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Cube Reaction Hybrid Race 625 2021 Bosch

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Who is this bike suitable for?

Building on the success of last years Cube Reaction Hybrid and with a higher level of spec than the Performance and Pro models, the 2021 Cube Reaction Hybrid Race is the hard tail can build confidence in new riders, while still providing seasoned riders with a rewarding platform to really hit the trails with everything they have. 

Sadly, this popular bike is now sold out but you can find the 2022 version here

I was skeptical I could ascend a local very steep hill sitting down but I did and in torrentially wet conditions. The ability to have traction and ‘accelerate’ through hairpin bends whilst ascending is unique, as is the lower center of gravity which feel much safer and more controlled on steeper descents. All in all it is an amazing piece of kit.

New Features

With the latest Generation 4 Bosch Performance CX drive system, a 625Wh battery and a newly increased 85Nm of torque the Cube Reaction Hybrid Race 625 is ready to take you much further and faster in 2021. 

Along with the rest of the Reaction line-up, its equipped with Schwalbe's 2.6" Smart Sam Active tyres. The new Reaction Hybrid Race is set up perfectly for riders who find themselves frequently switching between tarmac and dirt and they perform effortlessly on both. 

The innermost section features a continual tread band for low rolling resistance on tarmac, while the shoulders of the tyre have wider spacing and more aggressive tread to optimise off road grip during cornering and braking. 

With the larger volume of Plus size tyres, they can be run at higher pressures for faster rolling and lower resistance on-road, or alternatively at lower pressures for comfort and a wider footprint to improve grip when off-road.

Smart Sam tires on Cube Reaction Pro 500 2019

New for 2021, Cube are fitting the Race variant of the Reaction Hybrid with the latest 100mm Rockshox Judy TK Air forks. Taking many of its design ques from the award winning Pike series, they're adjustable for rider weight, giving an almost infinite level of adjustment to maintain ground contact. 

The 2021 Reaction Hybrid Race 625 comes with Shimano's MT420 hydraulic disc brakes. Despite their super low weight, they offer solid performance from the 4 piston setup with easy reach adjustment. This new Race model comes with 203mm front and 180mm rear brake rotors. 

Shimano MT200 Brakes on Cube Reaction Pro 500 2019

With 4 piston calipers and a great range of adjustability, you can be confident that the Shimano M420 brake system will bring you to a stop just as quickly as this bike takes off!

As well as providing incredible braking force, hydraulic brakes are incredibly reliable and require almost no maintenance aside from an occasional brake pad change. 

Cube have used their own 29" EX30 factory rims onto the Reaction Hybrid Race for 2021 with Shimano boost hubs.. These 30mm wide rims offer riders the ability to fit an ever increasing choice of wider tyres to suit their riding style. 

The wider Shimano boost hubs improve bracing angles for the wheels spokes helping to improve wheel strength and stiffness.

Cube have designed the Reaction Hybrid Race 625 to be thoroughly up to date for 2021, with internal routing for all cables including the option for a stealth dropper post. The Bosch PowerTube 625Wh battery has been mounted inside the frame to further protect it and enhance the frame aesthetics.

The 2021 Cube Reaction Hybrid Race 625 eBike is equipped with Shimano's new XT M8100 12-speed rear derailleur. 

The Shimano XT M8100 setup along with 10-51t Deore M6100 cassette offer an incredibly wide ratio gearing, allowing you to take on even the most severe of inclines, while not compromising top speed on flat ground. 

The M8100 derailleur features Shimano's Shadow Plus one way friction operated clutch to reduce unwanted chain movement, helping to keep things both quiet and efficient over rougher terrain.

Shimano Deore on Cube Reaction Pro 500 2019

The 2021 Cube Reaction Hybrid Race 625 with its upgraded spec over the rest of the Cube Reaction line-up is a bike in a class of its own at its price point. It's combined specification, performance and value against it competitors in the 2021 model year will make them highly popular on the XC trails. 

2019 Bosch Performance Cx System on Cube eBikes

Bosch CX & Purion eBike System

The new Cube Reaction Hybrid Race 625 2021 eBike features the latest Gen 4 Bosch Performance CX motor.

The 250w Generation 4 CX system provides 85Nm of torque & peaks at 500w! It packs a serious punch, offering up to 340% assistance in turbo mode. Featuring 4 levels of assistance, eMTB mode (also newly updated for 2021) allows the user to set off in one assistance mode and the system itself will determine the assistance offered. 

The Cube Reaction Hybrid Race 625 features the latest and largest capacity Bosch 625Wh battery technology for 2021 and is located inside the down tube for security and to improve frame aesthetics. 

As with previous generations, Cube have equipped the Bosch Purion display, a revised smaller dash that offers quick vision of essential parameters whilst occupying a minimal amount of cockpit space and not distracting attention.

Read more in depth articles about the Bosch eBike system on our Blog information pages.

Whats included?


This electric bike comes fully set-up by our workshop technicians. You can be sure that every aspect of the eBike has been dialled in for optimum performance. All our electric bikes arrive with a user manual, keys, charger & free follow up service within 3 months.

