alcatraz wrote:How about a trek domane disc brake? It's got that comfy isospeed decoupler.
I am also interested in a "One bike to rule them all" but as I'm in my mid 30s I don't mind a racier position even though I don't race. On top of the OP requirements I'm also looking for aero gains. A workswell r081 is my top choice so far. This and 404:ish wheels like U-shaped 58mm would do nicely and should come in under 7kg.
My only annoyance is that the frame is not particularly light 1100+400gr. But it's to be expected with aero+disc brake. Bit disappointing though. Maybe a Giant propel disc brake is lighter. Also how do you get around the issue with heavy discs/brake calipers/hydraulic hoses/brake levers? It's really messing with my WW ambitions. I'm thinking maybe a wired setup is good enough.
/a
With your build plan I wonder a bit at how you expect sub 7kg. My build using a Hong Fu FM079-F (a lighter frame/fork), Campy Chorus, and 40mm deep tubular rims came in at 7.56 kg. I didn't go crazy weight weenie on the finishing kit but I didn't pick anything heavy either (Fizik Arione R1, Ritchey Superlogic post, WCS stem, and 40cm WCS Carbon Streem bars). You'll need to use some very light hubs and rotors, skinny tires (not 25mm like mine) and spend some money on a saddle, seatpost, stems, and handlebars to cut significant weight. Your rims will likely weigh more than mine which were ~400 grams each.
The lightweight disc option is mechanical levers and TRP Spyre SLC calipers, but only if you use Shimano levers (not compatible with the pull of Campy or SRAM levers). I had bought a 2016 Chorus group before I learned this so I went with modified TRP HY/RD calipers but they are anything but lightweight, but stop very well.