Shimano Dura-Ace 7970-Di2 SM-EC79 diagnostics tool

rearviewmirror · August 25, 2011, 2:49am

There’s nothing quite like a drivetrain that utilizes a $400+ dollar diagnostic tool.

Hide · August 25, 2011, 4:43am

First look of that I thought it was the battery charger…

horatio · August 25, 2011, 4:43pm

We buy an allen key, rich Fred buys this instead…