I can get a good deal on a 2014 Cervelo P5 Six Dura Ace but it doesn’t have electronic shifting, which I’d like. Is this an easy change to make? Also, I thought I read something about wheels not necessarily fitting. I have HED J6’s, 700’s, clinchers, I’d like to use. Would this be a problem (I assume in the rear)?
No problem with those wheels on a P5. Plenty of clearance.
Yes it will take a Di2 gruppo no problem. There is a spot in front of the rear wheel for the battery to go hidden from the wind which is rad. You might need some small accessories for the top tube for the di2 wire routing, I’m not sure.