Originally Posted by
rpenmanparker
You know you can turn the stem over and make it -12. The shim can be used to either raise or lower the stem further. +4 raises the bars, -4 lowers it. Keep in mind the -17 is horizontal when your head tube angle is 73 deg.
Thanks for the reply, I'm learning a lot.
The head tube angle on my bike is 72 currently. Does the +4 or -4 come into effect depending on whether I flip the stem up or down? Because I only have one shim labelled +4, -4, where as in the specialized picture it comes with 3 different ones.