Name: BULLS SIX50 E FS 3 RSI Review
Item: BULLS SIX50 E FS 3 RSI
Author: Court Rye

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BULLS SIX50 E FS 3 RSI Review

Bulls Six50 E Fs 3 Rsi Electric Bike Review

Bulls Six50 E Fs 3 Rsi Chain Tensioner Narrow Wide

Bulls Six50 E Fs 3 Rsi Bosch Powerpack 400 Battery

Bulls Six50 E Fs 3 Rsi Bosch Intuvia Removable Display Panel

Bulls Six50 E Fs 3 Rsi Topeak Ergon Gp2 Locking Grips

Bulls Six50 E Fs 3 Rsi Styx Performance Saddle

Bulls Six50 E Fs 3 Rsi 11 Speed Shimano Deore Xt

Bulls Six50 E Fs 3 Rsi Rockshox Monarch Rt 120 Mm Rear Suspension

Bulls Six50 E Fs 3 Rsi Rock Shox Reba Rl Solo Air

Bulls Six50 E Fs 3 Rsi Shimano M615 Hydraulic Disc Brakes

Bulls Six50 E Fs 3 Rsi Bosch Centerdrive With Alloy Skid Plate

A loaded full suspension mountain bike with premium electric drivetrain from Bosch offering 75 Nm of climbing torque with the CX motor and a 400 watt hour Samsung battery
RockShox air suspension with 120 mm travel front and rear for solid trail or all mountain riding, 15 mm thru-axle up front, 27.5" wheelset for balanced handling
Available in three frame sizes for improved fit, performance saddle and locking Ergon grips, Shimano M615 hydraulic disc brakes with 180 mm rotors for smooth powerful stopping
Unique replaceable alloy skid plate protects motor and matches frame, chain tensioner reduces kickback, slap and shipping thanks to narrow wide teeth, no quick release in the rear

Make:

BULLS

Model:

SIX50 E FS 3 RSI

Price:

$4,599

Body Position:

Forward

Suggested Use:

Trail, Mountain

Electric Bike Class:

Pedal Assist (Class 1)

Learn more about Ebike classes

Warranty:

2 Years Motor and Battery, 5 Years Frame

Availability:

Europe, Canada, United States, Australia, New Zealand

Model Year:

2016

Total Weight:

49.5 lbs (22.45 kg)

Battery Weight:

5.2 lbs (2.35 kg)

Motor Weight:

8.8 lbs (3.99 kg)

Frame Material:

7005 Aluminium

Frame Sizes:

18.11 in (45.99 cm)20.07 in (50.97 cm)22.04 in (55.98 cm)

Frame Types:

High-Step

Frame Colors:

Matte Black with Gloss White and Blue Accents

Frame Fork Details:

Rock Shox Reba RL 27.5 Solo Air, 120 mm OneLoc Remote Lockout, 15 mm Thru Axle, Quick Release

Frame Rear Details:

RockShox Monarch RT Suspension, 120 mm Travel with Lockout and Rebound Adjust, 12 mm Axle, Quick Release

Gearing Details:

11 Speed 1x11 Shimano Deore XT, 11-40

Shifter Details:

Shimano XT Triggers on Right

Cranks:

FSA Cranks, 15T Chainring with Narrow Wide Teeth

Pedals:

Wellgo Alloy Platform, Cage STyle

Headset:

Tapered 1 1/8"

Stem:

6061 STEM 3.OS, 7° Rise (90 mm, 100 mm, 110 mm)

Handlebar:

Low Rise, 720 mm, 25 mm Rise, 9° Bend

Brake Details:

Shimano M615 Hydraulic Disc with 180 mm Ice-Tech Rotors

Grips:

Topeak Ergon GP2 Locking, Flat

Saddle:

STYX

Seat Post:

Alloy

Seat Post Length:

300 mm

Seat Post Diameter:

30.9 mm

Rims:

WTBXC-25D

Spokes:

Stainless Steel, 14 Gauge, Black

Tire Brand:

