I see a lot of posts with these sub 14lb Tarmacs that have no real ultra light parts and honestly I'm baffled. I've built well over 60 bikes for myself and others and getting a bike under 14lbs (with pedals and cages) isn't easy. A medium SL3 frame is 890g. A small (essentially a medium) Ridley Helium is 900g. The bike I spec'd out above would be just over 14lbs. It has very light brakes and a light crankset and pedals.
mine has some light parts, but i didn't choose anything that i would not race or run on a daily basis. all of the items i've had lots of experience with. no "ax lightness" stuff on here. gotta be functional and durable...and THEN i'll consider light. i essentially rode this build (yes with 606 wheel combo) during the everest challenge. fun!
here's a parts list for mine, at 13.8#:
56 frame & fork - (1235 w/ cut steerer; includes cable guide, bottle cage bolts, but no PF30 cups/bearings)
crankset...WITH power meter - 620g
di2 shifters, derailleurs....internal wiring, internal battery - 703g
keo blade ti pedals - 185g
fizik antares 00 saddle - 135g
eebrakes (love them! they also happen to be light) - 180g
404+808 (tubular) wheels, skewers, with corsa's...and glued heavily (with 11-28 cassette) - 2108g
ritchey carbon post (cut)....but WITH an internal di2 battery - 210g
pro vibe carbon bars (not the lightest) - 222g
3t arx team stem - 125g
nokon brake housing, bar tape, da chain, chain catcher, 2 cages -- ~500g
there are some other small bits (top cap, computer mount, etc) not broken out above but included in my weights.
when i weighed the full package last night it was 6,274g = 13.83#.
i had all those parts on an SL3 and rode the hell out of it last year (including tons of climbing, descents, cattle guards, some dirt roads)....all bomber.
only thing is that the weight includes tubulars which i don't ride every day, but i DO ride 404 clinchers daily. the 404CCs (+ tubes & tires) add a little weight over the 606T pair (heavily glued--i mention that because when i weigh rim + tire then compare rim + glued tire, the glue adds a fair bit).....but even with 404CCs that is at or very near 14#.
and, again, this is with d2, power meter, deep wheels, 2 cages, pedals....real world.
if i threw lightweight wheels on it, it would be 12.5-12.75#, for sure.