BULLS E-Stream EVO 3 Carbon 27.5 Plus Review

Bulls E Stream Evo 3 Carbon 27 5 Plus Electric Bike Review
Bulls E Stream Evo 3 Carbon 27 5 Plus
Bulls E Stream Evo 3 Carbon 27 5 Plus Brose Mid Drive Mtn Motor
Bulls E Stream Evo 3 Carbon 27 5 Plus Magura Hydraulic Disc 4 Piston Brake
Bulls E Stream Evo 3 Carbon 27 5 Plus Cockpit Suspension Clickers
Bulls E Stream Evo 3 Carbon 27 5 Plus Transflective Display Console
Bulls E Stream Evo 3 Carbon 27 5 Plus Bottle Bosses Led Indicator Downtube
Bulls E Stream Evo 3 Carbon 27 5 Plus Sr Suntour Aion 35 Suspension Fork
Bulls E Stream Evo 3 Carbon 27 5 Plus Shimano Deore Xt Drivetrain
Bulls E Stream Evo 3 Carbon 27 5 Plus Schwalbe Nobby Nic Tires
Bulls E Stream Evo 3 Carbon 27 5 Plus 32 Tooth Double Chainring
Bulls E Stream Evo 3 Carbon 27 5 Plus High Capacity Downtube Battery Lithium Ion
Bulls E Stream Evo 3 Carbon 27 5 Plus Electric Bike Review
Bulls E Stream Evo 3 Carbon 27 5 Plus
Bulls E Stream Evo 3 Carbon 27 5 Plus Brose Mid Drive Mtn Motor
Bulls E Stream Evo 3 Carbon 27 5 Plus Magura Hydraulic Disc 4 Piston Brake
Bulls E Stream Evo 3 Carbon 27 5 Plus Cockpit Suspension Clickers
Bulls E Stream Evo 3 Carbon 27 5 Plus Transflective Display Console
Bulls E Stream Evo 3 Carbon 27 5 Plus Bottle Bosses Led Indicator Downtube
Bulls E Stream Evo 3 Carbon 27 5 Plus Sr Suntour Aion 35 Suspension Fork
Bulls E Stream Evo 3 Carbon 27 5 Plus Shimano Deore Xt Drivetrain
Bulls E Stream Evo 3 Carbon 27 5 Plus Schwalbe Nobby Nic Tires
Bulls E Stream Evo 3 Carbon 27 5 Plus 32 Tooth Double Chainring
Bulls E Stream Evo 3 Carbon 27 5 Plus High Capacity Downtube Battery Lithium Ion


  • 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, the BMZ battery offers larger than average capacity but fits perfectly into the downtube and is removable
  • Sturdy thru axles with quick release for easy trail maintenance, powerful 180 mm hydraulic disc brakes (four piston in the front), light weight longer travel suspension fork with remote lockout
  • Battery removal can be tricky, the locking core is in a vulnerable position and the charging port cover is finicky to seat correctly, available in two frame sizes at an impressive price, neat to see a 22 gear drivetrain and two bottle cage mounting points

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Video Review

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E-Stream EVO 3 Carbon 27.5 Plus



Body Position:


Suggested Use:

Trail, Mountain

Electric Bike Class:

Pedal Assist (Class 1)
Learn more about Ebike classes


2 Years Motor and Battery, 5 Years Frame


Europe, Canada, United States, Australia, New Zealand

Model Year:


Bicycle Details

Total Weight:

46.5 lbs (21.09 kg)

Battery Weight:

7 lbs (3.17 kg)

Motor Weight:

6.61 lbs (2.99 kg)

Frame Material:

Carbon Fiber

Frame Sizes:

18.11 in (45.99 cm)20.08 in (51 cm)

Geometry Measurements:

32" Stand Over Height

Frame Types:


Frame Colors:

Matte Black with Gloss Black and Metallic Blue Accents

Frame Fork Details:

SR Suntour AION-35 RL-R with 120 mm Travel, Rebound Adjust, Remote Lockout, 15 mm Thru-Axle with Quick Release

Frame Rear Details:

