Rotwild X+ FS 27.5 Evo

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Rotwild X+ FS 27.5 EVO

Rotwild have leapt ahead of the competition again:  Building on the success of 2015’s Q1+ , for 2016 they’ve introduced adjustable frame geometry enabling you to tune the X+ for the challenge ahead – reduce its steering head angle and move the rear wheel back for high speed stability, or decrease the head-stock angle and shorten the wheelbase to optimize handling for slower technical courses. The X+ can also accommodate fatter 27 Plus tyres for maximum traction.  Rotwild’s X1+ EVO model is the eMTB for all occasions, making no compromise up or down hill, nothing else comes close.

If you’d like a test-ride please email or telephone our London,  Suffolk or Midlands branches.


For a larger image please see bottom of this page.


Motor Power
Battery Location
In frame
< 90
Battery Chemistry
and Capacity

Li-Ion, 518 Wh
(36 Volt x 14.4Ah)

518 36 14.4

Electric bike frame size guide

Inside leg range Frame size
24 - 29" (61 - 74cm) 14" (35.56cm)
25 - 30" (64 - 76cm) 15" (38.1cm)
26 - 31" (66 - 78cm) 16" (40.64cm)
27 - 32" (69 - 81cm) 17" (43.18cm)
28 - 33" (71 - 84cm) 18" (45.72cm)
29 - 34" (74 - 86cm) 19" (48.26cm)
30 - 35" (76 - 88cm) 20" (50.8cm)
31 - 35" (79 - 88cm) 21" (53.34cm)
32 - 37" (81 - 94cm) 22" (55.88cm)
33 - 37" (84 - 94cm) 23" (58.42cm)

Rotwild logo


Rotwild X+ FS 27.5 EVO

The Rotwild X+ EVO electric mountain bike has been designed for ultimate off-road performance. Building on the huge success of their 2015 Q1+ model, for 2016 Rotwild have introduced a raft of new developments to complement their lightweight aluminium-carbon composite monocoque frame and 90Nm BROSE e-bike motor. The result is simply astonishing: a 35% higher power to weight ratio than its nearest competitor; adjustable steering head angle; adjustable wheel-base; greater ground clearance and much greater range.

Rotwild eMTB Xplus fs Evo electric mountain bike


Winner of the International Design & Innovation Award 2016:

Earlier this year Rotwild’s X+ electric mountain bike won the prestigious International Design and Innovation Award. A 40 member team of experts judged it an  outstanding bike and a major step forward in electric mountain biking.

Rotwild win international design award 2016

For 14 days a panel of international journalists, designers, engineers, World Cup racers and marketing experts analyzed and tested the ROTWILD e- MTB R.X + FS 27.5 against over 100 of the best available products in the bike industry. The Jury’s view:

“ROTWILD’s R.X + is an exceptional bike whose potent rear triangle with 140 mm chassis and Plus tyres provides excelent riding performance. By default it comes with normal tires, but we recommend the use of Plus tires: The gain in traction and riding safety is immense! Coupled with the high capacity of 518 Wh battery and the potent Fox chassis nothing can compete with this electric mountain bike.”

The Rotwild X+ EVO is stronger – its uni-directional Carbon Fibre / 6066 T6 Alloy monocoque frame make for the most rigid e-bike frame in the world.

The most distinctive feature of the new Rotwild hybrid mountain bike is the Integrated Power Unit (IPU). This part of the bike combines the magnesium motor casing with the carbon composite battery pack to form a rigid structural element, connecting bottom bracket to head stock like they’ve never been connected before. This state-of-the-art engineering never usually gets beyond the perimeter fence of a McLaren or Williams Formula One R&D centre. It makes the Rotwild the stiffest electric mountain bike in the world; it won’t twist, buckle, or bend no matter how hard you’re riding it, no matter high you’re jumping it. Unbeatable.

Rotwild electric moutain bikes 2

Rotwilds are lighter – the X+ EVO weighs in at just 19.6 Kg, 11% lighter than its nearest rival.

Despite having lower power batteries, the X+’s nearest rivals are much heavier: , the Haibike Bosch CX AMT Pro is 21.9Kg, and the Haibike Bosch Performance weighs in at 22.2 Kg.

