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The BULLS SIX50 1.5 is a high quality electric mountain bike built on 27.5 inch rims – this wheel size performs well on hard surfaces and even better off-road. It features BOSCH’s most powerful CX motor producing 75Nm. The 400Wh BOSCH battery is removable and can be locked in place with a key for added security. Tektro HD-M290 180mm diameter hydraulic disc brakes provide excellent stopping power, Suntour forks with remote lock-out can cope with the toughest terrain.

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



For larger image please see bottom of page.

Motor Power
Battery Location
Downtube Rmovable
< 90
Battery Chemistry
and Capacity

Li-Ion, 500 Wh
(36 Volt x 14Ah)

500 36 14

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)


bulls electric mountain bike


Equipped with the BOSCH Performance Line electric drive unit the AMINGA E1 e-mountain bike will carry you effortlessly over all terrain. A great all rounder and great value for money, equally at home on the tarmac or off road tracks.


▶ Electric Bike Drive System

▶ A drive system that reads your mind:

Three sensors measure torque, speed and acceleration more than 1,000 times per second, ensuring perfect integration between you and your e-bike. This adaptive power characteristic of the Bosch Performance Line drive system is controlled by your pedal pressure, this ensures smooth assistance in normal riding conditions and the seamless transition to full power for strong acceleration when you need it.

▶ Peak power: 500W (250 max continuous)

▶ Peak torque: 63 Nm

▶ Assistance level: ECO: 50%

       TOUR: 110%

       SPORT: 170%

       TURBO: 260%

The level of assistance ranges between 50% and 260% depending on which power level you choose; 100% assistance equates to the motor doubling your pedaling force.


▶ Electric Bike Battery


Bosch’s lithium-ion based e-bike batteries are lightweight, compact and available in 400Wh and 500Wh capacities. With unrivaled energy density Bosch batteries offer market leading range to weight ratios whatever size you choose.

They are easy to fit and remove, and can be charged either on the bike or unlocked using its key for charging at home or work. The battery management system provides optimal protection against overload, overheating and short circuit.

Modern Bosch lithium-ion batteries do not suffer from ‘memory effect’ or self-discharge issues. Your battery will charge to 50% in about 2 hours, depending on the charger and battery capacity.



▶ Electric Bike Display & Assistance Control

Bosch Purion e-bike display smallThe Bosch Purion display gives you all the information needed to monitor and adjust your e-bike. The illuminated screen is clearly visible under all lighting conditions and  thumb switches enable you to change assistance levels while keeping your hands safely on the handlebar. As well as speed, range, battery level and trip functions the display also lets you know  when it’s time to haver your e-bike serviced!

▶ micro USB connectivity

▶ five assistance levels

▶ back-lit LCD

▶ info on charge status, speed, assistance level, range, trip and total distance.





The Shimano Deore 9-speed system delivers accurate and dependable shifting. It’s matching Alivio selector ensures perfect synchronization and has a built-in micro adjuster to compensate for cable wear.


▶ Suntour XCM Air Suspension

The BULLS Anmiga is fitted with quality Suntour XCM 100mm AIR forks. These are designed with serious mountain biking in mind and will provide may years of dependable service. The yoke features a hydraulic lock-out and the stanchions are forged from aluminium to keep weight down whilst not compromising strength.


▶ Tektro HD-M285 Hydraulic Disc Brakes

Tektro HD-M285 hydraulic disc brakes feature dual pistons and give good stopping power without braking the bank.

It is a solid durable system with an exceptionally smooth operating feel and good feed back – it’s easy to apply exactly the right amount of stopping power whatever the road conditions. As with all Tektro hydraulic disc brakes, maintenance is simple and spare parts are readily available worldwide.



Drive unit Bosch Performance Line
Engine type Middle motor
Torque 250 Watt
Assistance speed up to bis 25 km/h
Power pack Bosch
Power type Lithium Ionen
Range up to 190 km
Battery voltage 36 V
Battery capacity (Ah) 11 Ah, 13,4 Ah
Battery capacity (Wh) 400 Wh
Charging time 100% ca. 3,5 hrs
Charging time 50% ca. 1,5 hrs
Frame size 37 cm, 41 cm, 46 cm
Wheel size 27,5 inch
Fork SR Suntour XCM DS HLO
Travel 100 mm
Rear derailleur Shimano Deore RD-M592-SGS Shadow
Shifter Shimano Alivio SL-M4000
Gears 9 derailleur gears
Crank set
Brakes Tektro HD-M286 hydraulic disc brakes
Brake levers Tektro HD-M286
Saddle BULLS
Seatpost STYX Aluminium
Chain KMC
Spokes Nirosta
Hubs STYX Aluminium
Tires STYX Ace of Pace
Tyre size 57-584 (27,5 x 2.25)
Handelbar STYX Aluminium
Pedals Wellgo
Weight ca. 21,9 kg

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


bulls electric mountain bike aminga e1

BULLS make 77 different models of electric mountain bike, each designed to meet a specific need – if you would like us to help you find the perfect BULLS for you please email or call Clare or James on 0208 960 9848 (London), Keith on 01728 830 817 (Suffolk), or Martin at our Midlands branch on 0116 3666 980 (Leicester).

Commissioned and road tested e-bike 

Before being delivered your electric bike is checked and road-tested by our expert staff to make sure everything is perfect.

Fully assembled and delivered direct to you by our expert staff

We don’t believe your e-bike experience should begin with a white van dropping off a brown cardboard box. This is a whole different delivery experience – our experienced staff will gladly 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!

no brown box delivery1

One of our team will deliver your e-bike 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.

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.

No quibble 100% money-back guarantee:

In the unlikely event that you’re not 100% delighted with your e-bike after the test-ride we simply take it back and either return later with alternative model of your choosing, or give you a 100% refund*.

*Note: After you have inspected the bike, completed the test ride and agreed that this is the right bike for you, the sale will be complete. 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 (eg order a white bike and later decide you prefer black) we reserve the right to make reasonable charges for delivery and or any work done to the bike prior to delivery.

Parts and labour warranty:

A solid manufacturers warranty is a key benefit of choosing one of our quality European made e-bikes. In the unlikely event that a component fails a replacement will shipped to us from Holland or Germany, usually within 24hrs, and fitted free of charge either at our Suffolk workshop, or at your home if you have purchased our on-site service option.

Note: All our e-bikes carry a minimum two year warranty; please see e-bike specification table for model-specific variations.

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.

On-site service:

Convenient dates for your service visits are arranged with our staff when we deliver your bike.

Experience has taught us that regular preventative maintenance is much better than simply reacting to problems as and when they occur. By choosing our on-site service option you’ll have the peace of mind that potential problems are likely to be identified and dealt with before they arise, thereby helping ensure your e-bike is safe and in good working order.

In the unlikely event that an unexpected problem arises – for example a puncture or broken front light – simply call or email us to bring forward a scheduled service and we will visit and carry out repairs.

Note: If you would prefer to bring your e-bike to our Suffolk workshop for servicing, the cost is £40 plus VAT.



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