Originally Posted by
genejockey
I imagine it's a lot cheaper for teams to just have ONE model of TT bike which works in all conditions, since the race doesn't wait for nice weather.
There would be no point in having 2 brake specs unless there was a clear performance advantage. For a couple of years in the World Tour we saw a few climbing bikes remaining with rim brakes, notably Pog’s Colnago, where he alternated with the disc version for specific stages to save a few grams in the big mountains. But that wouldn’t matter on a TT bike. Now that the aero is optimised around disc brakes and they actually brake better, there is no reason to make a rim brake version.