OneUp Components 45T Extended Cassette Sprocket Plus 18T Cog Combo

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Increase the range of your Shimano XT/XTR Cassette by 12.5% by adding this OneUp 45T sprocket. It converts your Shimano 11 speed cassette from 11-40T, to 11-45T, which means you can increase your front chainring from a 30 to a 34T and increase your top speed without losing any of the lower range. The included 18T sprocket is designed to smooth the shifting across the cassette (by replacing the 17T and 19T sprockets) when using the 45T sprocket. 


The end result is a Shimano 11 Speed cassette that is structured in two zones - climbing and descending. Climbing, you'll use the 21-45T range, which uses smaller jumps to maintain an even climbing cadence. Descending (11-18T) includes larger jumps than standard, which provides faster burst of acceleration, perfect for off-road.




  • Cassette progression:  11-13-15-18-21-24-27-31-35-40-45
  • Sprocket material:   7075-T6 Aluminum (45T), Nickel plated hardened steel (18T)
  • Sprocket weight: 65g more than stock 11-40 cassette
  • Compatibility: For XT/XTR M8000/M9000 11-40T cassettes. 11 Speed only. Standard freehub driver.
  • Cassette range improvement:  12.5%
  • Color: Matched to XTR



Mount the OneUp 45T first and reinstall all sprockets except the stock 17T and 19T sprockets (these are replaced with the OneUp 18T and aluminum spacer). Due to the large pulley wheel offset of the latest 11 speed Shimano rear derailleurs, B-Screw adjustment is well within the normal operating range and chain wrap is excellent throughout the cassette for flawless wide range shifting. The conversion keeps the 40T as the smallest aluminum sprocket for maximum cassette durability. 


Brand OneUp Components