Blackspire

<p>The SuperProX series is a performance option for those looking for prime shifting capabilities, designed for use with the Shimano® XTR M960 Crankset. This is a ramped ring with modified shifter gates and special profiles to allow hassle-free shifting.</p><ul><li>CNC cut from 7075-T6 aluminum</li><li>Middle and outer rings are cut from a thicker 0.190 material to prevent the chain from falling between the granny and middle ring</li><li>Middle and outer rings have stainless steel shifting pins to enhance shifting</li><li>Works best on a 9-speed drivetrain</li><li>For use with the Shimano XTR FC M960 Crankset</li><li>These chainrings will not work if mixed with other brand rings; for best performance, use only with other SuperProX rings as a set</li></ul>

Blackspire 64/22 SuperProX Chainring

Bolt circle diameter (BCD): the diameter of an imaginary circle that intersects the centre of each chainring bolt.

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Blackspire 64/22 SuperProX Chainring

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