Schwalbe Rocket Ron, 27.5" x 2.25"

Wheel Sizes:

27.5 in (69.85cm)

Tire Details:

Evolution Liteskin, Tubeless Ready

Tube Details:

Presta Valve

Accessories:

NW Chain Tensioner

Other:

Aluminum Skid Plate

Motor Brand:

Bosch Performance Line CX, Gen 2 (Now Gen 3)

Motor Type:

Mid-Mounted Geared Motor

Learn more about Ebike motors

Motor Nominal Output:

350 watts

Motor Torque:

75 Newton meters

Battery Brand:

Samsung

Battery Voltage:

36 volts

Battery Amp Hours:

11 ah

Battery Watt Hours:

396 wh

Battery Chemistry:

Lithium-ion

Charge Time:

3.6 hours

Estimated Min Range:

35 miles (56 km)

Estimated Max Range:

85 miles (137 km)

Display Type:

Intuvia, Removable, Adjustable Angle, Grayscale, Backlit LCD

Readouts:

Speed, Assist Level (Eco, Tour, Sport, Turbo), Battery Level (1-5), Odometer, Trip Distance, Estimated Range, Clock, Max Speed, Average Speed, Trip Time, Shift Assist Recommendation

Display Accessories:

Independent Button Pad with Tactile Feedback on Left, 6 Volt Micro USB Port on Display

Drive Mode:

Advanced Pedal Assist (Measures Wheel Speed, Pedal Cadence and Pedal Torque, Power Output Relative to Pedal Input: Eco 50%, Tour 120%, Sport 190%, Turbo 275%)

Top Speed:

20 mph (32 kph)

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Make or Model

Model Year

Body Position

Suggested Use

Frame Type

Drive Mode

Availability

Price Range

$0 (0 €)$18,000 (16,920 €)

Total Weight

0 lbs (0 kg)227 lbs (103 kg)

Top Speed

0 mph (0.0 km/hr)50 mph (80.5 km/hr)

Battery Watt Hrs

0 watt3,456 watt

Frame Size

0 in (0.00 cm)432 in (1,097.28 cm)

Motor Power

0 Newton meters250 Nm

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UPDATE: The SIX50 E FS 3 RSI is still being sold by BULLS, even though this particular review was conducted several years ago. They have since updated the Bosch motor to Gen 3 and the battery to PowerPack 500! This means improved performance, power, and range. I’m leaving the review unchanged since the videos, photos, and writeup all represent the older product that I covered :)

Full suspension mountain bikes are my favorite type of ebike because they deliver comfort and a “go anywhere” build that can work on the trails, mountainous terrain or just as well in the city. Sure, there are no fenders, no rack mounting points and no bottle cage… but I usually wear a backpack large enough to fit my laptop or some basic supplies and food. The thing about electric bikes is that they get you to your destination faster than traditional pedal power bicycles, thus encouraging more frequent and lengthy rides. The flip side of the coin is comfort, riding any bike for an hour or more can get a little uncomfortable and thus, fatter tires and full suspension takes its place. Don’t get me wrong, this is a fully capable off-road machine that would be great for dedicated trail riding or all mountain… even cross country if you stiffen up the rear shock. I love the remote lockout on the fork because it allows you to minimize bobbing on smooth terrain, really empowering you to pedal. And that’s also where the drive system shines.

Powering the BULLS SIX50 E FS 3 RSI is a Bosch drive system with upgraded high-torque CX motor. It spins super fast, is extremely responsive, packs in shift sensing and is very durable. My Uncle has been using an older version of this drive system on a full suspension bike for nearly two years now without any motor or battery issues. He added some fenders and a beam rack but often just wears a backpack. That’s the thing about this type of bike, it can be your transportation and your weekend fun! The increased drag of 2.25″ wide knobby tires and added weight of the 400 watt hour battery pack are easily overcome by the motor which should deliver upwards of 30 miles per charge… ~60 if you keep the assist level low. There’s no throttle but my experience with the system has been that the four levels of assist actually mean something with the lowest just overcoming the weight and drag of the bike and the highest feeling super responsive and powerful. You should be able to ascend nearly anything as long as you switch gears appropriately. In the video review above you can see me climbing some impressive sections off-road with constant speeds above 13 miles per hour, even reaching 17 and 18 at some points.

