Bicycle yellowyellow

Shimano Di2 crash mode reset guide Shimano Di2 crash mode can make your bike feel completely dead after a fall, a rock strike, or even a hard knock in the garage. The shifter still clicks, but the rear derailleur stops moving. In many cases, that does not mean the derailleur is broken. It means the protection function has stepped in to protect the motor and linkage. If you want the short answer first, here it is. On many current 12-speed Shimano Di2 rear derailleurs, the reset is done by turning the crank and shifting toward the largest sprocket, then shifting back toward the smallest sprocket. On older wired Di2 systems, the reset often starts from the Junction A button. On the newest wireless gravel and MTB derailleurs, Shimano has moved to Automatic Impact Recovery, so the behavior is different from the old-style locked crash mode. What Shimano Di2 crash mode feels like The most common symptom is simple. The bike was shifting fine, then after an impact the rear shifting stopped....