12 mm Thru Axle with QR

Attachment Points:

Bottle Cage Bosses

Gearing Details:

22 Speed 2x11 Shimano Deore XT Shadow Plus, 11-42T

Shifter Details:

Shimano SLX Triggers on Left and Right


SR Suntour CRG513B/CRG37 Cranks, 38T / 28T


Wellgo C-128DU Alloy Platform, Cage Style


STYX Chin Hau Tapered 1-1/2 to 1-1/8"


STYX Alloy, 7° Angle, (80 mm, 90 mm)


Low Rise, 740 mm Length, 25 mm Rise, 9° Bend, 31.8 mm Diameter

Brake Details:

Magura Hydraulic Disc with 180 mm Rotors, MT-5 4 Piston Front and MT-4 2 Piston Rear, Magura MT Levers


Ergon VLG-16828D3 Locking, Flat


Selle Royal Seta M1

Seat Post:

STYX Aluminum Alloy

Seat Post Length:

350 mm

Seat Post Diameter:

30.9 mm


Bulls Eccentric 35 Alloy, 32 Hole


Stainless Steel, 14 Gauge Front 13 Gauge Rear, Black

Tire Brand:

Schwalbe Nobby Nic, 27.5" x 2.8"

Wheel Sizes:

27.5 in (69.85cm)

Tire Details:

Performance Folding

Tube Details:

Presta Valve


Velo Battery Protector Pad


IP56 Ingress Rating, 2.5 lb 5 Amp BMZ Charger, Boost Adds 10 mm to Hub Length in Font and 6 mm in the Rear, KMC X11E Chain, Formula Hubs

Electronic Details

Motor Brand:

Brose Drive T (Trekking)

Motor Type:

Mid-Mounted Geared Motor
Learn more about Ebike motors

Motor Nominal Output:

250 watts

Motor Peak Output:

530 watts

Motor Torque:

90 Newton meters

Battery Brand:


Battery Voltage:

37 volts

Battery Amp Hours:

17.5 ah

Battery Watt Hours:

647.5 wh

Battery Chemistry:


Charge Time:

4.5 hours

Estimated Min Range:

50 miles (80 km)

Estimated Max Range:

130 miles (209 km)

Display Type:

Fixed, Backlit Transflective LCD, BULLS CSI


Speed, Battery Level (5 Bars), Assist Level (None, Eco, Tour, Sport)

Display Accessories:

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

Drive Mode:

Advanced Pedal Assist (Cadence and Torque Sensing)

Top Speed:

20 mph (32 kph)

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Written Review

There really aren’t that many Carbon fiber electric bikes… yet! It’s a combination that makes sense to me but is understandably very expensive. The Carbon fiber dampens vibration and decreases weight which is great for a platform which tends to ride further, maintain higher average speeds and be heavier due to motor, battery and control systems. The BULLS E-Stream EVO 3 Carbon 27.5 Plus is more than a mouthful, it’s a reasonably priced, beautifully designed hardtail electric bike that’s available in two frame sizes. It’s really an amazing e-bike, one that blends in with non-powered mountain bikes perfectly thanks to a compact motor and downtube integrated battery pack. Even the display panel is minimal but you aren’t required to reach down in order to change assist levels as you are with the Specialized Turbo Levo models, nor are you required to fret over a gigantic LCD display as you are with some of the older Bosch, Yamaha and Impulse e-mountain bikes. I like almost everything about it except for the lack of rack bosses at the rear end… because I love to commute with hardtail bikes like this. As it stands, you can add a Thule Pack’n Pedal rack and get pretty good utility without the side to side bumping that many beam racks suffer from. Perhaps Bulls did consider rack bosses but passed to save weight and improve strength of the frame? Amazingly, they did manage to squeeze in a set of bottle cage bosses on the seat tube and you can take out two screws from the battery interface and mount another cage on the downtube. That’s the way it should be in my opinion, so many ebikes forego bottle mounts all together and it’s not always clear why?

The E-Stream EVO 3 Carbon isn’t perfect, it suffers from the same issues as most of the other Brose powered Bulls models. Namely, the battery pack is a bit difficult to mount and dismount due to a key plus sliding lever maneuver. At least it’s secure and doesn’t rattle when riding… I also like the foam pad they mounted to the base for protection. Note that they key is directly in the path of the left crank arm so don’t forget to remove it before baking the bike up or jumping on for a ride lest you sheer it off. Other gripes include a finicky charge port cover, basic non-locking grips and the lack of shift sensing in the motor control system which could protect some of the chain, sprocket and derailleur wear. this electric mountain bike offers 22 gear combinations which is more than double what I see from competing bikes. That means more cadence increments and perhaps more comfort but also more shifting. The motor senses pedal cadence and torque though so it’s up to you to ease off before shifting in order to momentarily deactivate power and shift smoothly. The Brose motor itself is compact, relatively quiet thanks to a belt transition inside and extremely powerful (offering up to 90 Newton meters of peak torque output). Try not to be put off by the 250 watt nominal rating, it peaks closer to 530 watts. Ultimately, it’s efficient and that means longer rides and fewer stops for charging. Note that the motor surround is made of Carbon fiber and does not have deflector tape or padding like the battery. Be careful with it and consider adding some clear tape of your own to reduce nicks and scratches.

Powering the motor is an extra large capacity battery pack with premium Lithium-ion cells. It can be charged on or off the frame and uses the EnergyBus Rosenberger charging format. This means, if you trip over the cable it just pops out without bending pins and hopefully without knocking the bike over. The pack delivers 36 volts of power and 17.5 amp hours which is about 7.5 amp hours more than most electric bikes. Do note that the pack itself has two EnergyBus ports and you can plug into either one when charging separately from the bike (I double checked with the Bulls reps). Even though the pack can be tricky to put on and take off, I like that it’s possible because it weighs seven pounds and there are times (like the winter) when storing it inside away from the extreme cold could make a lot of sense. I might take it off when transporting on car racks as well, especially if there are multiple bikes which could add up and strain your rack or damage your car. Note that both wheels have quick release thru-axles and are easy to remove. The front is a 15 mm and the rear is a 12 mm both with Boost technology (basically they are slightly longer to improve strength and spoke angle).

Operating the bike is very straightforward once it’s fully charged. If you haven’t used it for a while, you might have to press a button on the downtube (which lights up a battery capacity indicator). This sort of primes the bike and allows you to press a second on/off switch along the top edge of the display console. I love how compact this thing is, it’s basically a large rocker button with a transflective display on top. You press down on the display to arrow up or down through three levels of assist. Along the side there’s a walk button and a light switch but this particular Bulls ebike doesn’t come with lights so you can ignore that. Just below the button screen portion of the control pad is a rubber plug protecting a Micro USB port! For me this is really cool because I like to ride with Strava and use GPS. Sometimes I also mount lights and being able to tap right into that huge ebike battery to keep my accessories charged on the go is very cool. So the display gives you speed readouts and a battery indicator with five bars, just like the downtube LED readout. It’s large enough to read the speed but you might end up “feeling” the other stats like which power level has been selected. There’s a tactile click as you press down and it’s nice to be able to do so without looking. The whole thing is small enough to evade notice from fellow cyclists but not so thin that it wouldn’t be impervious to damage during a fall… and it’s not removable. This means the sun, rain and vandalism could happen so consider covering it with your bike glove or just keeping an eye out.

The cockpit on this bike is well setup, it looks good and balances two shifters with a remote lockout lever on the right and the display control pad thing on the left. There’s plenty of space for your lights and other accessories but leaving it clean and clear is best for bumpy terrain. The Bulls E-Stream EVO 3 Carbon maxes out at 20 mph for the US version and is thus a Class 1 electric bike, allowed on more off-road trails than Class 2 or Class 3. Even though it still weighs ~46.5 lbs that’s ~4 lbs less than other premium hardtails I’ve tested. For someone who loves riding cross country and wants to go further, this would be an excellent choice. Bulls offers a five-year frame warranty with two years on the battery and motor. They’ve taken off in Europe and are two years into the US market now with a growing network of dealers. On the one hand, I wish it were full suspension but then for $4,600 and the lighter weight you get, I feel like the larger plus sized tires and awesome suspension fork would do a lot for comfort. I would consider a seat post suspsension myself and BodyFloat sells a Carbon fiber version so you could continue the theme of the bike. Big thanks to Bulls for partnering with me for this review.


