Many in the bike world upgrade not so much when a new part debuts, but when an old part dies. We envision the Shimano Ultegra SL Rear Derailleur as being a popular upgrade item. Parts break, parts wear out. The SL rear derailleur is 9 grams lighter than standard Ultegra, and works with any 10-speed Shimano STI lever. The metal is a higher grade than the old Ultegra, and if you take the part and turn it upside down and backward, you can see where they thinned the component material without sacrificing strength.

The Shimano Ultegra SL rear derailleur is a clear beneficiary of trickle-down technology from Dura-Ace 10-Speed. Its Wide Link design gives it lightness and extraordinary rigidity to shift under serious loads. And one nice bonus in terms of keeping your drivetrain quiet & smooth-shifting is that it comes with 11t sealed jockey wheels. The finish is Ice Grey. It tips the scales at 200g. MSRP $109.99