Sram rival 1 gxp 11 speed road chainsetengineered for precise and efficient chain control, the sram rival 1 road chainset benefits from sram's x sync tooth profile for consistent and reliable performance you can count on. Featuring a cnc machined forged aluminium construction, it works seamlessly with the chain's inner and outer links and benefits from seven available chainrings, so you can tailor your gear range to match the way you ride.featuresx synctrade tall, square tooth design provides maximum chain controlsharp, narrow tooth profile and rounded chamfer edges help manage a deflected chainmud clearing recesses for the inner chain links and rollersarm material forged aluminium with detachable spidercrank arm length 170mm, 172.5mm, 175mmspeed 11 speedchainline 45.5mm, 47.5mmchainring material aluminiumchainring bolt circle diameter bcd 110chainrings available 42 or 50 teethis bottom bracket included noare chainrings included yescompatibility compatible with 130mm 135mm rear frame spacingweight 799g 24mm, 172.5mm, 42t, without bottom bracketpart no fc riv 1 a1technologiesgxpreg gxps gutter seal design cuts friction and weightmdashimproving both feel and performance.x synctrade sram x synctrade 1x chainrings provide the highest level of performance and durability. The sram x synctrade tall square teeth edges engage the chain earlier than traditional triangle shaped teeth. The sharp and narrow tooth profile, as well as rounded chamfered edges, help manage a deflected chain. To provide the best possible performance in muddy conditions, the x synctrade chain rings have been designed with mud clearing recesses for the inner chain links and rollers. Engineered in germany, x synctrade rings are an integral part of the sram 1xtrade drivetrain.buy sram components from chain reaction cycles, the world's largest online bike store.