My wife just got her Trek 2200 WSD and I have a question about the FlightDeck computer. She has Ultegra levers with one button on each lever hood. Looking at the shimano instructions on the website it looks as though she will need the 6501 model flightdeck which is wireless. The wired model 6500 looks like it needs two buttons on the right lever hood. Do I have to use the wireless model? Thanks
Shimano FlightDeck info