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COPPERHEAD EVO AM 4 750

Designed for the pros, but available to everyone. Featuring a 12-speed XTR drivetrain, mullet wheel setup, four-piston brakes, a coated dropper post, and other premium components, the AM4 stays ahead of the competition.

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FEATURES

COPPERHEAD EVO AM 4 750

  • The BULLS Copperhead EVO AM 4 750 is our top-shelf all-mountain eMTB, engineered to dominate demanding trails with power, precision, and confidence. With a rugged build and pro-level specs, it’s your ticket to take on any terrain—uphill, downhill, or full send mode.

Motor and Battery

  • Motor: Bosch Performance Line CX motor with 85 Nm of torque for aggressive acceleration and precise control on any incline or descent.
  • Battery: Bosch PowerTube 750Wh battery, fully integrated into the frame for a clean look and epic range. Full charge in approx. 6 hours with the Bosch 4A charger.

Suspension and Frame

  • Fork: SR Suntour Durolux 36 RC2 Boost with 150mm of travel to soak up big hits and gnarly terrain.
  • Rear Shock: SR Suntour RS19 TRIAir 3CR delivering 150mm of smooth, responsive travel in the rear.
  • Frame: Aluminum 6061 frame with internal cable routing. Sizes: 41 cm / 44 cm / 48 cm / 54 cm to fit a wide range of riders.

Drivetrain and Brakes

  • Drivetrain: Shimano XTR 12-speed gearing offers crisp shifting and a wide range to conquer technical climbs and high-speed descents.
  • Brakes: Shimano BR-M6120 4-piston hydraulic disc brakes with 203mm rotors front and rear for confident braking in all conditions.

Wheels and Tires

  • Wheels: Mullet setup with a 29" front and 27.5" rear wheel for a killer mix of rollover capability and playful handling.
  • Tires: Schwalbe Magic Mary (front) and Hans Dampf (rear), Super Gravity casing, 2.6" wide—maximum grip and control wherever you ride.

Additional Features

  • Remote: Bosch LED Remote with Bluetooth connectivity—syncs with your phone and displays ride data in real-time. Easy to navigate with your thumb, even on the move.
  • Dropper Post: Limotec A1-Z dropper post for on-the-fly seat height changes that adapt to the trail.
  • Pedals & Saddle: Comes with BULLS MTB pedals and a Selle Royal Vivo Ergo saddle for grip and comfort on long rides.

Technology and Design

  • MonkeyLink Ready: Quick-connect system for lights and fenders—snap-on, snap-off convenience.
  • Class-1 eBike: Pedal assist up to 20 mph, trail-legal and ready for all-day exploration.

Key Takeaway

  • The Copperhead EVO AM 4 750 is built for serious riders who want pro-level performance in a smart, stylish, and rugged package. From bike park laps to backcountry missions, this eMTB is ready when you are.
Frame Size 41(CM) 44(CM) 48(CM) 54(CM)
Seat Tube Length A 410mm 440mm 480mm 540mm
Top Tube Length B 630mm 630mm 640mm 665mm
Chain Stay Length C 445mm 445mm 445mm 445mm
Bottom Bracket Offset D 5mm 5mm 5mm 5mm
Head Tube Length E 120mm 120mm 130mm 140mm
Head Tube Angle α 66° 66° 66° 66°
Seat Tube Angle β 75° 75° 74° 74°
Standover Height 800mm 830mm 860mm 890mm
Wheelbase 1237mm 1237mm 1244mm 1269mm
Reach 465mm 465mm 467mm 489mm
Stack 615mm 615mm 624mm 633mm

Customer Reviews

Based on 4 reviews
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Brian Perla
Monster Truck Coming Through

Been on the Copperhead Evo 4 AM for a few months now and it is a beast. The terrain around me is very rocky and you really need good equipment to rely on. This monster rolls over everything. A couple of things that stand out to me:
• The Magic Mary / Big Betty tires get pinched, stabbed and smashed all day and maintain effortless performance.
• The bike does not rattle or squeak no matter how rocky the downhill. Very well built.
• The 4 main modes for the CX motor are really well programmed. (mapped?) The emnt bike purple default color specifically. I can feel it pull a bit more when I ask for it and let off when I don't all through just pedaling.
• Haven't missed a single shift yet.

