Check frame alignment.
Check frame and fork dropouts for alignment.
Install bars into stem. Snug bar bolts, but do finial adjustment later.
Threaded type headsets: Install stem and bars. Align and secure both stem and bars.
Threadless type headset bikes- align bars and stem, fully secure both.
Flat MTB-type bars: install grips and bar ends, if any.
Check true of both wheels. Correct as necessary.
Adjust hub bearings, if adjustable type.
Check cassette lockring
Install front and rear wheels
Adjust front and rear brakes.
Install derailleur housing and cables.
Install and size chain.
Adjust front and rear derailleurs
Install saddle on seat post
Install seat post into frame and adjust saddle position.
Install reflectors and or lights
Perform initial bike fitment to customer