Originally Posted by
cyclist2000
I guess I don't get it, what id different between a DI2 rear wheel and a Ultegra mechanical rear wheel? If you have to change the wheels in a pinch, don't you just take it off the backup bike and put it on the Primary bike?
Or if there is a problem with the primary bike, can't you take the backup off the trainer and ride it. I mean, it is a backup. You have to take the bike off the trainer to get the wheel anyways.
Challenge isn't with Di2 vs. mechanical wheels. It's rim brake vs. disk brake wheels.
Totally agree with just riding the backup bike if there is a problem though.