How have Rotwild achieved this feat? The secret is in engineering nous and use of the very latest materials and production technology: The IPU bottom tube battery housing is built up using multiple uni-directional pre-impregnated carbon fiber layers of precisely defined weights, each carefully orientated to follow the load-paths generated from the hardest riding. Thickness of the carbon bottom tube is varied throughout its section – not to thin, not too thick – but just the right number of layers to achieve the maximum possible rigidity and lowest possible weight.

rotwild integrated power unit red 1The IPU is formed and bonded to other fame components using the high-precision ‘closed-mold’ process (other frame makers use inferior ‘open-mold’ or ‘vac-bag’ processes). This requires over 70 individual molds to make Rotwild’s three carbon/aluminium frame types. It works: these material and process choices have delivered successes on the toughest race courses, and demonstrated clear performance advantages at the pinnacle of international competitions. Trophies galore at the Olympics Games and victory in the XC World Championships attest to the capabilities of Rotwild bikes.

Aluminium elements of the frame are equally exceptional; formed from 6066 alloy heat treated to Condition T6, this aluminum alloy is stronger and lighter than the standard 7020 T6 used by most MTB makers. It’s improved characteristics are significantly higher tensile strength (around 30%), and much greater resistance against bending, compression, and shear loads (around 40% greater).

In short, if you choose a Rotwild X+ you won’t be sending your frame back to us in two years riddled with fatigue fractures (this is a big problem with other popular eMTBs), but even if you did, it’d be 11% cheaper to post than any other electric mountain bike!

The Rotwild X+ EVO is more powerful – with a whopping 90Nm on tap it has a 20% power advantage over its nearest rival.

Rotwild electric bike motorThe beating heart of a Rotwild is the peerless BROSE 2.0 Drive Unit. For 2016 the Brose has new software giving more low-speed torque and smoother power delivery across all speed ranges. Its main ingredients are aluminum, magnesium, experience, enthusiasm and …helical epicyclic gears: in just designed in Germany, its made there too. 

Where other well known e-bike motors are built to a price point, the Brose 2.0 is designed and manufactured to a quality standard, incorporating precision engineered helical epicyclic gears. These are much more expensive to manufacture but offer dramatic performance and wear rate improvements over the cheaper spur gear tooth profiles that the completion use.

In the simplest terms spur gears transfer power from the driving gear to the driven gear via only one or two teeth at a time, whereas with helical gears power is transferred by three connecting teeth at a time. This results in less wear, less noise, less friction and a smaller and lighter drive unit.

Rotwild’s main rivals use either a Yamaha or Bosch motor – these are not only heavier and bulkier than the BROSE motor – for example on the Bosch unit there’s no space for a 2nd chainwheel – but they are also considerably weaker: Torque for Bosch CX unit is 75Nm and for the Bosch Performance motor its only 60Nm. The table below show the impact this has on all-important Power to Weight Ratios –  X+’s Power to Weight ratio is 35% higher than its closest rival.


Despite its small physical size the BROSE 2.0 produces a market leading 90 newton meters of torque. It does this quietly, reliably and without fuss. The company’s sensor concept is the only one of its kind on the market today: it measures rider pedal force no fewer than 420 times a second, delivering smooth, vibration free assistance. Production began in July 2014 and by August last year the Rotwild/Brose test team had covered 69’445 miles of Brose e-bike motor shaftarduous Alpine trails.

Brose Drive Technology is a division of the Brose Group, one of the most innovative and successful suppliers to the international automotive industry, employing some 22,000 employees – 2,500 of them engineers – at 57 locations in 23 countries around the world. Their annual turnover exceeds €5 billion. Last year Brose manufactured 100 million electric motors. They know what they’re doing.

Decades of experience specialising in mechatronic systems for the automotive sector mean they’re perfectly placed to produce this innovative e-bike drive unit. Development and production of the Brose e-bike motor is carried out entirely in-house at their Berlin engine plant, where a dedicated team of engineers design, build and test the system at their purpose built e-bike centre of excellence .


How do they compare?