Warranty support on the Cube Reaction Hybrid Pro 500 2019

Our electric bikes also include a 5yr warranty on the frame, 2yr warranty on all the electrics & 1yr warranty on the components. In the event of a problem, we handle all warranty claims in-house. We can also offer worldwide support for customers further afield using a laptop or PC connected to the internet, combined with our diagnostic equipment.

E-bikeshop is a UK Bosch Electric Bike Service Center and our in house workshop is now exclusively reserved for our own eBike customers. We also have parts / spares to hand should they be required.

*Range is dependant on many factors inc rider weight, wind, hills, terrain etc. For a better estimate, please use our range calculator. 

*Pre-Order Terms: Reservations are final, deposits non-refundable & provided on a first come served, queued basis. Dates are predicted productions times and with all manufacturing dates can move back and forth. Specifications can change and images are artists impressions.

Free Electric Bike Insurance Cover

FREE 14 Days Electric Bike Cover

We've exclusively teamed up with Bikmo to offer 14 days free electric bike insurance when you purchase your new electric bike with

You'll be covered for eBike theft, accessories, crash damage, clothing/headgear, accidental damage, public liability and Bikmo will even cover the cost of getting you home as a result of damage or theft.

The perfect package to get you started with your new eBike without the need for any worry or hassle. Of course, you'll have the no obligation option to continue your insurance over after the initial period.

To get this exclusive special offer, simply tick the checkbox in the checkout. 

*You must meet all of the standard Bikmo eligibility criteria and understand the Bikmo locking requirements. You can find this info on the dedicated page here

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General Bike Specifications


Cube Aluminium Superlite Frame


RockShox Judy Silver TK Air, 100mm, Lockout


Shimano BR-MT420 / MT400 hydraulic disc brakes, 203/180mm Rotors


Shimano Deore SL-M6100, Rapidfire-Plus

Rear Mech

Shimano XT RD-M8100-SGS, ShadowPlus, 12 speed


Shimano Deore CS-M6100, 10-51T


Shimano CN-M6100


Cube EX30 29" Rims laced on Shimano Centerlock boost hubs


Schwalbe Smart Sam, Active, 2.60"


Cube Rise Trail Bar, 720mm


Cube Performance Stem E-MTB, 31.8mm




Cube Performance Post, 30.9mm


Natural Fit Sequence


23.4 kg

Electric Bike Specifications


Bosch PowerTube Lithium Ionen 36 Volt, 625Wh, with BMS Management


Bosch Purion Display


Bosch Performance CX 36 Volt, 250 Watt. 60- 340% Assist, 85Nm


30-160 miles of power assisted range, depending on terrain

Further Information


The most frequently asked questions on this eBike -

These questions relate to this bike. You can find a full F.A.Q on general eBike & website questions by clicking here.

What sizes is this bike available in?

The Cube Reaction Hybrid Race 625 2021 is available in frame sizes - 38cm (15"), 43cm (17"), 48cm (19"), 53cm (21") & 58cm (23").

Is this bike in stock now?
The stock status is shown at the top of this page next to the price. If the stock level is shown as 'Pre-Order' this means it is a new model arriving soon, you can see an expected date at the top of each bike description.

Are there any colour options?
The Cube Reaction Hybrid Race 625 2021 bike is held in stock in the colour(s) shown. However we may be able to order alternative colours on request, subject to availability. 

Where can I find a geometry chart of this bike?
You can find the geometry chart of each bike by clicking on the 'Downloads' tab of each bike.

Where is this bike made?

Can I try the bike before I buy?
Yes of course, you can visit, we can talk you through your riding style and requirements and offer expert advice as to which model to select. We will be able to advise particular eBikes and talk them through in more detail. We also give you the opportunity to ride crank drive bikes so you can get a feel for them prior to purchase. 

At e-bikeshop we work by appointment only, so we can talk to each customer on an individual basis to give the best advice possible. If you like the bike, you have the option to take it away there and then with any accessories selected fitted and a full fitting session on the bike itself. We ask you to go for a short ride on the bike to make sure you are happy with the setup and also able to answer any operational questions you may have. 

If you cannot find the answer you are looking for, please do not hesitate to get in touch.
Remember you can find a full F.A.Q on general electric bike & website questions by clicking here.

The following links will open PDF files in a new tab -


Bosch CX eBike System Overview - Bosch CX Performance System Product Brochure

Bosch eBike User Manual - Bosch eBike Performance CX User Manual

Bosch eBike Purion Display Manual - Bosch Purion Display User Manual

Cube Bike Manual - Cube Bicycle Handbook Manual

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Finance Options

The prices below do not include any additional products, product options or shipping costs.
To pay by finance select the finance option during the checkout process.
Finance is only available for UK residents.

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The above values are best estimates, Final pricing will be confirmed on the V12 Retail Finance application. The UK Electric Bike Company Ltd is registered in England and Wales 08775019. Registered office: 12 Borelli Yard, Farnham, Surrey, GU9 7NU. The UK Electric Bike Company Ltd acts as a credit broker and only offers credit products from Secure Trust Bank PLC trading as V12 Retail Finance. The UK Electric Bike Company Ltd is authorised and regulated by the Financial Conduct Authority. Our firm reference number is 659966. Credit provided subject to age and status.