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e*thirteen Helix R 107 BCD 4 Bolt Chainring 42t 11 12 Speed 107BCD Black MFPN=A1007 Small: 186mm Weight 653 Small: 186mm 0 Adapter w Lock Category Racks for bikes Chainline is set by SRAM® Crank assembly Compatible with 4 bolt 107 BCD SRAM® cranks and Quarq® power meter cranks
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