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BBS PART# J59-18673
Origin-8 Track Cog Lock Ring with left handed threading and 1.29x24tpi, required for the safe installation and use of a track / fixed gear cog on a standard track hub. The lockring holds the track cog in place and prevents the cog from unthreading from the hub. Always have a qualified professional install the lock ring to ensure proper installation, as failure to properly install the lock ring can result in damage to the hub and may result in serious injury.