Crankset. Teeth: 39-53. Arm length: 175 mm. This race inspired group is super fast, reliable, and above all… smooth. The most anticipated and crown jewel of the new 11-speed group is the Ultegra 6800 Crankset. The special 4 arm spider design allows chain rings to be offered in standard double, compact double, and cyclocross specific 36/46T options - all on the same crank. Possibly the best part of the new Ultegra 6800 crankset is that the 4 arm design enables cross compatibility with Dura Ace 9000. You can now mix and match components depending on your price point and intentions. For example, maybe you own a Dura Ace 9000 standard double for criteriums, but you'd perfer a compact double for that upcoming climbing-intensive century. No need to empty your savings on another Dura Ace 9000 crankset, the Ultegra 6800 crankset is here to rescue your wallet. As an added bonus, The new 6800 crankset is 26 grams lighter than the previous Ultegra 6700 crankset!