Old 03-16-20, 05:37 PM
  #18  
tmhudg
Member
 
Join Date: May 2009
Location: South Central Mass, USA
Posts: 39

Bikes: Trek 2500, Co-Motion Steelhead

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 17 Post(s)
Liked 10 Times in 4 Posts
Originally Posted by mtseymour
Even in full synchro mode, the computer doesn't take over. Depending on the terrain, I might downshift from the 50 to 34T sooner than the programmed shift point. I might also simultaneously downshift the front derailleur, and upshift one or two gears at the back to get a smooth transition. Unlike eTap, Di2 is able to shift front and rear at the same time.

The full synchro mode also acts prevent a severe cross-chain when I downshift too far in the rear (eg. from 28 to 30T) while in the big ring. This is especially useful in rolling terrain with abrupt transitions to steep climbs.
Yeah, I know - poor choice of words. I did have an experience where it was fighting me though. I went to make a double shift in anticipation of some change in terrain (can't remember which) and it shifted the rear back to where it wanted it not where I wanted it. Actually, I'm not sure if I was in semi-synchro or full at that point. I did my last ride in semi and it seemed a little better/smoother and more "controlled" I guess - although it did let me cross chain big ring to big cog like you said full would prevent. I'll keep playing with things and keep an open mind.
tmhudg is offline