BULLS E-Stream EVO FS 3 27.5 Plus Review

Bulls E Stream Evo Fs 3 27 5 Plus Electric Bike Review
Bulls E Stream Evo Fs 3 27 5 Plus
Bulls E Stream Evo Fs 3 27 5 Plus Brose 250 Watt Geared Mid Motor
Bulls E Stream Evo Fs 3 27 5 Plus Hidden Removable Battery Pack
Bulls E Stream Evo Fs 3 27 5 Plus Mountain Bars Locking Ergon Grips
Bulls E Stream Evo Fs 3 27 5 Plus Transflective Control Button Interface
Bulls E Stream Evo Fs 3 27 5 Plus Rockshox Yari Air Fork 150 Mm Travel
Bulls E Stream Evo Fs 3 27 5 Plus Rockshox Monarch Rear Shock
Bulls E Stream Evo Fs 3 27 5 Plus Magura 180 Mm Hydraulic Disc Brakes
Bulls E Stream Evo Fs 3 27 5 Plus Shimano Deore Xt Shadow Plus 22 Speed Drivetrain
Bulls E Stream Evo Fs 3 27 5 Plus Skid Plate Stickers Protection
Bulls E Stream Evo Fs 3 27 5 Plus Electric Bike Review
Bulls E Stream Evo Fs 3 27 5 Plus
Bulls E Stream Evo Fs 3 27 5 Plus Brose 250 Watt Geared Mid Motor
Bulls E Stream Evo Fs 3 27 5 Plus Hidden Removable Battery Pack
Bulls E Stream Evo Fs 3 27 5 Plus Mountain Bars Locking Ergon Grips
Bulls E Stream Evo Fs 3 27 5 Plus Transflective Control Button Interface
Bulls E Stream Evo Fs 3 27 5 Plus Rockshox Yari Air Fork 150 Mm Travel
Bulls E Stream Evo Fs 3 27 5 Plus Rockshox Monarch Rear Shock
Bulls E Stream Evo Fs 3 27 5 Plus Magura 180 Mm Hydraulic Disc Brakes
Bulls E Stream Evo Fs 3 27 5 Plus Shimano Deore Xt Shadow Plus 22 Speed Drivetrain
Bulls E Stream Evo Fs 3 27 5 Plus Skid Plate Stickers Protection


  • 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 rides, the motor, battery and display are seamlessly integrated and cables are internally routed
  • Fatter 2.8" plus sized tires absorb vibration, increase surface patch and reduce deflection, they pair well with the 27.5" diameter for quick maneuvering, both wheels have thru-axles and quick release
  • BULLS managed to squeeze in a bottle cage mounting point on the downtube, upgraded Ergon grips and Selle Royale saddle, premium Magura 180 mm hydraulic disc brakes but no seat post dropper

Video Review

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E-Stream EVO FS 3 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:

54 lbs (24.49 kg)

Battery Weight:

7 lbs (3.17 kg)

Motor Weight:

6.61 lbs (2.99 kg)

Frame Material:

7005 Aluminium

Frame Sizes:

16.14 in (40.99 cm)17.32 in (43.99 cm)19.29 in (48.99 cm)21.26 in (54 cm)

Geometry Measurements:

31.5" Stand Over Height

Frame Types:


Frame Colors:

Matte Black with Gray and Red Accents

Frame Fork Details:

Rock Shox Yari RC 27.5 Solo Air, 150 mm Travel, 15 mm Maxle with Quick Release and Boost

Frame Rear Details:

Rock Shox Monarch Plus RT, 150 mm Travel, Rebound Adjust, 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 Deore XT Triggers on Right and Left


FSA Cranks, 38T / 28T


Wellgo Alloy Platform, Cage STyle


FSA Tapered 1 1/8"


Alloy, 7° Angle, (70 mm, 80 mm)


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

Brake Details:

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


Ergon VLG-168283 Locking, Flat


Selle Royal Seta M1

Seat Post:

Aluminum Alloy

Seat Post Length:

350 mm

Seat Post Diameter:

30.9 mm


WTB ASYM i35, 32 Hole


Stainless Steel, 14 Gauge Front 13 Gauge Rear, Black

Tire Brand:

Schwalbe Rocket Ron, 27.5" x 2.8"

Wheel Sizes:

27.5 in (69.85cm)

Tire Details:

Tubeless Ready, Folding, EVO Liteskin, Trail Star 3

Tube Details:

