Odyssey la guardia sprocketa total redesign of odysseys popular mds sprocket with a built in full guard this sprocket lives up to its name helping to protect your chain from anything you can throw at it sprocket thickness increases towards the guard area for greater strength compatible with all chain widths machined from 7075 aluminum features material 7075 aluminum teeth 25t weight 130gbuyodyssey componentsfrom chain reaction cycles the worlds largest online bike store