  • The tires are a stand-out feature on this ebike, they offer improved traction through a larger contact patch, increased comfort due to more air volume, reduced deflection and slipping on rocks and other angular surfaces and provide great rolling momentum and gap spanning with the 27.5″ diameter size, they are also 2.8″ thick vs. 3″ on some other plus models and I think this decreases weight slightl
  • At 46.5 lbs this is a very light weight hardtail electric bike… especially when you consider the battery capacity at 647.5 watt hours, it’s tough but the Carbon fiber frame shaves the pounds off
  • I was really impressed to discover that the E-Stream EVO 3 Carbon comes in two frame sizes, while they’re both high-step (for strength) more riders should be capable of fitting comfortably, the top tube is angled down so stand-over height is maximized, even so I love that they were able to include bottle cage bosses on the downtube and seat tube!
  • You get 22 gear combinations on this bike which is more than double what I see on a lot of other e-mountain bikes, the setup is 2×11 with Shimano Deore XT Shadow Plus, most mid-drive electric bikes only offer one ring up front (shift carefully given the extra power)
  • Premium Magura hydraulic disc brakes with 180 mm rotors and a 4 and 2 piston setup (four up front to spread out the forces and improve cooling), two-finger levers with adjustable reach let you dial in your hand position and focus on maneuvering
  • Quick release on both wheels so you can transport the frame more easily (perhaps store it inside your car when parking), definitely pop the battery off to lighten it up if you’re using a hang style rack… front axle is 15 mm and the rear is 12 mm for increased strength and stiffness
  • Battery and motor weight are right where you’d want them… low and center across the frame, they also blend in visually and the battery has a foam pad liner on the bottom to protect from rocks and other obstacles
  • The Brose motor is super quiet and features a belt system between gear sets which reduces vibration, making it feel more natural
  • Beautiful paint with minimal decals (matching accents on the frame, fork and wheelset), cables are mostly internally routed for protection and improved aesthetics
  • Super high torque output for climbing, you get up to 90 Nm which pairs nicely with the lower gears, I haven’t had any issues climbing even the steepest terrain as long as I shifted appropriately
  • Wider 30.9 mm seat post diameter improved strength, consider swapping the post out for a carbon fiber BodyFloat for maximum comfort while still keeping it light… tighten the post down to reduce slip but don’t over-tighten and crack the tube
  • The charger works faster than most others I’ve seen, it’s a 5 amp battery charger that weighs a bit more at ~2.5 lbs but is still portable enough to come along in a backpack or something
  • Both wheels offer Boost which gives you 6 mm additional width in the rear and 10 mm additional width up front, this strengthens spoke angle and improves handling
  • The cockpit handlebar area is fairly clean considering you’ve got shifters on both sides and remote lockout for the suspension fork, I love their little transflective display button pad thing because it’s easy to reach and read but doesn’t stand out as “electric bike” or seem as vulnerable as a full sized mid-mounted display panel seen on a lot of other ebikes
  • They were able to squeeze a 6 Volt Micro USB port into the base of the control panel, this lets you charge a phone or other portable electronic device and tap into the huge primary e-bike battery, very cool and well positioned at the handlebar vs. down on the pack where you’d have to run a cable


