ZWIFT COG V2 (VIRTUAL SHIFTING SPROCKET) Fix

11-Speed Bicycle Chain

Chain elongation, commonly referred to as 'stretch,' causes the chain's pitch to exceed the Cog's design specifications. This prevents the rollers from seating properly in the tooth valleys under torque, leading to the chain jumping over tooth peaks during high-wattage efforts or sprints. Replacing the chain ensures a 1/2 inch pitch match with the Cog's teeth.

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Zwift Cog Replacement Kit

If the chain is new, the skipping may be caused by premature wear or deformation of the Cog's teeth, particularly if used with an old, worn chain previously. In some V2 units, the plastic spacers or the sprocket itself can develop play, leading to mechanical skipping that cannot be resolved through derailleur indexing.

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Freehub Body Pawl Spring Kit

If the skipping occurs internally while the chain remains stationary relative to the Cog, the failure is located in the freehub's engagement mechanism. Weak or broken pawl springs fail to keep the ratchets engaged under load, causing the internal drive mechanism to slip forward abruptly.

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