Presta Valve


Velo Battery Protector Pad


IP56 Ingress Rating, 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

Plus sized tires are becoming increasingly popular for electric bikes. That’s because they improve comfort a bit, increase your contact patch size resulting in better traction and they disperse some of the added weight that a motor and battery produce on the frame. I suppose they would have become popular more quickly with traditional pedal-powered mountain bikes except for the added drag and weight. With an e-bike, you’ve got electric assistance that more than compensates for a bit of drag and thus, more bikes are turning to these tires as a sweet spot between 2.25″ and the much larger 4″ fat tires often reserved for sand or snow riding. With the E-Stream EVO FS 3 27.5 Plus you get 2.8″ wide plus sized tires whereas some competing bikes are opting for full 3″. I found these to perform similarly, perhaps they’re slightly lighter due to the lower volume of rubber? Another unique quality of the wheels on this bike are that the hubs use Boost technology which is to say, they are slightly longer. This allows for steeper spoke angles and a stronger more sturdy wheel as a whole.

Okay, with all of that tire and wheel stuff behind us, let’s chat about the drive system a bit. One of the coolest aspects of the Brose powered models from BULLS this year is that the battery pack and motor are extremely tightly integrated… nearly disappearing into the frame. This is a beautiful looking, well balanced and QUIET electric bicycle designed to Class 1 specifications, meaning it only assists up to 20 mph and does not offer a throttle. In many parts of California, that means you can legally ride it on mountain bike paths. It’s perceived as a human powered cycle first because it uses a combination of wheel speed, cadence and most importantly, pedal torque activated operation. Laws aside, what I found was a super-responsive mountain bike that felt comfortable even when riding near steep cliffs, as I did in the video review above. In this type of terrain, you don’t want a clunky or slow-to-react drive system because it could take you past the mark resulting in an accident.

The Brose motor used here offers a whopping 90 Nm of peak torque and a range of 250 to 530 watts power output. At high cadence, you can hear a pronounced electronic whirring noise but I’d consider it one of the quietest mid-drive systems on the market right now. This is due in large part to the addition of a belt link inside the motor case that reduces vibration. I’m only guessing but this might help to extend the life of conversion gears and as a rider, it does create a smoother feel than say, Bosch. Now, I’m a huge fan of Bosch and BULLS offers this drive system on many of their other mountain models… but it’s a lot zippier and the chainring is limited to just one sprocket. A huge differentiator with the Brose motor is that multiple chainrings can be used and in the case of the EVO FS 3 Plus, they opted for an 11 ring cluster in the rear with two rings up front. The shifter and derailleur hardware is higher-end Shimano Deore XT Shadow Plus and although the motor does not offer shift sensing, I had no problem shifting without much mashing when I adjusted my shifting behavior a bit… making sure to ease off the torque pressure and thus, deactivating the motor before shifting.

This is a really fun and capable all-mountain electric bike. It has longer handle bars (as it should) locking Ergon grips for stability, a four-bar link suspension with quality RockShox components and the’ve even managed to squeeze in a bottle cage mount. One thing I’m not super fond of is how the battery pack locks in and charges on the bike. While I love that Bulls opted for the EnergyBus magnetic charging interface (that reduces bent pins and tipped bikes if tripped over) I don’t like the little rubber cover that’s used on the frame. It can be difficult to force into the charging port hole when not in use and I just feel like more dust and water will get in as a result. Also, you have to manually lock the battery in after clicking it onto the frame. It’s like a two step process where you use a keyed slot for locking the battery and a separate slider rod for disconnecting and taking off the pack. Perhaps this was intentional as twisting a key while holding a battery requires more finesse vs. sliding a rod while holding a battery… but in both cases you need to be extra careful not to drop the battery and in the former, if you leave your key in and forget, then later move the bike backwards the left crank arm may collide with and bend the key! It’s all just a little cramped and tedious. But at least it looks good, secures the battery properly and I like that they included foam pads on both the motor casing and battery case base to deflect rocks and other debris.

Having used this bike a bit on true mountain terrain as well as the popular Specialized Turbo Levo which also uses the Brose motor and has plus sized tires… I must say I enjoyed both. Priced at $4,699 I find the Bulls option to be quite tempting. And although they are somewhat new to the US market, their reputation in Europe and Asia is good and their warranty is reassuring. You get two years comprehensive and they are opening more and more dealers each year. My final thought is that it’s great to have a wider range of size options on this and other e-mountain bikes. This thing isn’t super light at ~54 lbs, nor is any other full suspension higher capacity build. Not having to worry about a frame that doesn’t fit or one with an unnecessarily high stand over height is nice. I appreciate the sloped top tube here and the overall stability of the geometry. Most of all, I just think it looks great. Big thanks to Bulls for partnering with me for this review.


