E-Stream EVO AM 4 27.5+



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With the Bulls E-Stream EVO AM 4 27.5+ nothing stands in the way of maximum trail action.  The powerful BROSE S-Drive motor makes uphill rides easy with 90Nm of torque. The result: Even more trails in the shortest time!

The 650Wh Battery is fully integrated into the downtube, for better centre of gravity and balance, and has plenty of juice to keep on pushing through on longer rides.

The RockShox chassis and the agile frame geometry of the E-Stream EVO makes descents an extreme pleasure. 150mm travel offers enough leeway and reserves for really challenging terrain.

The combination of Schwalbe Magic Mary and Nobby Nic tyres provide for unmatched grip on the trail and the required freedom of movement is ensured by the retractable dropper post. The Shimano XT 11-speed gears and Magura MT5 front and MT4 rear disc brakes add the final touches to this capable trail e-MTB.

If you’d like a test-ride please call in at our London, Leicester or Suffolk branches, or email us to arrange a date.

Brose S-Drive

With a whopping 90Nm of torque on tap it has the Brose S-Drive motor has a huge power advantage over its rivals.

The beating heart of this BULLS is the peerless BROSE S-Drive. For 2018 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! All Brose motors are designed and manufactured in Germany.

Where other well known e-bike motors are built to a price point, the Brose S-Drive 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 competition 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.

Despite its small physical size the BROSE S-Drive 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 this year the Rotwild/Brose test team had covered 69’445 miles ofBrose 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 Brosemanufactured 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 center of excellence.

To find out more about the Brose S-Drive and their other models visit the official website.


Motor manufacturerBrose
Motor typeMiddle motor
Torque250 Watt
Assistance speedup to 25 km/h
Power packBMZ
Power typeLithium Ionen
Battery voltage37 V
Battery capacity (Ah)17,5 Ah
Battery capacity (Wh)650 Wh
Charging time 100%ca. 5 hrs
Charging time 50%ca. 2,1 hrs
FrameAluminium 7005 Tig welding, internal cable routing, tapered steerer
Frame size41 cm, 44 cm, 49 cm, 54 cm
Wheel size27,5+ inch
ForkRock Shox Lyrik RC Solo Air
Travel150 mm
Rear ShockRock Shox Deluxe RT
Rear travel150 mm
Rear derailleurShimano Deore XT RD-M8000D-GS Shadow Plus
ShifterShimano Deore XT SL-M8000
Gears11 derailleur gears
Crank setMiranda
CassetteShimano SLX CS-M7000 11-42T
Front brakesMagura MT5 hydraulic front disc brake
Rear brakesMagura MT4 hydraulic rear disc brake
SeatpostKind Shock LEV Integra
HubsSTYX Aluminium
Tyre size70-584 (27,5 x 2.8)
StemMonkey Link 1
Weightca. 23,7 kg
Maximum Rider Weight115 kg


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