Review on 🚀 SHIMANO Zee SL-M640 10-Speed Shifter by Junior Andreano

This uses a Shimano Dyna-Sys derailleur which has a different gear ratio than other manufacturers derailleurs 9 speed and below. My derailleur is an M6000-RD Deore 10 speed and I tried shifting it with an M4000 shifter but was unsuccessful as there wasn't enough traction. The M6000 shifter wasn't stock here at Revain, but the Zee was cheaper and virtually identical. Now Shimano Zee shifts the M6000-RD and I have no more shifting problems! Great switch and worth every penny.