K-Edge GO BIG Pro Saddle Rail Mount - Black GRAVEL The varying number of pins

The varying number of pins for each of the three chainring combinations (34/50

With MagicZero automatic calibration

that’s just silly

Ideal for wider tyres

Width Drops: 38

K-Edge GO BIG Pro Saddle Rail Mount - Black GRAVEL The varying number of pinsThe NEW Pro Saddle Rail Mount is designed to lock your Go Pro interface action camera or light securely under your saddle with unquestionable reliability. All aluminum design improves video clarity by removing the plastic mount shake. Warnings: These instructions are generalized to accommodate a wide ranges of setups for a bike. If your setup does not match what is being described, take extra care in the process of your setup and contact K Edge