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Mmm not sure how you worked out 500g+ for disc versions of the same models. Surely more like 150-200g?
Super_653-
I assume because wheel and groupset weights don't account for the discs themselves? Them shits are heavy.
FWIW I have a disc Road bike as my only bike. It's great and does absolutely everything I need perfectly. That said, if I were to do it all over again I am not convinced I would go discs. There will be some mad rim brake bargains over the next few years as everyone sells up and goes disc too... #savetherimbrake etc
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Just an example https://bikerumor.com/2015/07/09/2016-cannondale-supersix-evo-caad12-road-bike-lineup-actual-weights/
TBF I did exactly the opposite and got a rim brake road bike. It's light, but I have to swap wheels when the roads are dirty, and that's 75% of the time here. -
Assume an additional 500gr minimum, going from rim to disc on an otherwise identical build. Beefed up fork, full length housing (hoses), rotors(assume approx 180-200gr), rotor bolts/lock rings, heavier shifters (like 150gr heavier straight off the bat), likely heavier wheels.
I'm afraid you are simply underestimating this by quite a long shot.
Hope that helps
crow
Netakure
SimonE1
Yet if you get a bike with the exact same spec but rim or disc you'll get over half a kilo on the disc. As for the lower carbon grade is not a massive difference, maybe 200-300gr over an S-Works.