bottom bracket sizing + single chainring
I have a 2009 GTR Series 4
Since I'm not using my smaller chainring, I decided to remove it and leave the larger chainring to shed some weigh via small chainring, front deraileur and shifters.
I already switched out my rear wheel w/ a ultegra 9-speed cassette and a dura-ace 7700 9speed shifters.
Now I'm switching my crankset to dura-ace 7700 also.
I am going to remove the small chainring and leave the large one also, and in order to keep a decent chainline...i'm going to take the large chainring and put it on the inner side where the smaller ring was.
Here's the question since I am only running a single chainring in the front and a 9speed in the back.
What size length bottom bracket should I be using?