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Hey guys, today is the day to transform a 27-speed bike into a 9-speed bike, by installing a 36-tooth Narrow Wide chainring. #bike #mountainbike Subscribe to the channel and follow our social networks: ♦ Facebook: / canal-montanha-acima-1885850561679142 ♦ Instagram: / montanhaacima ♦ Strava: / strava ♦ / strava