RENTHAL SPROCK R 520 49T SI UL SC 216U-520-49GPSIFRONT SPROCKETS, CNC machined from case hardened and core refined 655M13 Nickel Chromium steel, Machined self cleaning mud grooves at each tooth to help increase wear resistance, Certain models available in ultralight design for a 10 15% weight savings, REAR SPROCKETS, CNC machined from a specially enhanced 7075 T 6 aluminum alloy, Machined self cleaning mud grooves at each tooth to help increase wear resistance, All rear sprockets are the ultralight
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