I have a bike with about 3000km on it and in the last few months there is a noticeable creaking off the drive train, really only heard when going up hills excess of 6%.
There is a brand new chain on it, and the chain ring bolts have been tightened numerous times.
The bottom bracket is a BB383Evo, and the crankset has carbon cranks.
When turning the cranks they feel rough and it can also be felt vibrating through the frame.

Is it common for a bottom bracket (assuming thats the problem) to go so early?