For use with Shimano Deore XT RD-M8100-SGS rear derailleurs. "B" Compatible with RD-M9100-SGS but differ in materials, appearance, finish, size, et The "B" which indicates that the Parts are usable, but differ in materials, appearance, finish, size, etc Type Rear derailleur Inner plate Brand Shimano Model RD-M8100-SGS MPN Y3FW26000 Number of Speeds 12 speed For Bike Type Mountain Bike UPC 192790594026 Part Type Bicycle part .
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