The CUES square crankset FC-U4000-1 was designed by Shimano for Linkglide drivetrains on city, touring and mountain bikes. It is suitable for 1x9-speed, 1x10-speed and 1x11-speed gears. The special tooth profile of the chainring efficiently guides the chain even in rougher terrain and prevents it from jumping off. The size of the chainring is chosen so that it can be pedalled harmoniously and comfortably on different types of terrain. The 30 and 32-tooth versions have a chainline of 52 mm, which makes them compatible with frame over locknut dimensions of up to 148 mm. For the 40 and 42-tooth versions, the chainline is 50 mm, so only dimensions up to 142 mm are compatible. The Q-factor is 178 mm for all versions. The crank is made of aluminium and steel. The four-arm steel chainring is firmly riveted to the spider. Specifications Application: City, Touring, All Mountain Compatibility: 1x9-speed, 1x10-speed, 1x11-speed Chainring Mount: 4-arm (riveted) Technical Information Series: CUES U4000 Crank Arm Material: aluminium Chainring Material: steel Axle Material: steel Gradation: 30 tooth, 32 tooth, 40 tooth, 42 tooth Crank Arm Length: 170.0 mm, 175.0 mm Chainline: 52 mm (30 T, 32 T), 50 mm (40 T, 42 T) Q-Factor: 178 mm Compatible BSA Shell Width: 68 mm / 73 mm Recommended Bottom Bracket: BB-UN101 (not included) Recommended Chain: Linkglide (CN-LG500), HG 11-speed (e.g. CN-HG601-11) Compatibility Rear Over Locknut Dimension: Quick Release: 135 mm, 141 mm (30 T, 32 T) / 135 mm (40 T, 42 T) Thru-Axle: 142 mm, 148 mm (30 T, 32 T) / 142 mm (40 T, 42 T) Bottom Bracket: BB-UN55, BB-UN26, BB-UN101, BB-UN300 (square, 123 mm axle) Chain: CN-HG901-11, CN-HG701-11, CN-HG601-11, CN-LG500 Chain Case: 40 T and 42 T compatible Features: square crank with one chainring for city, touring and mountain bikes with Shimano Linkglide drivetrains (9-speed, 10-speed, 11-speed) excellent chain hold thanks to special tooth shape excellent power transfer for more fun rides wide ratio range for harmonious, comfortable pedalling lacquered crank arms, spider and chainring Technology: Dynamic Chain Engagement+ Dynamic Chain Engagement+ is Shimano's term for a special tooth profile of single chainrings intended for off-road use. This improves the chain hold and counteracts chain drop on rough ground. It also minimises wear and increases pedaling efficiency. Manufacturer Numbers: 170.0 mm 30 tooth: EFCU40001CA0 170.0 mm 32 tooth: EFCU40001CA2 170.0 mm 40 tooth: EFCU40001CB0X 170.0 mm 42 tooth: EFCU40001CB2X 175.0 mm 30 tooth: EFCU40001EA0 175.0 mm 32 tooth: EFCU40001EA2 175.0 mm 40 tooth: EFCU40001EB0X 175.0 mm 42 tooth: EFCU40001EB2X.