Rim width on Giant Propel Advanced 1

Hi guys!
been doing tons of research but have yet to find a definitive answer.
Currently using a 2015 giant propel advanced 1 and I intend to change my wheelset from a stock Giant PA-2 to a Zipp 404 but I am concerned if it will fit. I understand that giant propel's brake set are relatively small in clearances so it abit of a concern. I do know the max tyre width I can go is 23mm but I cannot find any info on rim width. Has anyone fitted a Zipp 404 on your giant propel advanced with SpeedControl SL brakes?
Also, can anyone enlighten me on how to read the E.T.R.T.O? on my Giant PA-2, it reads 622X17C. I know the 622 refers to the wheel diameter but what about 17C? what would a smaller number i.e 16C mean?'
Many thanks!
been doing tons of research but have yet to find a definitive answer.
Currently using a 2015 giant propel advanced 1 and I intend to change my wheelset from a stock Giant PA-2 to a Zipp 404 but I am concerned if it will fit. I understand that giant propel's brake set are relatively small in clearances so it abit of a concern. I do know the max tyre width I can go is 23mm but I cannot find any info on rim width. Has anyone fitted a Zipp 404 on your giant propel advanced with SpeedControl SL brakes?
Also, can anyone enlighten me on how to read the E.T.R.T.O? on my Giant PA-2, it reads 622X17C. I know the 622 refers to the wheel diameter but what about 17C? what would a smaller number i.e 16C mean?'
Many thanks!

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hey izza, did you change the brake pads to thinner ones? just to check, are you using Giant SpeedControl SL brakes or Fouriers ones?
Have used both and changed to stock Enve pads.