Shimano ultegra r8000 11sp road double chainsetnow even further enhanced from the previous 6800 ultegra series, the long awaited ultegra r8000 11 speed chainset is finally here. Featuring enhanced performance and aesthetics, it benefits from the trickle down technology of its predecessor, dura ace r9000.transfer power into speedinfused with first class technology, this advanced road bike chainset will make sure you transfer power into speed. With the additional bonus of a weight reduction from the 6800 series without sacrificing stiffness, it supports a wide range of gear combinations to suit the fastest downhill section and the steepest mountain pass. The crank arm is redesigned to provide your bike with a fine aesthetic upgrade.features  speed 11 speed  bolt circle diameter 110mm  chain line 43.5mm  axle diameter 24mm for use with all hollowtech ii bottom brackets  chainrings included yes    bottom bracket included no  4 arm design for a stiff, lightweight performance  hollowtech ii construction  hollowglide chainrings     11 speed compatible  same bolt circle diameter for compact and traditional double chainsets means that one crankarm fits all chainring sizes    weight 690g 59 39t, 681g 52 36t, 674g 50 34t, 668g 46 36tmanufacturer's reference codesgrey 110mm 46.36t 165mm fcr8000a66 grey 110mm 46.36t 170mm fcr8000c66 grey 110mm 46.36t 172.5mm fcr8000d66 grey 110mm 46.36t 175mm fcr8000e66 grey 110mm 50.34t 165mm fcr8000a04 grey 110mm 50.34t 170mm fcr8000c04 grey 110mm 50.34t 172.5mm fcr8000d04 grey 110mm 50.34t 175mm fcr8000e04 grey 110mm 52.36t 165mm fcr8000a26 grey 110mm 52.36t 170mm fcr8000c26 grey 110mm 52.36t 172.5mm fcr8000d26 grey 110mm 52.36t 175mm fcr8000e26 grey 110mm 53.39t 165mm fcr8000a39 grey 110mm 53.39t 170mm fcr8000c39 grey 110mm 53.39t 172.5mm fcr8000d39 grey 110mm 53.39t 175mm fcr8000e39a 2 year warranty is offered with all shimano products from chain reaction cycles 3 years on dura ace and xtr products.buy shimano components from chain reaction cycles, the world's largest online bike store.