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Click 'Find out more' above to calculate costs. Then simply add the bike and any products you wish to the cart and proceed through the checkout, where you can apply online and the process is automated.
We deal with all major cycle to work scheme providers. You can save up to 48.25% on the purchase of your new electric bike. We don't add on any hidden charges or fees (even on sale items).
Fast electric bike delivery subsidised to just £4.99 (for mainland UK). We also deliver to Highlands & Islands as well as the rest of the world. Simply add to cart, the shipping cost is calculated at checkout.
Every electric bike purchased from us benefits from free 30-day insurance cover from our partners at Bikmo. This covers both theft and damage. Simply opt for your free e-bike insurance cover at the cart.
Seen a bike advertised for less elsewhere, but want to purchase with all the benefits of buying from the electric bike experts? We'll do our best to match the price on a like-for-like service and product.
Want to view your dream bike, or maybe you just need a little more information or support? Why not visit our HQ where we have over 150+ electric bikes on display and one of our e-bike experts can assist.
Discover the 2027 Cube Reaction Hybrid SLX 800—the pinnacle of lightweight, high-performance electric bikes designed for riders who demand the very best. Its premium aluminium frame combines strength with featherlight agility, delivering razor-sharp handling on technical trails and fast rides.
Powered by Bosch’s 120Nm Performance Line CX motor and a massive 800Wh battery, it offers dynamic, responsive assistance that conquers steep climbs and long distances effortlessly. Equipped with a complete Shimano XT groupset, featuring cutting-edge 12-speed Di2 electronic gearing, it provides lightning-fast, flawless shifting alongside exceptionally powerful hydraulic braking in all conditions.
Featuring a premium Fox 34 AWL front suspension fork to masterfully absorb rough terrain and high-traction tyres, the SLX 800 is ready for serious trail riding or speedy commutes.
Performance, precision, and state-of-the-art Bosch technology combine seamlessly—the 2027 Reaction Hybrid SLX 800 sets the standard for e-mountain biking excellence.
Full product detailsOur 5 point review...
1
Superlight aluminium frame combines strength, agility, and daily durability.
2
Fox 34 Float AWL fork provides 120mm air travel.
3
Electronic Shimano XT Di2 12-speed drivetrain delivers flawless shifting.
4
Shimano XT 4-piston hydraulic brakes offer supreme anchor power.
5
Bosch CX Gen 5 motor generates explosive 120Nm torque.
Battery
Bosch 800Wh
Display
Bosch Kiox 500
Motor
Bosch CX Gen 5
Range
30-170 miles
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The Bosch "Gen 5" Performance CX motor launched as a 85Nm motor. Bosch periodically release updates for their drive systems, normally for reliability and performance. Recently, Bosch announced the option for an extra 35Nm of torque.
This bike will come with the latest update of 120Nm torque output already installed. This update unlocks up to 600% maximum assistance in Turbo mode. You can adjust the power back down if required by using the Bosch eBike Flow App.
The new eMTB+ riding mode delivers dynamic support at the highest level, blending the smooth control of eMTB mode with the full power of Race mode - offering up to 600% maximum support. It's available as part of this new firmware update.
Extended boost remains easy to modulate like in eMTB mode, while unleashing the full force of Race mode when needed. Up to 750 watts of power is delivered naturally and responsively, based on your pedal input. eMTB+ gives you the best of both worlds - combining agility, performance, and control for a truly natural riding experience. It is also possible to maintain peak power for longer, depending on riding conditions.
Features
The Reaction Hybrid SLX 800 represents the pinnacle of hardtail engineering, delivering unmatched value by pairing electronic shifting with flagship e-MTB technology. Built around a lightweight Superlight alloy frame, it integrates electronic Shimano XT Di2 shifting, a massive 800Wh battery, Fox 34 AWL air suspension, and four-piston XT brakes.
Aimed at demanding trail riders, tech-focused enthusiasts, and long-distance touring cyclists, this flagship hardtail offers an unbeatable spec-to-cost ratio for riders who want pro-tier precision and maximum battery range without full-suspension complexity.
The Cube Reaction Hybrid SLX 800 2027 is engineered specifically for high-speed cross-country riding, rugged gravel fire roads, and long-distance backcountry touring. Designed to master demanding off-road routes, its 120mm Fox 34 AWL e-bike fork cushions harsh trail chatter effortlessly, while the factory dropper post allows immediate position changes on steep descents.
Whether tackling technical gravel climbs, scenic mountain bridleways, or fast-flowing forest singletrack, this hardtail delivers a stiff, responsive, and comfortable riding platform built for ultimate multi-terrain exploration.