Rotwild logo  Brose electric bike motor logo small  Haibike xDuro AMT Pro CX Haibike xDuro AMT Pro Performance
Power: 90Nm 75 Nm 60 Nm
Weight: 19.6 Kg 21.9 Kg 22.2 Kg
Power to Weight Ratio: 4.59 Nm/Kg 3.42 Nm/Kg 2.7 Nm/Kg
Frame Geometry: Adjustable Fixed Fixed
 Battery Capacity: 518 Watt Hours 500 Watt Hours 400 Watt Hours
Charge Time: 50% 1 Hr, 100% 2.5 Hrs 50% 2 Hrs, 100% 4.5 Hrs 50% 2 Hrs, 100% 4.5 Hrs
 Range: Excellent Poor  Poor
Price: £ 5’449 £ 5’900 £ 5’499


Compared to its competitors ROTWILD electric mountain bikes have much greater ground clearance (Red = Haibike):

Rotwild compared to Haibike


The Rotwild X+ EVO goes further than the rest –  at least 30% further than its nearest rival.

The Li-Ion battery is integrated into the carbon fibre bottom tube, ensuring the lowest possible centre of gravity, and at 518Wh the battery will drive you further than other electric MTB in it’s class. It’s not just me! Many of our Rotwild customers have had first hand experience of the Brose’s efficiency – of course the range between re-charges on a Rotwild is greater than any of its competitors because it has a higher capacity battery, but that does not explain how a Rotwild with 20% more power than its rivals can run flat out at Cannock Chase from 11am to 6pm, stopping only for a coffee in the morning and a single pint in the afternoon on one charge. Clearly, most of the range advantage is down to the efficiency of the Brose drive unit. 

Fully Adjustable Frame Geometry:

Many serious off-roaders will own at least two bikes, one for tight technical work, another for higher speed work. Thanks to its adjustable frame geometry the 2016 X+ can do both jobs:The Rotwild X+ enables you to quickly adjust chainstay length from 422mm to 435mm.Wheelbase adjustment occurs in the horizontal plane only, this means that important geometrical dimensions such as height of bottom bracket, seat post and head tube angle remain unchanged. This feature also enables wheel sizes of 27.5” and 27+ to be used, accommodating 27+ tyres with a width of 2.8” to 3.0″.

Dynamic influences of chainstay lengths on ride :

Moving the rear axel to the forward position gives a very short chainstay length of 422 mm resulting in better manoeuvrability, more precise cornering, and making it easier to lift the front wheel overcome obstacles.

Rotwild adjustable rear wheel

Moving the rear axel to the rearward position gives a chainstay length of 435 mm. This provides greater riding stability on fast descents and reduces the tendency of the front wheel to lift on steeper climbs. In this position the frame can take a tyre width of up to 3.0” (27+).

Rotwild adjustable rear wheelbase


Rotwild X+ drop-outs allow you to adjust ride height to compensate for bigger 27 PLUS tyres.

Rotwild frame 3-4

Beautifully engineerd, strong, and ample room for 27 PLUS tyres

Rotwild suspension bearings

Rotwild’s precision suspension bearings are corrosion resistant.



Rotwild headset

Rotwild X+ interchangeable headsets allow you to vary steering head angle.


Rotwild electric mountan bike power selector and display

Rotwild have ditched the damage prone big central displays that other brands use, for 2016 they’ve introduced a small left hand bar mounted LCD/SWITCH. Better by far.



DÄMPER XCS – ALL MOUNTAIN Rear Suspension system / Travel 145mm
FORK FOX 34 FLOAT 140mm 27.5+ FIT4 LSC FACTORY KASHIMA Forks. Adjustable CTD
WHEELSET DT SWISS M1700 / XM 481 (27+) 15/12 TAS

Specifications correct at product launch date and may vary during production year.


frame geometry diagram S M L  XL
A SEAT TUBE LENGTH (mm) 435 440 475 510
B TOP TUBE LENGTH (mm) 590 595 610 635
C HEAD TUBE LENGTH (mm) 110 110 120 130
D CHAIN STAY LENGTH (mm) 445 / 457,5 445 / 457,5 445 / 457,5 445 / 457,5
F HEAD TUBE ANGLE ( ° ) 67,0 67,0 67,0 67,0
G SEAT TUBE ANGLE ( ° ) 73,0
H WHEEL BASE (mm) 1.157 1.163 1.194 1.223
I STANDOVER (mm) 746 751 765 773
J REACH (mm) 417 423 450 475
K STACK (mm) 600 600 610 619

