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Nylon fiber OS adapters are designed for use in frames with worn-out, oversized bottom bracket shells - Replaces standard nylon fiber overmolds found on Origin8 Revolvr BB30 and PF30 outboard thread-together bottom brackets - Use BB30 OS adapters with Origin8 Revolvr BB30 outboard thread-together bottom brackets 211051 and 211052 - Use PF30 OS adapters with Origin8 Revolvr PF30 outboard thread-together bottom brackets 211053 and 211054 - Requires a special installation/removal tool (P/N# 610817) - Shell: 68/73mm x 46~46.1mm - Interface: PF30 - Cup Material: Nylon Fiber

• Machined alloy arm • (ISCG Mount) international standard • Adjustable design • Sealed cartridge bearing • Prevents dropped chains on mountain bikes