  • Available in four frame sizes for improved fit and comfort on longer rides, the top tube is angled as much as possible while still affording a vertical rear shock (lower weight distribution along with the battery and motor)
  • The electronics on this bike are extremely well integrated and hidden, the battery mounts up into the downtube, the motor completely replaces the bottom bracket with a custom interface and even the display panel is small and unobtrusive (just a toggle switch with little readouts) most wires are internally routed across the frame
  • The slightly larger 2.8″ wide tires offer more cushion, better traction and less deflection which makes them fun to ride on trails and mountainous terrain, the Schwalbe Rocket Ron model is designed with thinner sidewalls to reduce weight and are tubeless ready for further reduction while also permitting low PSI without “snake bite” tube punctures
  • Amazingly, despite the main triangle being mostly occupied by the rear suspension and tighter area due to the sloped top tube you are able to mount a bottle cage or other accessory using the bolts on top of the battery
  • Longer travel 150 mm suspension fork and 15 mm thru-axle makes this a great candidate for enduro and all-mountain riding, the rear 150 mm suspension is also solid with some adjustability on stiffness and you get a 12 mm axle there… both are quick release for easier maintenance and transportability
  • You get 22 gear combinations here with quality Shimano Deore XT Shadow Plus components, if you’re climbing a lot this comes in handy and the E-Stream EVO FS 3 27.5 Plus is one of the few mid-drive full suspension ebikes I’m aware of with that many gears
  • The Brose motor is very quiet and smooth thanks to a belt interface between the gearing parts that reduces vibration… I also found that it was responsive and quite powerful
  • I appreciate the upgraded touch points including locking Ergon grips and comfortable Selle Royal Seta M1 saddle
  • MT-4 and MT-5 hydraulic disc brake calipers from Magura (two and four piston models respectively) offer great stopping power, both rotors are 180 mm diameter for dispersing heat
  • The wheels are built with “Boost” which means they have longer hubs that allow for a stronger spoke angle and stiffer handling
  • Both the battery and motor casing have a layer of foam padding on the base for protection against rocks and gravel flying up as you ride, it’s not as tuff as some other BULLS ebikes with metal scuff plates but also doesn’t weigh as much
  • Despite being so small and compact, the toggle button / display panel thing near the left grip has a built in Micro USB charging port so you can power your phone or other portable electronic device!
  • Impressive two year comprehensive warranty, 1,000 full cycles on the battery and five years on the frame… this is a larger more established company with good support


  • Be extra careful when keys are inserted into the battery lock as they are directly in the path of the left crank arm (which rotates backwards if you roll the bike backwards)
  • The battery comes out downwards from the downtube and while it’s secure once unlocked, if you’re pulling down to remove it there’s a bit more force at play due to gravity and that makes it easier to drop or mishandle
  • This is one of the only bike designs I’ve seen with a battery that can be clicked onto the bike but not locked (you have to purposefully lock the core using the keys), a secondary slide mechanism unclips the pack
  • I feel like the rubber flap covering the charging port on the lower left are of the downtube could work better, it doesn’t fit into the charging hole very easily and this means dust and water can get in
  • There’s no shift sensing technology on the electric bike drive system and considering you get 22 gear combinations, that means you’ll have to be extra thoughtful about how and when you shift, it’s torque sensing so just get up to speed then ease off while shifting before applying more pressure
  • I’m not sure this bike comes with a slap guard? Consider adding a neoprene wrap or sticker (even clear tape) to avoid chips on the right chain stay
  • Good combination of rolling momentum and quick handling with the 27.5″ wheel size here, I’ve found that they also don’t clip my toes as much as 29ers
  • Given the longer travel suspension I was surprised that they didn’t add a remote seat post dropper, this kind of thing is very handy when you start to do more downhill riding and the bike is priced pretty high so it would have been nice if it was included, here’s a solid dropper that would fit the 30.9 mm diameter of the bike for consideration


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Comments (8) YouTube Comments

2 years ago

Hi Court! Just curious how much effort is it to pedal this and other similar weight FS MTB e-bikes at or above the 20 mph motor assist cut-off point? In other words, do you need “pro cyclist legs” to reach and maintain higher speeds (i.e., say 21 to 25 mph) on flat paved surfaces with no head wind pedaling in the highest gear (for this bike = 3.5 gear ratio) assuming pedaling at a high cadence (above 100-120 RPM)?

