Shimano Altus Rear Derailleurs.Advanced light-action designTeflon-coated bushingsDirect-attach rear derailleursItem SpecificationsColorSilverWeight326gIntended UseMountainCassette SpacingShimano/SRAM 8Shifter/Derailleur CompatibilityShimanoLargest Cog34teethChain Wrap Capacity43teethDerailleur ActionTop-Normal (Traditional)Cage LengthLong