I updated item 1 to clarify that I'm asking about rim width, not tire width.
Originally Posted by
MinnMan
1. Some do, some don't. It depends on how wide a tire and contact patch you want and what kind of riding you do. I chose the 25 mm.
2. Deeper section, more aero. Shallower section, fewer issues with cross winds. Personally, if I'm going to get carbon wheels for the purpose of optimizing aerodynamics, then deeper sections are better - hence I went with 55mm. YMMV.
3. Your call.