The drawbacks of the Bosch system is that it doesn’t blend in with the bike especially well. The bike stands out as being electric which might bother you riding off-road where others are getting around the old fashioned way. Bulls has done an excellent job integrating the motor and battery in my opinion, blending the colors and surrounding and sort of cupping the base of the battery with some extra metal flanges. I love that in addition to a chainring protector there’s a tensioner with narrow wide teeth to reduce kickback and chain slip. The tensioner is surrounded by a guide that might clear debris and also protect your clothing (if you’re commuting to work with pants for example). I like the four bar rear suspension as well, it orients the RockShox Monarch vertically keeping weight low but unfortunately also taking up the triangle space where a bottle cage might have tried to fit. The frame comes in three sizes for improved fit and since you’ve got quick release on both wheels and a super easy to remove battery and display this bike can be tossed onto most car racks or thrown into the trunk. It’s versatile, good looking and… kind of expensive. Given the Shimano hydraulic disc brakes, Deore XT 11 speed drivetrain and other upgrades like locking Ergon grips, Schwalbe tires and thru-axle design (front 15 mm and rear 12 mm) you’re opting into a higher end product. But, you get what you pay for and Bulls offers a solid two year comprehensive warranty with five on the frame. It’s an e-bike that’s built tough and fairly complete though I would love to have seen a seat post dropper. The seat tube is wide accommodating 30.9 mm posts so you could upgrade this yourself. I prefer the zippy feel and power of the Bosch system to the Brose and others, I really appreciate the shift sensing technology even if it does’t work flawlessly. The speed at which the motor starts and stops is very easy to work with and allows me to pedal more naturally at higher RPM. The motor does make a little bit of extra whining noise as demonstrated in the video but overall it’s great. Bulls did a nice job protecting it with an Aluminum scuff guard along the bottom that’s replaceable if you really push it to the limit. Big thanks to Bulls for partnering with me for this review.

Pros:

This is my favorite type of electric bike, having adjustable suspension front and rear significantly improves ride quality as you go further and at higher average speeds… both shocks are from RockShox and are light weight air designs, the front features remote lockout for easy positioning on cross country rides where the rear might be set stiff simulating a hardtail
The Bosch drive system is a proven winner that will last a long time and be serviced efficiently (through Magura in the US) if something goes wrong, batteries are easy to find and the system is forwards compatible with the new 500 watt hour battery pack
The combination of wheel speed, crank speed and pedal torque measurements delivers some of the fastest pedal assist response I’ve gotten to try and I love that there’s an integrated shift sensing system to reduce chain and sprocket damage (especially for an off-road bike like this)
The bike has a nice aesthetic, everything from the colors they chose to the motor integration and battery seat help to blend the bike with the electric systems
Excellent power delivery thanks to the Bosch CX motor which offers higher torque output of up to 75 Newton meters in the highest assist level
Both the battery pack and display panel can be removed from the bike easily, this is nice for transport, outdoor storage and if you’re riding on difficult terrain and are concerned about crashing the bike…
The 27.5″ wheel size has become popular for trail, all mountain and some enduro ride styles because it carries momentum and spans gaps in terrain while remaining maneuverable and relatively light weight
I love the enlarged rubber slap guard on the right chain stay, it should keep the entire length chip free despite the lower chain height and possibility of bounce given the off-road nature of the bike
Awesome tires from Schwalbe, the Rocket Ron model comes tubeless ready and has evolution liteskin which means thinner lighter weight sidewalls to reduce overall bike weight
Sturdy 15 mm thru axle on the front wheel improves strength and handling, I find that it also makes swapping wheels quicker and easier, especially with disc brakes because they line up easier, you get quick release in the front and rear for easy trail maintenance and transport
Large bash guard surrounding and protecting the sprocket, nice chain tensioner and guide just ahead with a surround design that will not allow it to come off track and might clear debris and mud reducing chain suck
Beautiful wire management (as with most Bosch electric bikes) the shifting and brake cables as well as electronic wires are all internally routed through the frame
Four bar suspension with vertical shock in the rear keeps weight low, limits kickback and performs well under heavy braking but can bob a little more
Slight rise in the handlebars and option to flip the stem for negative angle can help to protect the display in the event of a crash, I’ve seen this sort of design with some Haibike models as well
The Intuvia display is awesome because it’s large enough to read, backlit and uses a remote button pad so you can switch between assist levels without taking your hand off the left grip, there’s an integrated Micro USB port on the right side of the display for charging portable electronics and I like the range approximation in the menus

