Shimano Di2 12 Speed CS-R7101 CS-R8101 CS-9200 11-34T HG Cassette 105 UT DA-OE
Weight: 359g(r7101) / 344g(r8101) /253g(9200 ). Cassette & Chain & Crankset. Hyperglide+ sprockets have been designed to reduce weight with improve teeth shaping providing accurate shifting and reduced wear.