Shimano XT 9-Speed Chain - $38.66

The Ultegra HG-93 chain features super-narrow 9-speed construction, allowing for the use of a 9-speed cassette of the same overall width as 8-speed. Its ultra-precision construction helps maintain strength, dependability, and shifting performance on the narrower 9-speed sprockets. You also get superior durability, with pin pull-out resistance increased by 50% in comparison to 8-speed. - $38.66