🚀 SHIMANO Zee SL-M640 10-Speed Shifter Review

The price corresponds to the quality. Great shifter that allowed me to upgrade my 2012 Paradox to 1x10. Quick and easy installation with a stylish design.

Works great, what it's supposed to do isn't that different from some others but I think the light weight is the reason for the pricing

I am very happy with this derailleur for my 1x 10 speed conversion. It matches the Zee shifter I bought and shifts pretty flawlessly compared to my 3x. You can't go wrong here as long as the price is right

Bought to replace a 10 speed SLX that fell apart on the track. Gearing is okay, although the paddle shifters are a bit plasticky and lever travel is a bit harsher than the old SLX. Deducting a star because it is not compatible with my specification b

Used to convert 1x10. Worked great for 6 months. Enjoy the ability to downshift multiple times. I ride medium weight XCs and haven't had a single crash since the conversion. One morning the gear selector wouldn't engage when downshifting. I took it to LBS for the pros to review. They washed it away and couldn't fix it, claiming it was no longer good. I trust this store and go to Saint. Very surprised/disappointed with the Shimano product.

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.