For custom big caset use.
For road and mtb use.
Mtb 40-50T custome use extend hanger.
Road custom 32-36T use.
After change big caset,setting no ngam.
Then this is a solve problem for you.
Extend rear deraileur hanger.
All problem,setting no cun,all problem solve.
Free pos west.m.
East.m add Rm10.
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