Shimano Deore XT M770 Chainrings
For riders looking for the best shifting chainrings available, you can't go past Shimano. Being the first brand to bring in ramped and pinned chainrings, the white lab coat guys at Shimano know a thing or two about giving you the fastest shifting drivetrain available.
 
Part of Shimano's  "HyperDrive" concept, the chainrings utilise SG-X technology for super smooth gear changes when combined with a Shimano front derailleur and chain. They are still compatible with other brands of chains and derailleurs, but for the best results use a Shimano HG chain and front derailleur. The outer Deore XT chainring features an all alloy construction that is machined, rather than stamped. Compared to the cheaper SLX chainring, the XT uses wider mounting plates that improve the cranks stiffness and shifting under load. The beefy chainring features much more machining than the SLX outer ring, though weight does not increase due to the removal of excess material. As a result, the shifting is faster than the SLX and responds better under compromised conditions. For experienced riders looking for every advantage possible, the difference is well worth the upgrade. 
 
Note: If you own the XT M770 crankset, Shimano recommends replacing the chainrings with genuine Shimano products due to the specific width of the mounting points. Other branded chainrings will fit, but the chainline will be different and front shifting will be compromised.
 
The Shimano Deore XT Outer Chainring Features: