JGbike 9 Speed 1x9 groupset Compatible with M2010: Right Shift Lever,M2000 3010 Shadow Rear Derailleur, Sunrace 11-40T 11-42T Cassette M990, KMC X9 Chain;

Package Details
- Sunrace CSM680 8AX 11-40T MTB Cassette*1

- Product menu *1

- JGbike branded 22mm rear derailleur link, hanger extender*1

- New in retail package

Product Feature & QAs
Q: What cassette or rear derailleur is it compatible with ?
A: It's designed for 8 speed MTB driven system, compatible with most of 8 speed cassette or driven system including Shimano & Sram

Q: Is it work for 1x8, 20 speed or 30 speed?
A: Yes, Sunrace better gear ratios than Shimano at the same weight, the only one design which is compatible with 1X8, 2X8 or 3X8 speed as long as a longer chain;

Q: Do I need to replace my rear derailleur, Chain or buy long B-screw?
A: It comes with a free 22mm hanger extender to lower your rear derailleur to release large cog for even short and medium cage, you don't need buy B-screw or other adapter, probably you need a longer chain if you use less than 116 link

Q: What's the gearing advantage?
A: Spider Material: Steel, Q: What are the specific cassette it can replace?
A: Generally all 8 speed MTB cassette including Shimano Alfine, Acera, SRAM