MTB legend Richie Schley shows how to do it on a ROTWILD:

Here are some videos ROTWILD have produced to show how their electric bike technology works, and how it beats the competition:

Here are some videos showing the partnership between Mercedes-AMG and ROTWILD:

And finally, here are some of the clever folk that make and ride ROTWILD MTBs:

Rotwild makers and riders

Please use the horizontal slider at the bottom of your browser to view the image below.



Rotwild eMTB Xplus fs Evo


All of our electric bikes are fully assembled, checked and road-tested by our expert staff prior to delivery.

High quality electric bikes last for many years so it’s important you get the one that’s right for you – but there are so many to chose from! Online research can help you narrow the options but by far the best way to ensure you’re making the right choice is to visit one of our branches, discuss you needs with one of our friendly experts, and test-ride one or all of the many brands and models we stock – there’s no substitute for spending time in the saddle!  Once you’ve made your choice you can ride your new e-bike away. Don’t worry if you can’t spare the time or are just too far from one of our shops, we’ll be happy to help you choose over the phone or via email and deliver your e-bike to your home at a time that best suits you.

▶ Personal Home Delivery

no brown box delivery1

If you choose this option our experienced staff will deliver your electric bike in person to your door fully assembled and tested at a pre-arranged time, and will work with you to ensure every thing is perfectly adjusted to suit your size and preferred riding style before that all-important test ride. We’ll spend time with you to make sure you’re happy with your choice and understand all its features, so be ready to put the kettle on!

After your test ride, when everything has been fine-tuned to your liking and you are comfortable with your e-bike we will fit any accessories you may have ordered – or those you might already have – a favourite old saddle perhaps, a particular bell, or pair of trusted hand-me-down panniers.

Only when we are certain you are completely confident in your e-bike choice and understand how everything works will we leave you to enjoy your new found freedom.

The cost of this personal service varies depending on your location and whether you would prefer evening or weekend delivery, please email or telephone us for an estimate.

Note: After you have inspected the bike, found it to be in good working order, and agreed that this is the right bike for you, the sale will be complete. If we have delivered in person please be sure you are happy with everything before we leave as we cannot accept returns once our delivery staff have driven away unless the e-bike can been shown to have a design or manufacturing fault. We then retain the right to determine the appropriate remedy, be that on-site repair or replacement of a part, a replacement electric bike, or full or partial refund. If the reason you decide not to accept the bike could have been established easily before you ordered it (e.g. you ordered a white bike and later decided you prefer black), we reserve the right to make reasonable charges for delivery and or any work done to the bike prior to delivery.

▶ Evening and weekend delivery:

Because few of us are at home during working hours these days, we offer the option of our personal home delivery service on Saturdays and Sundays, and evenings during the week.

The cost of this personal service varies depending on your location and whether you would prefer evening or weekend delivery, please email or telephone us for an estimate.

▶ Courier Delivery

Before being delivered via courier your e-bike will be fully assembled and road tested. Once we’re happy with all aspects of its performance we will carefully pack it in a sturdy box ready for shipping.  Please note that the pedals are removed and handlebar rotated inline with the frame for packing so these will need to be fitted and adjusted on arrival. This is simple to do but should you like reassurance we will happily talk you through the process over the phone, we can also arrange a phone-call with your local, trusted bike mechanic if you decide you would rather give the job to them.


Telephone: 01728 830 817 (Suffolk), 0208 960 9848 (London), 0116 3666 980 (Midlands)


no brown box delivery1


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Spread Payments With Our Affordable Finance Offers

Product price £5,199.00
£ Deposit £100.00
12 Monthly payments at £436.02
Total payable £5,332.24

If you would like to use our finance facility please select the e-bike of your choice and add it to your basket. You can choose the finance option that best suits your needs when you check-out.