Shimano Di2 SW-R600 Remote Climbing Shifter

Good switch works well. Might be a bit bulky but it does the job. Great when you're tired and riding the tops.;

I am giving this shifter 5 stars because the company refunded my money after I discovered it would not fit my bike. Make sure you check your control input attached to your shifter to make sure you have an available input for this climbing shifter. I have a 2016 S-Works Tarmac Di2 Disc (Dura Ace shifters) and looked on YouTube to see how this shifter would install. Seemed pretty simple just plug it into the control box on one of he existing shifters. I then did a quick check of my control box by pulling up the rubber shifter/brake lever cover and it looked like there was an available input just as the YouTube tutorial described. Unfortunately when the climbing shifter arrived and I tried to install it I discovered that the second input was a dummy and had no hole to connect the wire from the climbing shifter. My fault entirely since I did not check closely enough before buying but they refunded my money since It would not work. On the item description it only lists a prior model Di2 that is not compatible but it does not state that you should verify that you have an extra input in order to hook it up (from what I read they all had two inputs). They probably figure that would be obvious which it probably should be:);

Are they worth the money? No. Are they fun to have? Yes.
I was one of those unlucky ones who had to upgrade my junction box from 3 to 5.;

a must with a di2 setup!;

Oh man...if you have a road bike and like to climb with your hands on the top of your handlebars...this is a MUST. Sooooo nice not to have to reach down to the levers to switch. Used this twice and it is great. Wish they would make something that would be smaller as it is kind of bulky but it is worth it.;