Originally Posted by
jbchybridrider
Disc's are the future just look at Colnago's most high end road bikes now with Disc brakes. The only reason road bikes have not has them up until now is because rules for racing never allowed them but that's changed.
A lot of development is now going to be put into them for road bikes making them lighter and more compact. As these new developments are made disc's of current grades will become cheaper and eventually all but the lowest end bikes will have disc brakes.
It will be very difficult to add a disk brake to a bike (with all of its extra components) and not add weight. Road racers set the standard for road bikes and the only way they will put up with those extra grams is if, in some way (such as tighter corners), the brakes help them to get to the finish line quicker.
Mountain bikes are more concerned about handling than weight and have mostly converted to disk brakes.