The Erox front derailleur is designed to shift flawlessly with both standard and compact gearing combinations. A beautiful derailler with high quality, serviceable and rebuild able pivots is the perfect match for any of your finest crank sets and chains.Capacity 16T for double chain ring, top teeth 50-56T, 10 speed fully shimano compatible. Sizes 28.6 0r 31.8mm clamp diameter. Braze on style also available. Carbon and CNC alloy body.