Grinder EVO



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Gravel bikes are versatile racing bikes that deliver decent speed on the street and in light terrain. The Bulls GRINDER EVO was developed inspired by this type of bicycle, which is used in the USA for long distance races on rough terrain.

With responsive and comfortable frame geometry, the powerful BOSCH Performance Line CX drive unit and the fully integrated BOSCH PowerTube 500Wh battery pack, it is a gravel-e-bike that is designed for daily journeys and long trips.

With mud guards and saddle back rack it has the right equipment on board for both everyday and leisure use. The athletic character of the all-round racer is further underpinned by the SRAM Apex racing bike group with brake-shift levers and hydraulic disc brakes. The perfect combination of speed and grip on variable terrain is provided by the high-quality Schwalbe G-One tyres.

In the Bulls Grinder EVO, maximum drive unit-power and long-distance comfort have been combined to create a versatile e-bike for fast rides on and off the street.

If you’d like a test-ride please call in at our London, Leicester or Suffolk branches, or email 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 manufacturerBosch
Drive unitBosch Performance Line CX
Motor typeMiddle motor
Torque250 Watt
Assistance speedup to 25 km/h
Power packBosch
Power typeLithium Ionen
Battery voltage36 V
Battery capacity (Ah)13,4 Ah
Battery capacity (Wh)500 Wh
Charging time 100%
DisplayBosch Intuvia
FrameAluminium Hydroforming,Tapered Steerer, internal cable routing
Frame size48 cm, 52 cm, 56 cm
Wheel size28 inch
ForkSR Suntour NCX E LO Air
Travel63 mm
Rear derailleurSRAM Apex 11-speed
ShifterSRAM Apex
Gears11 derailleur gears
Crank setMiranda
CassetteSRAM PG-1130 11-42
BrakesSRAM Apex HRD hydraulic disc brakes
Brake leversSRAM Apex
SeatpostBULLS Duroflex Carbon
RimsBULLS XC-21D tubeless ready
Front hubFormula RX 81
Rear hubFormula RX 2611
TiresSchwalbe G-One Raceguard
Tyre size40-622 (28 x 1,50)
StemMonkey Link 1
Weightca. 19,9 kg
Maximum rider weight115 kg


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