  • Unlike the Impulse mid-drive, some Bafang setups and the Bosch Centerdrive these Brose motors don’t offer shift sensing and that means you’ll have to be extra careful not to stress the chain, sprockets and derailleur… The system measures pedal speed and torque very quickly so shifting can be done smoothly, it’s just more raw
  • I wish they included rack bosses at the rear because I love to ride hardtails like this during the week as an adventure commuter but I see how that might compromise frame strength or add a lot to the price, consider a beam rack or the Thule Pack ‘N Pedal
  • They key slot for removing the battery pack is very close to the left crank arm which could be vulnerable… you don’t have to leave the key in while riding or anything, just take care when adjusting, same thing with the charging port but it’s magnetic so it won’t get bent pins or anything
  • I would like to see an improvement in the charging port cover, it took me several minutes ad a bit of finessing to get it properly seated on several of the Bulls demo bikes and that’s no fun (considering you probably charge the thing daily), it’s important to keep the interface clean and that cover should fit easily and seal completely in my opinion
  • Actually taking the battery off can be tricky without a second person there to hold the bike… there’s no kickstand so you might lean it against a wall but if you lay it down you’ll have to do so on the drivetrain side because of the key hole position, the second step is a slide lever to disconnect the pack and if the bike is upright the pack might sort of plunk out and get dropped more easily so be careful
  • I like that the grips are ergonomic but not super fat because you can still bear down and maneuver easily with them but wish they were locking, as-is they may twist under pressure and prolonged riding


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10 months ago

Hi Court, thanks for sharing about that Thule rack. It seems like it could be a good solution for most bikes without rack mounting points, but I would be very leery about using it on a carbon frame. There are many who say that you should never mount anything onto a carbon frame as they are not designed to take any kind of compression from bolt on accessories. You even need to be careful about overtightening the seat post bolt. It would be a shame to have a catastrophic frame failure on such a nice bike.

Here is an article about the care and feeding of carbon frames, if someone really wants to use one. And for another perspective, here is a bike shop that flat out refuses to work on carbon frame bikes, because they can be damaged without any visible signs showing the damage.

In general, I think that the weight savings from carbon frames is not worth it with ebikes. The added power from the motor more than cancels out any extra weight inherent in a steel or aluminum frame. And it would seem that weight savings if desired could be found in other places……including sometimes your own body fat…..without taking on the risks inherent in a carbon frame.

Court Rye
10 months ago

Great points Nirmala, I think that’s why some brands haven’t introduced them yet (like Specialized). You don’t save much weight and the power of the motor and battery more than make up for the little weight you do end up with on Aluminum or even Steel. Something to think about… but there is a nicer feel on some Carbon bike frame and I’m guessing Bulls has done their research. Your point about the rack is a good one, just being careful and maybe even asking the manufacturer about it. Perhaps this is a big reason they didn’t include rack bosses to begin with?


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3 months ago

I just stumbled upon the new reise and muller supercharger. It seem to have the distance I am looking for with the new dual battery setup built into the frame for the main stream look. Just wandering about the Gates belt drive setup and its reliability...Anyone list some pros and cons on any of these setups. Also the supercharger already comes with fox front suspension forks.
I'm a big fan of the belt drive. I have it on the Charger and on my human powered bike (Spot bike with Shimano Alfine hub). So far they have been very reliable and it eliminates a lot of maintenance. What I'm becoming less of a fan of is the Nuvinci hub that comes with the belt drive bikes for R&M. At least in my case, the Nuvinci leaves me wanting a bit more gear range. While it is simple to use and so far reliable, if I were making my purchase decision again I might reconsider the Nuvinci version and select the chain driven Shimano 11 speed (Rohloff would be overkill for my flat terrain use). I kinda wish R&M would offer a belt drive version with the Shimano Alfine 11 speed IGH. Seems like that would be a good option for someone like me who prefers an IGH paired with a carbon belt but who really doesn't care for the Nuvinci.

3 months ago

Hello everyone. New to ebikes/bikes in general other then having them as a kid. I have done a lot of research and looking at several different brands. The two in particular is the optibike pioneer carbon and stromer st2. So lets start by my specs and purpose for the bike. I am a 5'5 male 160 lbs. Not very active due to the busyness of life. I live in Atlanta and due to the new beltline being built and traffic in the city I really want to "ditch" the car as much as possible and commute by bike. Using the bike as my main transportation.

With that being said most of my biking will be within 24-30 miles max round trip of my house. With that being said I don't want to be limited as I get in better shape with going further. Also we have hot summers and not looking to be soaked in sweat when I get where I am going (work, grocery store, out on town, etc).