Cons:

Motor operation is louder than some of the other mid-drive systems I’ve tested from Bulls and Impulse in the past but response time is noticeably faster
Compared with some in-frame battery designs, the Bosch PowerPack stands out a bit more and could generate unwanted attention… however, it’s more convenient to access and tends to be less expensive to replace
Given the Shimano drivetrain and brakes, the premium grips, saddle, tires and suspension this bike ends up costing more… would be nice if it had a seat post dropper for the price (the diameter of the seat post is wider at 30.9 mm so at least it should fit droppers if you get one after market)
I’m not a huge fan of the cage style platform pedals because they don’t offer as much surface area and can get bent in at the end (as seen in the video and pictures), consider replacing with clip in designs or a solid platform like these Magnesium Wellgo pedals
No bottle cage bosses, that’s kind of to be expected given the battery replacement and full suspension design but some of the Brose powered Bulls models were able to add them due to the integrated battery design

Resources:

Official Site: http://www.bullsebikes.com/product/six50-e-fs-3-rsi/
More Pictures: https://goo.gl/photos/CKTLZxC4gowcdyh29

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Top of the line, full suspension, fat tire electric trail bike with RockShock Bluto and Monarch air, remote lockout for the fork, 11-speed Shimano Deore XT drivetrain with Shadow Plus clutch, robust skid plate and alloy drivetrain guides. High-torque Bosch Performance Line CX motor with eMTB drive mode, sand and snow capable if…...

BULLS SIX50 EVO AM 3 Review

An all-mountain style electric bike with longer travel 150 mm air suspension from RockShox, an internalized downtube battery from Bosch, and three frame size options. Fatter 2.8" plus sized tires provide increased traction, reduced deflection, and improved comfort while remaining…...

BULLS CRUISER E Review

MSRP: $3,299
MODEL YEAR: 2018, 2019

A feature-complete cruiser style electric bicycle with paint-matched fork, fenders, rear rack, chain cover, and motor casing, available in three frame sizes with adjustable stem for good fit. Large sprung saddle, puffy stitched grips, swept back handlebars, and the deep step-thru frame make…...

BULLS AMINGA TR 1 Review

MSRP: $4,299
MODEL YEAR: 2018, 2019

A full suspension, cross country style, electric mountain bike made just for the ladies with shorter reach, available in two smaller size options, features a turquoise fuchsia colorway. Sturdy Suntour XCR 34 air suspension fork with remote lockout for easy transitions from rough…...

BULLS TWENTY4 E Review

MSRP: $2,899
MODEL YEAR: 2018, 2019

A tough, sporty looking, high-quality, kids electric bike that can reach ~15.5 mph with four levels of pedal assist, smaller wheels keep the frame low and approachable. Premium accessories including tires from Schwalbe, a Shimano Altus 8-speed drivetrain, and Tektro hydraulic disc…...

BULLS CROSS E Review

MSRP: $2,799
MODEL YEAR: 2017, 2018, 2019

Well priced considering the quality Bosch-made electric drive system, four frame size choices, and three frame styles (high, mid, and low-step). Integrated LED lights and premium Continental tires with reflective sidewall stripes help to keep you…...

