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Get a perfect shifting, truly wide range, Shimano 1×11 setup, with the OneUp 45T expander sprocket and narrow wide chainring.
The 45T upgrade increases the stock Shimano 11 speed 11-40 cassette range by 12.5%. The 45T provides more total cassette range, it’s not just an easier granny gear. Adding the OneUp 45T sprocket lets you increase your 1×11 front chainring from a 30 to 34T without losing any low range. Eliminate dropped chains forever with our true Narrow Wide chainring design.
Cassette Zones
The OneUp 45T tunes the cassette progression into two distinct zones optimized for climbing and descending.
Climbing
(21-45T) 13-15% cassette progression. Smaller jumps to maintain an optimum even climbing cadence.
Descending (11-18T) 15-20% cassette progression. Larger jumps to reduce double tap shifting and provide faster burst acceleration when mainly pumping not spinning down trails.
2×11 Conversion
Shimano XT/XTR equipped bikes are spec’d with 11-40 cassettes. This is because Shimano 11 speed mtb rear derailleurs do not have the capacity needed to run 2×11 with an extended 11-42, (or 11-45) cassette.
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