Oh, I'd like to add: Seatposts
The Thomson micro-adjust seatpost is probably the best ever.
There is an older seatpost design where the seatpost top is simply a tapered tube and the clamp grabs the tube at the bottom and it's sides grabs the saddle rails. You see this on cheaper bikes now.
This system allows for the saddle to turn sideways like a turret back and forth.
So, getting away from that system is HUGE.