Hxr components 42t pack kithxr components 42t pack kit offers a great way to modernise your current 10 speed gearing by giving you an extra climbing gear so you can run a single chainring up front this will mean you can ditch your second chainring front derailleur and front shifter features material hard anodised aluminium 16t sprocket included to replace either your 15t or 17t sprocket 3 specific spacers for shimano or sram and an m4x25mm b tension screw designed for 10 speed usebuyhxr c