Sram apex 10 speed rear mechthe apex rear derailleur represents the same design philosophy that has delivered sram best in class products for the road market features include the new precise exact actuation ratio that offers the widest range of adjustment coupled with a precise geometry to create market leading 10 speed performance features material aluminum body alloy outer cage steel inner cage weight short cage 200g mid cage 210gcage sizes short 28t cage mid 32t cage finish