I want maximum range, comfort, handling, exceptional quality built. So I have come down the stromer st2 and optibike. Heres the aftermarket parts I am looking to pair with the bike to achieve desired outcome. The Kinekt seat posts and fox suspensions forks. From what I have read these upgrades will make a world of difference. What I like most about the pioneer carbon is the weight, thumb throttle, and I can buy a extra battery to achieve the same max distance as the st2. The biggest pro about the stromer is the reputation they seem to have as being the best built bike on the market.

Open to other brands also but really like that both of these have a appearance of just a beefier main stream bike. Lets hear some opinions. I am here to learn.

Ian Mangham
1 week ago

Should have put the welgo ally platform pedals everybody loves smh

3 months ago

I never really respected the brand, but this one is a beauty! And so are the electric Black Adder models.
Another advantage is compatibility with handlebar bags.
Also, interestingly, unlike the e-Stream EVO, the carbon Black Adder E models have integrated eyelets for the rack. A big plus, too: rack eyelets in a carbon frame!

William T
10 months ago

Great bike and not that heavy at all... my freeride bike weighs ~43 pounds I believe and that's just aluminum ... this bike is still way too expensive IMO :/

jose ignacio alvarez
10 months ago

QUE MEDIDa tiene esa cámara las ruedas

Mustafa للجيت بي
10 months ago

I want to like him, but my father does not accept

Ian Mangham
1 week ago

Mustafa للجيت بي Say Whaaaat

10 months ago

About time you do a decent bike and stop with the BS bikes.

Robert Groves
10 months ago

Love the bulls bikes, they know how to build a good looking bike and make it look like a regular bicycle.

10 months ago

Why are all these mid-drive bikes only 36v? are there any bosch setups that do 48v?

Ian Mangham
1 week ago

Carlospicywiener Because it's enough

Robert Silvers
1 week ago

Why do you care? Only watts matter for power, and amp-hours matter for range.

Alex Paulsen
10 months ago

Voltage usually bumps the RPM up, and RPM isn't exactly desirable for many laws regarding electric bicycle speeds etc.

Chris Till
10 months ago

It looks cool but it still just looks far too similar to a cheap mountain bike I owned 15 years ago. The only EBike I've seen that really looks like what a modern bike should be is the GoCycle. If you meshed a GoCycle with a full size bike like this, it would be awesome.

Magnesium rims, totally hidden cables and super easy to remove wheels are what excite me now and we're not seeing enough real innovation in cycling.

Seb K
10 months ago

+Chris Till You need to maintain your bikes like you do with a car or motorbike .As long as you oil the chain and make minor adjustments you're fine . Hub gears, gear boxes and sealed drivetrains are heavy as hell . The derailleur system is the lightest you can get . My demo ride on the Gocycle was short but it was enough to convince me not to get it but again these are our opinions . You don't like this bike and I do, you like the Gocycle and I don't . We can all agree that we like this channel though .

Chris Till
10 months ago

Seb K I can't speak to how it performs, but it looks like the future. This looks like the past with some future bolted on. The gears are still going to get out of alignment and make a crackling noise. The chain will still rust after a year of use here if it's ridden in the rain.

Seb K
10 months ago

The Gocycle is rubbish . It looks nice and has some neat folding features but it is weak, slow and handles not so great .

Brady Loughner
10 months ago

You should check out a "super 73"from lithium cycles

Hayden Wilde
10 months ago

Thanks for all your awesome videos Court. I love these Bulls e-bikes, its the big battery's that sell it for me, i live at the bottom of a big valley its uphill in all directions. seriously considering getting one of these :)

Jordan Smith
10 months ago

New York, L.A, Denver. You are always somewhere new. If you drive to all these locations your car must have a million miles on it

Dejan Loncar
10 months ago

great bike!

/Pol/ack The Polack
10 months ago


10 months ago

nice bike.

Larry Conger
10 months ago

I'm guessing you like the Bosch motor the best Court? I know you don't show favoritism but I have 3 Bosch motors and they seem the best but I have no clue on the Brose motor but can you explain what you like better pls

Eric Bourdages
10 months ago

Très intéressant votre chronique