Oneup components shimano xtrxt expander sprocketupgrade your shimano 11 speed drivetrain with the new 45t sprocket for xtxtr m8000m9000 cassettes the 45t upgrade increases the stock shimano 11 speed 11 40 cassette range by 12 5 and provides more total cassette range adding the oneup 45t sprocket lets you increase your 1x11 front chainring from a 30 to 34t without losing any low range eliminate dropped chains forever with oneups narrow wide chainring design the oneup 45t tunes the casset