The Shimano CUES FD-U4000-E is a 2x9/10-speed double front derailleur built around Shimano's Side Swing design, delivering crisp, low-effort front shifts and extra tyre clearance on modern mountain and trekking bikes. It mounts to a frame's E-type tabs (without a bottom bracket plate) and is part of the durable, cross-compatible CUES LINKGLIDE family.

Highlights

• Side Swing mechanism for lower shift effort and improved tyre clearance
• 2x front double, compatible with 9- and 10-speed CUES rear drivetrains
• E-type direct mount (without bottom bracket plate) for a clean, secure fit
• Supports large chainrings up to 40T with a 14T total capacity
• Steel and aluminium construction for durability with controlled weight

Side Swing shifting

The Side Swing layout repositions the cable approach so shift force is reduced and the cage clears wider tyres. The result is smooth, positive movement between the two chainrings across a typical 36-22T or 40-26T setup.

Built for CUES

FD-U4000-E sits in Shimano's CUES tier, which unifies 9-, 10- and 11-speed components under the LINKGLIDE system for long service life and broad parts compatibility. Pair it with a CUES front shifter and a LINKGLIDE or compatible HG chain for the intended performance.

Compatibility & fit

For 2x (double) cranksets running 9- or 10-speed CUES rear drivetrains. E-type mount (without bottom bracket plate) bolting to frame direct-mount tabs. Maximum large chainring 40T; total capacity 14T. Designed for 48.8-51.8mm chainlines and 64-69 degree chainstay angles. Use with Shimano CUES front shifters (e.g. SL-U8000/U6000/U4000) and compatible chains (CN-LG500 or HG-series 11-speed).