Originally Posted by
Bezalel
40mm doesn't seem too long for an aluminum steerer. Check the fork and headset documentation to see if there are any limits for spacers above the stem.
For a carbon steerer 40mm is generally too long. (Many carbon steerers require 5mm above the stem)
He's not mounting his stem at that height. Read his post.
OP: I'd cut that down *maybe* for safety reasons.