Brakes & Gears
Anchor-grade stopping capability comes from high-end Shimano XT BR-M8120 four-piston hydraulic disc brakes operating on large 203mm rotors front and rear. Renowned for supreme lever modulation, rapid thermal management, and immediate clamping force, this setup ensures fade-free consistency on long, steep off-road descents.
Whether control-checking speed on loose gravel tracks, navigating wet forest trails, or coming to an abrupt stop in traffic, riders benefit from crisp lever feedback, incredible stopping power, and complete braking confidence across all weather conditions.
Drivetrain duties are handled by an electronic 12-speed Shimano XT Di2 system featuring a wide 10-51T cassette and CN-M6100 chain. Driven by a Di2 electronic switch, the XT Di2 rear derailleur executes instantaneous, lightning-fast gear changes with digital precision under full motor load.
This broad gear spread ensures you can always maintain an optimal pedalling cadence, whether grinding up sheer vertical forest ascents or putting down maximum power along fast, flowing fire roads during long-distance mountain rides.
Shimano XT BR-M8120 four-piston hydraulic disc brakes with dual 203mm rotors deliver instantaneous, fade-free stopping power, precise lever feedback, and total anchor control down steep, loose off-road gravel descents.
The Shimano XT Di2 12-speed electronic rear derailleur offers surgical, lightning-fast gear changes, powered directly by the bike's battery to eliminate cable stretch and maintain permanent shifting accuracy.
The Shimano Deore Di2 12-speed switch provides micro-adjustable, electronic thumb actuation, delivering effortless gear shifts while preventing accidental double-shifting under heavy motor torque to preserve drivetrain components.
Wheels & Tyres
The Newmen Performance 30 wheelset features a durable, tubeless-ready rim construction engineered specifically to handle rugged trail riding and high-speed off-road touring. Built with Boost hub spacing (15x110mm front, 12x148mm rear), these wheels offer excellent lateral stiffness and efficient power transfer under heavy motor drive.
The wide 30mm internal rim width supports high-volume tyres perfectly, allowing lower inflation pressures for enhanced riding comfort, increased cornering traction, and reduced rolling resistance over rough, rocky surfaces.
Schwalbe Smart Sam Performance Kevlar 2.6-inch tyres deliver an ideal balance of off-road traction and low on-road rolling resistance across varied surfaces. Featuring a compact central tread pattern alongside grippy outer shoulder studs, they roll smoothly on tarmac while biting predictably into loose gravel, dry forest tracks, and mud.
The high-volume Kevlar casing absorbs trail chatter and small impacts, providing a comfortable ride, added puncture protection, and confident cornering stability across diverse everyday environments on every single trip.
The bottom line..
This flagship hardtail e-MTB is tailored for tech-savvy trail riders and endurance explorers who demand electronic shifting precision alongside uncompromised battery range. It caters brilliantly to fitness enthusiasts and backcountry adventurers looking to conquer ambitious long-distance routes and steep elevation gains with minimal gear effort.
With its balanced geometry, plush Fox air fork, electronic Di2 drivetrain, and huge 800Wh battery, it empowers riders to push their technical limits and explore further than ever before.
Investing in a top-spec Cube hardtail equipped with Bosch motor technology and electronic Shimano shifting gives riders an unmatched balance of premium performance and long-term value. Cube’s Superlight aluminium frames undergo rigorous stress testing to handle demanding off-road punishment, while Bosch drive systems are globally celebrated for quiet operation, bulletproof reliability, and extensive main-dealer support.
This powerful synergy means riders enjoy cutting-edge component integration, bulletproof reliability, and straightforward servicing without paying the astronomical prices typical of boutique brands.
Power
Powered by the flagship Bosch Performance Line CX Generation 5 drive unit, this e-MTB produces a massive 120Nm of torque for effortless climbing across extreme off-road gradients.
Integrated seamlessly into the frame, the 800Wh Bosch PowerTube battery features advanced BMS management, offering an impressive power-assisted range of 30 to 170 miles depending on conditions.
Cockpit control is managed by the low-profile Bosch LED Remote alongside the large, high-resolution Kiox 500 display, providing crystal-clear visibility of speed, battery status, and navigation.
The setup connects via Bluetooth to the Bosch eBike Flow app, enabling riders to customise motor support settings, track ride statistics, perform wireless software updates, and utilise turn-by-turn navigation for a fully connected, hassle-free riding experience.
The Bosch Kiox 500 display and LED Remote provide a high-resolution colour screen showing speed, battery status, and navigation for effortless handlebar control and clear trail visibility.
