OneUp Components

Increases the gear range of Shimano’s new XT and XTR 1x11 groupset with a 45t cassette sprocket

OneUp has just launched a 45t cassette upgrade kit for Shimano’s new 11-speed XT and XTR groupsets, offering a wide gear ratio setup to rival SRAM’s popular 1x11 groupset.

SRAM has had runaway success with its 1x11 groupsets for the past few years, which ditch the front mech and double chainring for a single ring with a huge 10-42t cassette, providing a massive range of gear ratios.

Shimano finally offered a 1x11 drivetrain with its recently launched new XT and XTR (double and triple chainsets also available) but with an 11-40t cassette, it’s not a direct match for SRAM’s offering. The new OneUp kit replaces the stock Shimano 40t sprocket with a 45t sprocket, and the 17 and 19 sprockets with an 18, and increases the gear range by 12.5%. The new cassette setup would look like this: 11-13-15-18-21-24-27-31-35-40-45.

The company claims the Shimano rear mech copes just fine with the increased sprocket size, with enough chain wrap for flawless shifting. The upgrade kit costs $90 (we don’t have a UK price) and includes a 7075-T6 aluminium 45t sprocket and a nickel plated hardened steel 18t sprocket, colour matched to the XTR sprockets. OneUp says there’s a small 65g weight penalty.

The OneUp 45t upgrade kit will be available from 18th May.