BULLS E-STREAM EVO FS 2 27.5 Plus Review

MSRP: $4,099
MODEL YEAR: 2017, 2018

One of the cleanest looking full suspension cross country electric bikes I've reviewed, the battery and motor are built into the frame and match the matte black paint perfectly. Extra large battery capacity for longer rides, EnergyBus magnetic charging standard works on or off…...

BULLS SIX50 E 1.5 Review

MSRP: $3,099
MODEL YEAR: 2017, 2018, 2019

A hardtail trail ready e-bike with comfortable plus sized tires and a spring suspension fork (with lockout), sturdy tapered head tube, rigid thru-axles, and Boost up front. Capable as a commuting platform if you prefer a mountain bike vs. hybrid or city…...

BULLS CROSS LITE E Step-Thru Review

An active, sporty looking, commuter style electric bike with low standover height, available in three frame sizes to improve fit and comfort. High-end drivetrain and motor systems, you get eleven gears with a tough mountain bike level…...

BULLS SIX50+ E FS 3 Review

MSRP: $4,699
MODEL YEAR: 2017, 2018

An all-mountain electric bike with plus sized tires for improved stability, traction and comfort, 150 mm air suspension with compression and rebound adjust. Battery and motor mount design are tighter than older Bosch systems, weight is kept low…...

BULLS E-STREAM EVO 45 FS Review

MSRP: $5,199
MODEL YEAR: 2017, 2018

A high quality full suspension e-mountain bike that's also a speed pedelec (capable of 28 mph top speeds), solid hydraulic disc brakes, wide thru-axles with Boost Technology. Adjustable 150 mm RockShox suspension front and rear, four-bar rear swing arm to reduce brake…...

BULLS E-STREAM EVO 3 Carbon 27.5 Plus Review

MSRP: $4,599
MODEL YEAR: 2017

A Carbon fiber electric cross country mountain bike with premium components and ultra-integrated motor and battery system, excellent weight distribution. The Brose motor is quiet and responsive offering up to 90 Nm of torque output,…...

BULLS DAIL-E GRINDER Review

MSRP: $5,799
MODEL YEAR: 2017, 2018

One of the first Gravel Grinder style electric bikes to make it to America! Made with premium components, high performance lights and a purpose built frame in three sizes. Capable of high speed 28 mph performance, the Bosch centerdrive motor measures bike speed, pedal…...

BULLS SIX50 E 2 STREET Review

MSRP: $3,899
MODEL YEAR: 2017, 2018, 2019

A fully equipped speed commuter capable of 28 mph operation, running on the proven Bosch Performance mid-drive motor and updated 500 watt hour Samsung battery. Extra large 203 mm hydraulic disc brakes offer smooth solid stops without requiring exorbitant hand…...

2017 BULLS LACUBA EVO E8 Review

MSRP: $3,999
MODEL YEAR: 2017

A versatile urban electric bike well suited to commuting, touring and trekking because of its efficient mid-drive motor and larger than average battery capacity, durable internal gearing and belt drive. Available in five frame sizes and three frame styles including wave, mid-step and high-step diamond…...

BULLS E-STREAM EVO FS 3 27.5 Plus Review

A stealthy full suspension all-mountain electric bike with longer travel 150 mm suspension, fully adjustable air fork by RockShox, color matched to frame. Larger 37 volt 17.5 amp hour battery pack to assist with steeper climbs and longer…...

2017 BULLS MONSTER E FS Review

MSRP: $5,299
MODEL YEAR: 2017

Full suspension fat bike with a high quality mid-drive motor from Bosch and their updated 500 watt hour battery pack for extended range. Cool fluorescent paint job that extends all the way through the fork, rear shock housing,…...

BULLS LACUBA EVO E45 Review

MSRP: $4,399
MODEL YEAR: 2017, 2018, 2019

Available in four frame sizes, two styles (high-step and mid-step) with an adjustable stem, active-comfort saddle and ergonomic grips, this bike can fit well and feel good at speed and over long distances. Capable of 28 mph top speeds, this is a Class 3 electric bike with an…...

