Nerve XC - 2011-2012. Nerve AL - 2013. Nerve MR - 2011-2012. Nerve AM - 2011-2012. Grand Canyon AL - 2011-2013. Grand Canyon CF - 2011-2013. CNC machined from Solid 6061 Billet Alloy. Stiffer than the standard cast item for crisper gear changes.
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