noise only to the drive side, as pedaling only aplying force on the left side would eliminate the noise completely, doing the oposite would increase the noise.
I greased everything on install, checked chainring bolts, bb cups, etc and couldnt get the noise off...
Today i came back home from my mothers house, I had left the bike upside down as I took my recently build rear wheel for some touch-up truing, sat on the chair, and noticed a nice-ass CRACK on the rear of the crank!!!
It only has 296 km (185 miles for the non-IS). I bought it like one year ago, was the first part I bought for the upgrade. But Dura-ace has a 3 year warranty, so im taking it back to the shop. Being Chile, it will probably end in the shops trash, but being a mechanical engineering student, i would like to hear about this from shimano. Anyone knows how to contact shimano directly? And who to contact for a south america sold component? they have no email!
I looked for other crank failures, but i found none of this kind. Anyone seen some thing like this before?
Sorry if my english is bad, have not written in english in a long time.
Have a nice day, Esteban
Here goes the pictures:
