Originally Posted by
Campag4life
You mention you service your bikes and you ask what crank preload is? This is no slight on you. But crank preload is bike maintenance/build 101. Your maintenance efforts are misdirected if not focused on the BB which requires more attention than any other aspect of the bike including headset and wheel bearings.
BB30 doesn't really have adjustable pre-load like, say, Shimano Hollowtech cranks or headsets do though does it? Pre-load is supplied by the wave washer, and the cranks tightened down onto that to a specified torque. I suppose you can adjust pre-load by adding washers.