I do not see how a thread about climbing wheels is complete without a post about Obermayer Lightweight wheels
https://lightweight.info/en/wheels/obermayer-evo. The Obermayer EVO's are 1230 grams for the disc wheel set with 24 mm rim width. These have to be the MOST funner of all the climbing wheels.
And most probably when you lean your bike against the coffee shop outside wall to go inside for a shot of espresso, you will sit on the top of the pyramid for having the most expensive and lightest and funner wheels of the day.
I ride the Fast Forward - F4R FCC. If I am doing a hill climb race / event, then I have lighter wheels.