Installing a bottom bracket is an interesting process of trial and error. It all comes down to aligning the chainline. The basic idea being you want to center the freewheel in the back with the crank in the front. It’s easy to measure the alignment of the freewheel in the back, so it’s just a matter of getting the crank to line up.
- Screw on the bottom bracket cups and roughly center the bottom bracket
- Put the crank on
- Measure the chainline, if it’s all lined up, go to step 7
- If it’s not where it’s supposed to be, take the crank off
- Adjust the bottom bracket cups to improve the alignment
- Go back to step 2 and repeat
- Things are properly aligned, so measure how far the threads are exposed on each side
- Take it all apart
- Generously apply Loctite to threads of the BB cups.
- Thread it back in using the measurement from step 7 to get the alignment right.
- Pray to God that the Phil Wood logo lines up in the star cut out of the frame because that would look awesome
- Jump up and down in victory
- Attach the cranks
Didn’t get a good picture until a bit later and a few more components were installed. Oops.
The italian frame adds an extra kink – both sides of the bottom bracket are threaded right-handed. As a result, the left side has a tendency to unscrew itself. Less than ideal if you find yourself on a long ride. Best you can do is crank it down during the install and put Loctite on the threads.