The Bosch Performance Line CX Generation 5 motor delivers explosive 120Nm torque and 250W power output, providing smooth pedal assistance and exceptional climbing drive across steep, technical trail terrain.
The integrated 800Wh Bosch PowerTube battery delivers high energy storage capacity with smart BMS management, providing up to 170 miles of power-assisted range for extended off-road exploration.
What's included
Your new Cube electric bike gets a full set-up by our workshop technicians ahead of delivery.
Your Cube eBike will arrive with a user manual, keys (where applicable), charger & free follow up service (at our service center) within 3 months of delivery.
Cube electric bikes include a 6yr (Alloy) or 3yr (Carbon) warranty on the frame, 2yr warranty on all the electrics and 1yr warranty on the components. In the event of a problem, we handle all warranty claims via our dedicated support in-house.
E-Bikeshop is a Cube UK eBike Service Center and our in-house workshop is exclusively reserved for our own eBike customers. We have time to support the eBikes we sell.
Specifications
General Bike Specifications
Frame Cube Aluminium Superlight Alloy
Forks Fox 34 Float AWL, 2-Position Sweep-Adjust RAIL Damper, 120mm (S: 100mm)
Brakes Shimano XT BR-M8120, Hydr. Disc Brakes, 203mm Rotors
Shifters Shimano Deore Di2 SW-M6250-IR, 12-Speed
Rear Mech Shimano XT Di2 RD-M8260-SGS, 12-Speed
Cassette Shimano Deore CS-M6100, 10-51T, 12-Speed
Chain Shimano CN-M6100, 12-Speed
Wheelset Newmen Performance 30, 15x110mm / 12x148mm, Tubeless Ready
Tyres Schwalbe Smart Sam, Performance, Kevlar, 2.6" (27.5: S / 29: M, L, XL, XXL)
Handlebars CUBE Rise Trail Bar 35
Stem CUBE Performance Stem E-MTB 35, FPI-Link
Headset ACROS AZF-1034, ICR
Seatpost CUBE Dropper Post, 31.6mm
Saddle ACID Sequence 160 Pro Bubble Foam
Weight 24.4 Kg
Electric Bike Specifications
Battery Bosch PowerTube 800Wh, with BMS Management
Display Bosch LED Remote + Kiox 500 Display
Motor Bosch Drive Unit Performance CX Gen 5 120Nm 250W
Range 30-170 miles of power assisted range, depending on terrain
Downloads
FAQs
To see the estimated monthly installments on any bike, simply click the 'Find out more' button towards the top of this page. You can select the deposit amount and loan period to quickly calculate the monthly cost before proceeding to place your order.
Finance is automatically processed online at the checkout when selected, you can learn more on our dedicated E-Bike finance page.
Some models have more available sizes than others. Whilst some bikes are only available in a 'one size fits all'.
Note: You may be a particular size on one model and a different size on another model. Please use the size calculator on each model page as sizes can vary between manufacturers and models.
You can learn how to process these by clicking on any of the links above. For more information, please visit the dedicated Cycle to Work Scheme portal.
In Stock: In stock now and available to order for immediate delivery
Pre-Order: Available to pre-order with estimated date of arrival shown
Sold Out / Out of Stock: The model is completely sold out in this variant and no longer available to order
If this bike is showing as Out of Stock in your size, it's worth checking if there's colour options as the same model and size may be available in a different colour. Failing that, we also offer a handy link to 'View similar bikes in this size'.
We will then prepare your new eBike and be in touch to book a suitable collection day/time.
One of our experts is on hand to help you set up the correct position on your new eBike along with answering any questions that you may have.
Not all of our electric bikes have colour options available.
We can talk you through your requirements, riding style and offer expert advice as to which model to select.
We generally keep over 150 eBikes built in our showroom. Note: Some models shown as 'Pre-Order' may not be in the showroom to view as the bike is still due from the supplier. We can also give you the opportunity to ride a similar electric bike so you can get a feel for how electric bikes work prior to purchase. It’s important to note we don’t have every single bike, in all sizes, colours and variants etc available for test ride.
Should you wish to purchase, we give the option to take it away that same day (subject to stock) with any extras fitted and a handover session on the bike itself by one of our eBike experts.
You can learn more on our E-Bike delivery page. International buyers can view international delivery times.
For delivery on 'Pre-Order' items, the estimated arrival date is shown at the point of order. On arrival our team will make contact to settle any outstanding balance. Once settled in full, we'll then proceed to dispatch your new eBike without delay.
This not only covers for theft, but also covers you for public liability, breakdown, accessories, accidental damage and returning home cover. You can learn more on the dedicated electric bike insurance page.
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