The 2021 Bulls E-Stream EVO AM e-MTBs are charging to the trail heads with an updated Brose S-MAG motor packing a massive downtube-integrated 750Wh battery. Now in their 6th generation, you can expect a large power output and long range from these new full suspension e-bikes. No geometry updates for this model year but Bulls have added a frame size at the smaller end to make this high capacity e-bike more accessible.
Bulls E-Stream EVO AM
The 2021 Bulls E-Stream EVO AM is a full suspension e-MTB packing a high torque motor and high capacity integrated battery. The aluminium frame boasts 150mm of rear wheel travel paired with a 150mm fork. That travel places it firmly in the all-mountain category, as does its conservative geometry.
Angles on the E-Stream aren’t overly aggressive by any means, with a 67.5° head angle and 74° seat tube angle. Reach is conservative too, spanning a 421mm to 465mm range over the four frame sizes. Chainstays are long at 460mm, ensuring ample clearance for 27.5+ tires.
Notable updates for the E-Stream EVO AM include 12 speed drivetrains and 4 piston brakes with 203mm rotors front and rear across the three model range. All are also fitted with the new Brose S-MAG motor…
| Frame Height | 41 cm | 44 cm | 49 cm | 54 cm |
| Seat tube length | 410 mm | 440 mm | 490 mm | 540 mm |
| Head Tube | 110 mm | 110 mm | 125 mm | 140 mm |
| Wheelbase | 1177.0 mm | 1191.0 mm | 1212.0 mm | 1233.0 mm |
| Chain strut | 460 mm | 460 mm | 460 mm | 460 mm |
| Crank Offset | 7 mm | 7 mm | 7 mm | 7 mm |
| Reach | 421 mm | 435 mm | 450 mm | 465 mm |
| Stack | 590 mm | 590 mm | 603 mm | 618 mm |
| Seating angle | 74.0° | 74.0° | 74.0° | 74.0° |
| Steering angle | 67.5° | 67.5° | 67.5° | 67.5° |
Updated Brose S-Mag Motor
The Brose S-MAG (magnesium) is their highest performance e-MTB motor. It boasts a maximum torque of 90 Nm, offering 410% maximum pedal assist. The main update to the the Brose S-MAG motor seen on the 2021 Bulls e-MTBs is the firmware upgrade which is said to optimize performance and smooths out power delivery.
Pricing & Availability
The 2021 Bulls E-Stream EVO AM is available at three price points. The top-end AM 4 gets a FOX Float 36 Rythm Grip fork, Shimano XT drivetrain and 4 pot SLX brakes with Bulls own Eccentric 35mm wheelset.
The AM 3 and 4 are available now at $5799 and $6299, respectively. The budget option AM 2 expected in Spring 2021 is anticipated to be priced at $5399.
