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NEW e*thirteen Helix R Cassette 12 Speed, 9 50t, Nickel type_chainrings bmx sprockets Weight: 225 g price_changed_on_2025 07 21 Weight: 225 g Full length semi auto lock YKK zipper with rubber pull tab The 9 tooth cog lets you step down one chainring size while keeping the same top end gearing and provides not only better ground clearance Cassette Body Type: SRAM XD 11 12 Speed
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