To go faster! Better chain engagement and less drag/friction with the sideplates
Do some training, eat less pies... you'll go faster. Polishing a cog is pointless.
Infact shaving legs or pumping your tyres hard your would give you more advantage than polishing a cog.
@adman started
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Do some training, eat less pies... you'll go faster. Polishing a cog is pointless.
Infact shaving legs or pumping your tyres hard your would give you more advantage than polishing a cog.