Review on Upgrade Your Shimano M2010 with JGbike 9 Speed 1x9 🔧 Groupset: Right Shift Lever, Shadow Rear Derailleur, 11-40T Cassette, and X9 Chain by Adam Townsend

I installed this group and spent over 6 hours getting it to shift smoothly. FINALLY figured out two problems I had with it. Hope this helps others! 1) You don't need a JGbike derailleur hanger extender to remove a 1x9 40T cassette! As others have pointed out, the included hanger is junk and twists under pressure. Install the derailleur directly to your bike's suspension. 2) Install a longer B-bolt to adjust the derailleur to be closer to the larger cog. I got an M4 x 25 screw from a local hardware store that was just the right length. After addressing these two issues, the switch is now working great! 1 click per shift down/up!