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The BULLS SIX50 E FS 3 RSi 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. There two battery sizes available (400Wh or 500Wh) both are removable and lock in place with a key for added security. Shimano Deore IceTec hydraulic disc brakes provide  excellent stopping power, Rock Shox Reba RL Solo Air forks and Rock Shox Monarch RT rear shock 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)


Frame Size S(46) M(51) L(56)
Seat tube length A 460mm 510mm 560mm
Top tube length B 590mm 605mm 620mm
Chain stay length C 465mm 465mm 465mm
Bottom bracket offset D 25mm 25mm 25mm
Head tube length E 115mm 115mm 140mm
Head tube angle α 69° 69° 69°
Seat tube angle β 73° 73° 73°

frame size geometry Bulls



Frame 7005 aluminium
Frame Size 46/51/56 cm
Weight ~ 21,9 kg
Fork Rock Shox Reba RL 27,5 Solo Air, 120 mm, OneLoc remote, 15 mm through Axle
Rear Shock Rock Shox Monarch RT, 120 mm
Drive Train BOSCH Performance Line CX 250W
Rear derailleur Shimano Deore XT RD-M8000 GS, 11 -speed, shadow plus
Shifters Shimano Deore XT SL-M8000
Handle FSA, 15T
Cassette Sprockets Shimano Deore XT CS-M8000, 11-40T
Brakes Shimano Deore BR-M615 Ice Tech, hydraulic disc, 180/180 mm
Handlebar STYX
Seat post STYX aluminium
Saddle STYX
Hubs Formula
Wheel size 27,5 Zoll
Tyres Schwalbe Rocket Ron Evolution 27,5 x 2.25
Pedals Wellgo
Extras Powerpack: 36V/11Ah/400Wh / Range of performance: up to 175 km depends on riding, conditions and terrain / 4 modes: Eco, Tour, Sport, Turbo / Charging time: approx. 2,2 hrs to 80%, approx. 3,5 hrs to 100%


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

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

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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)
Email: info@justebikes.co.uk


no brown box delivery1


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