BUT...the main benefits of disc brakes are in crap weather, so I don't yet see the benefits for (most roadies) racing,, until the weight comes down, and the pros use them, in which case it will be business as usual.
Or the main benefit are going down cols at around 60km/k as well (I know it's irrelevant on an UK based forum).
As per weight. There is two issues about it, pros and joe average rider. Pros... Well contrary to popular belief pros aren't as obsessed as your average racer wannabe with weight. The would happily gain a couple a hundreds of grams for something they perceive of being beneficial (good example is dropper seat post in enduro racing). Plus as Al said, all bike are now under the minimum weight limit. So it will be some disks rather than some lead.
Your joe average roadie, more than happy to flash cash on something that will help him and his beer belly stop more efficiently. Which obviously leaves us with the remaining of the neighbourhood champion. Maybe disk brakes should be sold with a bottle of MTFU and some humility potion.
Second. I am not quite sure disk will be heavier. Most of the braking system is made of rather heavy iron/carbon alloy. Back in the days, the formula B4 in 160/140 was as light as a pair of XTR V-brakes.
And third the wheel change. Well maybe you should start buy putting some disks on your MTB and see how easy it is to swap wheel...
I Have yet to come with a problem when the disks are of the same diameter.
I ride road just as much as mountain; it's inadvisable to make assumptions based on the limited information you have about me.
