WOLF TOOTH - GOATLINK 10 SPD COMPATIBLE WITH SHIMANO SHADOW+ 10-SPEED REAR DERAILLEURS (CLUTCH TYPE ONLY) THE GOATLINK IS OPTIMIZED FOR USE WITH WOLF TOOTH'S 40- AND 42-TOOTH GCS AND ALL SIZES OF DROP-STOP CHAINRINGS - BUT WILL WORK WITH ANY 11-40T OR 11-42T 10-SPEED CASSETTE. DIRECT MOUNT-NATIVE FRAMES AND SRAM REAR DERAILLEURS ARE NOT SUPPORTED. YOU WILL NEVER NEED A LONGER B-SCREW WITH THE GOATLINK *DUE TO VARIATIONS IN DERAILLEUR HANGER GEOMETRY, CHAINSTAY LENGTH, CHAINRING SIZE, B-SCREW ADJUSTMENT, AND SUSPENSION CONFIGURATION, INDIVIDUAL RESULTS WILL VARY SLIGHTLY.