Craig has a 12-speed Shimano Dura-Ace Di2 group. Justin has the new SRAM RED AXS group. We asked them to switch bikes and compare drivetrains. Which of these top-tier groupsets is the best? Craig and Justin did a big ride together and gave us their uncensored thoughts.
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0:00 Freaky Friday on Flagstaff Mountain
2:52 What’s your history with Shimano vs. SRAM?
3:59 Controls & ergonomics
6:48 Rear shifting performance
8:18 Front shifting performance
10:40 Pedaling feel and gearing
11:56 Braking performance
14:04 Final thoughts
![](https://i.ytimg.com/vi/oCTOAfNuBuw/maxresdefault.jpg)