Works Components 40T Cassette Range Extender - Shimano Fitment
40T Extender cassette cog designed to work with your 10 speed Shimano setup.
CNC Machined in-house from 7075T6 - Anodised various colours, machine finish.
To be used with XT 11-36t (CS-M771), XTR 11-36t (M980) with the removal of the 15 or 17T cog and associated spacer. You are also able to remove the smallest cassette cog and replace the lockring with a suitable size.
Will work with SLX 11-36T if 11T cog is removed and lockring exchanged for 13T