Shimano Sora FC-3550 9 Speed Compact Chainset - 46/34T - 170mm Arm - BlackShimano Sora FC 3550 9 Speed Compact Chainset As Shimanos first class 9 speed road bike groupset, SORA is pitched towards sports fitness cyclists. The compact 50 34T crankset can now be combined with a large range 11 34T cassettes, an accommodating rear derailleur, and a long arm front derailleur. Spinning up hills suddenly got easier with two extra teeth over the previous SORA, while the small 11T sprocket makes sure you have enough high end range to