2 years ago

Hi Pete, in my experience it is very difficult to top and consistently maintain even 20 mph on flats with calm air if the motor is not supporting you. The added weight and friction of electric mountain bikes is a limiter. There are some eMountain bikes that have Class 3 drive systems which can hit ~28 mph but they are rare. This is just my experience and I haven’t focused on it as much as I should… I’d love to hear your experience if you can get out and test the theory. I regularly top 20 mph but it’s usually on downhill sections.

Yossi Geretz
1 year ago

I got this bike – E-Stream EVO 2 (hardtail). Here’s the good, the bad and the ugly.

The good: The bike is heavy, no doubt. Without assist, this moves like pulling a boat away from the dock with a rope in your teeth. Turn on the assist though and this bike is NIMBLE – moves like a dream! I love the fact that this has a huge 650 watt-hours battery, one of the largest I’ve seen. At level three assist, (4 is the max) in hilly territory, I am able to get 15 miles out of each bar. With 5 bars, this should get me 75 miles. Of course, I don’t like to shave it that close. As I mentioned, if I ever run out of juice it’ll be like towing a boat overland. But I’ve gone on a number of 45 mile runs and come back to base with two bars of juice left on the battery. The motor is silent and lends such a natural and smooth assist to your own effort. This bike makes biking fun again!!!

Here’s the bad and the ugly. HUGE design flaw, embedding the battery in the *bottom* of the downtube. Just this past Monday I locked in the battery and set off on a ride. I didn’t get far when I hit a bump at 20mph and CRASH, the battery just dropped out of position. Now the battery is dead and it’s my word against the dealer. I say I locked the battery in place, the dealer says no – user error. Not sure where this is going to go, but these batteries are $950. Not too happy right now…

Suggestion for manufacturer:

  1. For a minor bit of added engineering, you can ensure that the battery not make contact unless it is properly locked into position! This would clarify the point for every rider. If the battery is providing power, it’s locked in, otherwise it’s not.
  2. Why not embed the battery on the *topside* of the downtube? (Most e-bikes, even stealth bikes, do it this way.) This would add a measure of safety since gravity would work together with the locking mechanism to keep the battery in place.

Once I get back on the road, I am going to use a couple of velcro straps to augment the locking mechanism to make sure that, if the battery drops out of place, at least it won’t smash against the pavement.

1 year ago

Ouch! Thanks for tactfully sharing your difficult situation Yossi, that sucks. I didn’t drop any batteries during my tests but I did feel that the interface was overly complex. You have that slider lever and a keyed locking core… I noticed that I did not have to lock the key in order to mate the battery, and this would let people potentially just unlock and take the battery (or maybe allow it to clunk out easier as in your situation). The charging port cover is also a bit finicky. Definitely room for improvement… but it looks like Bosch is also going for the under-mount approach with their upcoming Powertube design. For me, it’s difficult to bend down and pull the battery out this way vs. lifting up. So yeah, I like how Specialized did it with their Turbo Vado which also uses a Brose drive system. I guess Brose allows each manufacturer to set their battery up however they want.

Yossi Geretz
1 year ago

In all fairness, I should mention that the question of warrantee isn’t entirely up to the dealer. The dealer is a nice guy, and he’s trying to work it out but given the fact that the case is a bit banged up, he doesn’t feel that there is any chance of getting the manufacturer to honor the warrantee. That being said, the dealer is trying to work with me, to revive this battery, either with assistance from the manufacturer, perhaps they’ll recondition the battery for me for a fee, or as a last resort, perhaps we’ll open the case ourselves and hopefully find some loose connection which can be easily fixed. If anyone wants a good dealer in the Hudson Valley area I could name him, but I don’t know if you allow that level of blatant commercial ‘advertising’ on this forum?

Anyway, the hit to the battery stings, but I am having tons of fun on this bike. (I am mobile again because I had already ordered a spare so that I can do centuries.) I would encourage Bulls to tighten up the engineering of the locking mechanism to prevent activation unless the battery is firmly locked into place. This would be a low-tech mechanical solution with a huge bang for the buck for consumers.

Yossi Geretz
1 year ago

Just a follow-up to say that I’m getting ‘radio silence’ from both the dealer and the manufacturer on the question of whether I can get the battery replaced under warrantee or at least repaired. It was all smiles when I was shelling out the $4,500 for the bike and the extra battery but where’s the support???


1 year ago

Hmm, that’s a bummer Yossi, maybe Bulls will reply or be more available to help now that Eurobike and Interbike have ended. Try reaching out again, some dealers even go to these events and can get distracted. I just got back myself and have been behind on emails


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