Originally Posted by
abarth
What method do you use to check if the bottom bracket needs to be face? Is using a caliper to measure the length at various points on the bottom bracket a good enough method?
Caliper tells you nothing. With a painted BB shell it's evident either by tool marks or removal of point that facing may have been done. If there's any doubt, measure the width and face it. Severe BB shell facing errors show up in bottom brackets after installation as binding all around/unusual spots. Or a BB that spins fine until it's fully torqued.