The Shimano 1×10 Expander Sprocket Kit from One Up Components is an incredibly easy-to-fit pair of sprockets that replace two of the stock cogs to give you 90 percent of the benefit of a 1X11 system but at 10 percent of the cost. The larger cog fits behind most 11-36T cassettes, displacing one from the main cluster. The 16T sprocket provides even more cassette progression for smoother cadence and improved shifting. These cogs feature 12 upshift optimized points and uses the original 28/32/36T steel sprockets for maximum durability. Available in Black or Green.