B-Gap Tension Screw Adjustment: What It Is & Specs For Every Derailleur ( SRAM, Shimano) | The Pro's Closet
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irox B-Gap Rear Derailleur Tension Adjustment Tool for Gear SRAM Eagle GX NX XX X0 XO 12 Speed Tool Made with PLA 3D Printing Dark Blue Chain Gap Chain : Amazon.co.uk: Sports