Shimano Tiagra 4700/3 10-S Front Derailleur You'll typically find this Shimano Tiagra front mech on good quality ?1,000 road bikes. Similar in design and quality to Shimano 105 For road bikes with 2x10 drivetrains Delivers pro features to sport-level road riders The plated steel chain cage shifts the chain unflinchingly Extra wide pivot link increases rigidity while reducing flex for improved shifting response Aluminium links and band save weight and increase rigidity For road cycles equipped with 10-speed drivetrains Multi clamp band to fit 28.6 and 31.8 frame tubes Maximum difference between large and small chainring: 16t Maximum size big ring: 53t