I use it daily and it melts stress away like a monster truck rolling through the forest. Nimble for its size and weight, sturdy enough for the rough stuff and really in the end, a fun factory.

D
Doug Travis
Love my AM-4-750!

I’ve had my Bulls AM-4 for almost a year now. It’s been everything I expected and more. After moving to NW Arkansas, I knew I would be needing an E-MTB. After researching many, I landed on the Bulls. Amazing specs for the money. It wasn’t a very hard decision in the end. Fantastic bike! Love it, and can’t ride it enough.

K
Keith K in Colorado Springs
1 year+ REVIEW of my BULLS COPPERHEAD EVO AM4 What a fantastic value

Right out of the box the BULLS COPPERHEAD AM4 shined with quality build and components and was giddy on the 1st ride and every ride since then. I live in Colorado Springs and ride everywhere, the more technical and long riding the better. I would say I ride this bike more like a enduro bike and put it through its paces. With the BOSCH SMART FLOW drive and 750WH battery I get peace of mind on reliability and ease of use and never had range anxiety and usually shoot for a 20-45 mile rides, Bosch did a fantastic job designing a system that can read the riders input to power output. I usually ride with groups of other eMTBs riding many different makes and see the challenges there bikes give them that usually cost more then the BULLS. Some of the components like SR SUNTOUR are more known as a entry level components, but they raised the bar building a higher end lineup offering that the AM4 has and gives a fantastic well planted ride. The Shimano 12 speed has always been buttery smooth and I shift a lot. Brakes have always performed great no complaints. Dropper seat post has also been great if your riding technical is a must. The stock seat was great but as a 68 older gent spending over 60 years riding I did upgrade to a ERGON seat for my undercarriages comfort. The stock tires I did convert to tubeless and the stock tires hook like they are on rails. I ride with others that some of there bikes cost 3x that of the BULLS AM4 and kicks hinny over the competition for the money. For the money the COPPERHEAD is a fantastic bike and if BULLS want to cut me a great deal I would consider buying another to have for friends that want to ride along. I also have let friends ride my COPPERHEAD AM4 that now have also now joined the BULLS family.

G
Greg H.
The e-bike for an elevating experience!

Bulls markets the Copperhead EVO AM 4 750 as their top shelf all-mountain e-bike, and they couldn’t be more right!  My Copperhead e-bike exhibits high-performance, especially when I want it most, going uphill, and need it most, going downhill.

Historically, my riding experience has been riding down the most challenging trails.  However, with my Bulls full-suspension e-bike, not only can I ride downhill on advanced trails, but I have reached new milestones with endurance, confidence and comfort on a durable frame having industry leading components for more efficient uphill riding.

While fatigue is no longer a limiting factor, my riding style has evolved to include goals for taking my riding experience to higher elevations and greater distances.  My Bulls e-bike has taken me on adventures up over a mile high, and up to 50 mile-long aggressive trails rides from a single battery charge—on longer routes I run the bike on either ECO and/or OFF modes during flat or downhill waypoints to extend my battery’s life, but of course I run TURBO modeat all other times!  Now my rides are only limited to my degree of adventure or time.

Bulls did right by incorporating the industry’s best components on their Copperhead e-bike’s durable frame.  Bosch’s premium CX motor is as powerful in reducing my strain uphill as it is in assisting in my endurance to reach further trails.

As always, Shimano has given me confidence in ease & precision of shifting gears up steep inclines and ultra smooth braking for safer deceleration, but more so with Bulls inclusion of Shimano’s 12-speed XTR line drivetrain and large 203mm front & rear hydraulic disc brakes.

Bulls included Schwalbe’s Magic Mary/Big Betty combo.  Not only are they a good pair of tires, but I prefer mullet setups, because the rear wheel’s smaller diameter rotates the center of gravity & level of the bike back and to the rear, giving my fork a slacker angle on the downhill.  The downfall of having more slack riding uphill is negligible with Bosch’s signature motor.

Bulls inclusion of industry leading components into the design of their Copperhead e-bike and their amazing customer service are what put Bulls on my radar for future purchases and becoming a loyal customer of theirs—sorry T**k, you were good to me over the past 25 years…thank you, next.