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I think both issues should be viewed separately, I don't see how one affects the other. It always felt to me that disc brakes were superfluous to pro-cycling. The teams, mechanics and riders never seem to have wanted them, it was more something foisted on them from above. If something was likely to give a performance advantage the teams would be quick to jump on them, but correct me if I'm wrong no World Tour teams have used them, only pro-conti and no doubt mainly at the behest of the sponsors.
Motorbikes are a completely separate matter, and a more complex ones as the UCI have to work with the race organisers to do something about and establish a set of regulations. Disc brakes is something they could move on fast and simply suspend them and remove any additional risk. I don't get why this is a contentious issue, no-one was really using them, they made it difficult for the neutral service cars and mechanics and the riders don't seem to want them either. Round peg square hole comes to mind l.
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The teams, mechanics and riders never seem to have wanted them, it was more something foisted on them from above
The teams aren't made to use discs, they are simply allowed to use them in races during this trial period.
If none of the teams wanted them, you'd not see them. Since you're seeing them, some teams clearly do want to test discs.
Based on one incident which no-one knows for certain was caused by a disc? Yeah, definitely legit.
Meanwhile, riders are being injured, and one desperate incident, killed by race motorbikes, ridden with blatant disregard for the safety of the riders.
They really need to sort out their priorities in Aigle.