BULLS E-STREAM EVO FS 3 27.5 Review

MSRP: $4,699
MODEL YEAR: 2016

An all-mountain electric bike with beautifully integrated battery, motor and display... it blends in more than most other e-mountain bikes I've tested and runs quiet. Sturdy 15 mm thru axle in the front and 12 mm axle in the rear…...

2017 BULLS MONSTER E S Review

MSRP: $4,299
MODEL YEAR: 2016, 2017

Premium hardtail electric fat bike with all the fixins, highlights include rear rack bosses, tubeless-ready tires and punched out rims, RockShox air fork with remote lockout and high torque Bosch CX motor. Quality 180 mm hydraulic disc brakes from Shimano for excellent stopping power and modulation, impressive…...

BULLS OUTLAW E45 Review

MSRP: $3,999
MODEL YEAR: 2016

A sporty looking, fairly comfortable speed pedelec capable of ~28 mph top speeds, it's running on an optimized geared hub motor design with heat pipe technology for maximum performance. Unique mid-mount battery box fills the main frame triangle keeping weight low and centered while…...

BULLS STURMVOGEL E EVO Review

MSRP: $3,699
MODEL YEAR: 2016

A beautifully designed urban electric bike painted white for visibility and modern appeal, white walled tires, reflective sidewall stripes, LED lights. Extra sturdy and durable thanks to a 15 mm thru-axle on the front wheel (with…...

BULLS TWENTY9 E FS 3 RSI Review

MSRP: $4,599
MODEL YEAR: 2016

A full suspension, Bosch powered, cross country style electric bike with efficient 29" wheels, it's available in three sizes for good fit and would feel taller and larger for riders with long legs but still fits some shorter riders given the angled top tube. Quick release for both wheels ads convenience for fixes and transporting the bike, I love…...

BULLS CROSS LITE E Review

Fully loaded urban electric bicycle with great accessories for commuting including an aluminum rear rack, full length fenders with mud flaps and integrated LED lights. Relatively light weight at under 50 lbs, this is due in part to the nicer…...

BULLS E-STREAM EVO FS Enduro 27.5 Review

MSRP: $5,399
MODEL YEAR: 2016

An enduro style full suspension electric mountain bike with longer 160 mm suspension travel, seat post dropper, 27.5" wheelset and premium hydraulic brakes. Downtube-integrated battery pack is out of sight and keeps weight low and centered across the…...

bob armani

7 years ago

Court-This is an awesome bike that I would consider buying for city/bike trail use. The battery is so powerful, but yet pretty light considering the size of the cells. The fluid response sounds better than some of the Bosch mid-drives. I understand that the Brose motor has a belt instead of gears meshed together. I also spoke to Barney at Bulls on the phone and he indicated that the frame sizes are available in 41cm which would fit me perfect. This is a candidate bike for me! Thanks for your awesome reviews.

Court Rye

For sure! Glad you enjoyed the review Bob… I like the Brose motor a lot, while I believe there are still some gears inside to change from high RPM to lower high-torque use, I think there’s a belt connector somewhere in there to reduce vibration and possibly keep it quieter. So far, having used the Specialized Turbo quite a bit (which I purchased earlier this year to get a more thorough feel for Brose) it has been great.

Bob Armani

I was referring to Bulls Estream EVO 27.5. (FYI-The post comment button is not active). but yeah I was also looking at the specialized turbo as my 2nd choice due to the frame sizes and the very handy throttle control. My dealer indicated that the bike may be discontinued in mid 2017 according to the specialized rep. Does your bike have walk assist, or has it been deactivated? That is so lame that the US has to interfere with those small details due to liability issues. Great job Court! I dream about having a job like yours! Been into bikes my entire life!

BTW-The Cycleboard people are up and running. Hope to see you on that awesome looking vehicle as well!