The CUBE Reaction SLX builds on a proven hardtail platform with carefully chosen upgrades that make a real difference on the trail. A lightweight aluminium frame with modern trail geometry provides a confident, efficient ride, while the RockShox Judy Silver air fork delivers 100mm of smooth, easily adjustable travel to keep the front end composed over roots, rocks and rough ground. With clearance for wide tyres and a dropper-ready frame, the Reaction SLX is designed to adapt as your riding progresses.

At the heart of the build is Shimano’s XT 1x12 drivetrain, offering precise, reliable shifting and a wide gear range that makes light work of steep climbs and fast transitions. Powerful Shimano XT hydraulic disc brakes provide progressive, confidence-inspiring stopping power, helping you ride faster and with more control. Fast-rolling Schwalbe Racing Ralph 2.25in tyres balance grip and efficiency, while practical features like internal cable routing, mudguard and carrier mounts make the Reaction SLX a versatile hardtail for trail rides, commuting or longer adventures.

Key Features

• Lightweight aluminium hardtail frame with internal cable routing and dropper post compatibility
• RockShox Judy Silver air fork with 100mm travel and remote lockout
• Shimano XT 1x12 drivetrain with wide gear range
• Shimano XT hydraulic disc brakes for powerful, progressive control
• Schwalbe Racing Ralph 2.25in tyres for fast-rolling trail performance

Specifications

Frameset

• Frame: Aluminium Lite, AMF, Double Butted, Internal Cable Routing, Tapered Head Tube, Flat Mount Brake, SIC Mount, FM Kickstand Mount
• Fork: RockShox Judy Silver TK AIR, 100mm travel, PopLoc
• Headset: CUBE FPH868, semi-integrated

Wheelset

• Rims: CUBE EX25, 32H, disc, tubeless ready
• Front hub: Shimano HB-QC300, QR, Centerlock
• Rear hub: Shimano FH-QC500-MS, QR, Centerlock

Tyres

• Tyres: Schwalbe Racing Ralph, Addix Performance, Kevlar, 2.25

Drivetrain

• Rear derailleur: Shimano XT RD-M8100-SGS, ShadowPlus, 12-Speed
• Shifters: Shimano XT SL-M8100-IR, Direct Attach
• Bottom bracket: Prowheel BSA PW-MB68
• Crankset: Shimano FC-MT611, 32T, Boost
• Cassette: Shimano Deore CS-M6100, 10-51T
• Chain: KMC X12
• Number of gears: 12

Brakes

• Brake: Shimano XT BR-M8100, hydraulic disc brakes (160/180)

Finishing Kit

• Stem: CUBE Performance CPS-Race
• Handlebar: CUBE Rise Trail Bar, 680mm
• Grips: ACID Icon
• Saddle: ACID Venec Lite
• Seatpost: CUBE Performance Post, 27.2mm
• Seatpost clamp: CUBE Varioclose, 31.8mm

Cube Reaction Sizing

	XS	S	M	L	XL	XXL
Rider Height (cm)	148 - 158	158 - 168	168 - 178	178 - 185	185 - 193	193 - 198
Rider Height (in)	4'10 - 5'2	5'2 - 5'6	5'6 - 5'10	5'10 - 6'1	6'1 - 6'4	6'4 - 6'6