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Bull E-Stream EVO AM4
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Read the Review
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Awards  Editors' Choice Award  Top Pick Award Top Pick Award 
Price $5,299 List$5,975 List$5,399 List$5,999 List$6,525 List
Overall Score Sort Icon
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79
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Pros Smooth and consistent power output, modern geometry,Outstanding battery life, whisper quiet motor, just right geometry, intuitive operationGood controls, huge distance range, confidence inspiring at speed, good component specVery nice build, stealthy looks, hard-charging downhill performanceLightweight for an e-bike, normal trail bike feel, range extender battery, quiet motor
Cons No digital display, wimpy tires and fork, center of gravity feels highReadout display not standard feature, SRAM Guide brakes not powerful enough, reported motor failuresHeaviest in test, sluggish at low speedsExpensive, sluggish handling at times, came setup with tubes in tiresLess battery storage capacity, less powerful drive unit, expensive
Bottom Line Rocky Mountain came close with the Instinct Powerplay Alloy 50 but they made several questionable component choices and the controls need improvementThe 2020 Specialized Turbo Levo Comp checks in for the third consecutive time as Editor's Choice thanks to class-leading range, power and innovationConfidence and stability, the Bulls E-Stream EVO AM 4 likes to party and can do so for a long time thanks to its large battery and distance rangeThe enduro-oriented YT Decoy is capable of charging the descents as hard as you wantThe new Turbo Levo SL splits the difference between a regular trail bike and a full-power e-bike
Rating Categories Instinct Powerplay Alloy 50 Specialized Turbo Levo Comp Bulls E-Stream EVO AM 4 YT Decoy CF Pro Turbo Levo SL Comp
E Bike Controls (10%)
6
7
7
8
7
Downhill Performance (35%)
6
9
8
9
9
Climbing Performance (20%)
7
9
8
7
8
Power Output (15%)
7
8
9
8
7
Distance Range (20%)
8
10
9
7
7
Specs Instinct Powerplay... Specialized Turbo... Bulls E-Stream EVO... YT Decoy CF Pro Turbo Levo SL Comp
Battery Size (Wh) 500Wh 700Wh 650Wh 540Wh 320Wh (+160Wh Range Extender)
Wheel size (inches) 29 29 27.5+ 29 front/27.5+ rear 29
Motor System Dyname 3.0 250w Specialized 2.1, Custom Rx Trail-tuned 250W Brose Drive S (250W) 650Wh Shimano Steps E8000 Specialized SL 1.1 (240W)
Motor Power (torque) 108Nm 90Nm 70Nm 35Nm
Measured Weight (w/o pedals, Medium) 52 lbs 4 oz 50 lbs 7 oz 55 lbs 15 oz 50 lbs 10 oz with tubes 41 lbs 10 oz (2lbs 6 oz - range extender battery)
Fork RockShox Reba RL E-Bike 140mm RockShox Lyrik Select RC DebonAir RockShox Lyrik RC Boost Solo Air 150mm Fox 36 Float Performance Elite E Fox Rhythm 34 Float 150mm
Suspension & Travel Ride 9 Adjustable Future Shock Rear (FSR) - 150mm RockShox Deluxe RT 150mm V4L Virtual 4-Link 165mm Future Shock Rear (FSR) - 150mm
Shock RockShox Deluxe Debonair RT RockShox Deluxe Select+ RockShox Deluxe RT Fox Float DPX2 Performance Elite Fox Float DPS Performance
Frame Material FORM Alloy M5 Premium Aluminum Aluminum Carbon Fiber M5 Premium Alloy
Frame Size Tested Medium Large Large Medium Large
Available Sizes S-XL S-XL 44/49/54 cm S-XXL XS-XL
Wheelset Sun Duroc SD37 Roval Traverse 29, 30mm internal Formula Hubs/Bulls Rims E*Thirteen E*Spec Plus Roval Traverse 29, 30mm internal
Front Tire Maxxis Rekon EXO 2.6" Specialized Butcher GRID GRIPTON 2.6" Schwalbe Magic Mary Snakeskin, TLE, Apex, 27.5 x 2.8 Maxxis Minion DHF EXO 29" x 2.5" Specialized Butcher GRID TRAIL GRIPTON 2.3"
Rear Tire Maxxis Rekon EXO 2.6" Specialized Eliminator BLCK DMND 2.3" Nobby Nic Snakeskin, TLE, Apex, 27.5 x 2.8 Maxxis Minion DHR II EXO 27.5" x 2.8" Specialized Eliminator GRID TRAIL 2.3"
Shifters SRAM GX-1E SRAM S700 11-speed Shimano Deore XT SL-M8000 Shimano XT 11-speed SRAM NX Eagle
Front Derailleur N/A N/A N/A N/A N/A
Rear Derailleur SRAM NX 11-speed SRAM GX, 11-speed Shimano Deore XT RD-8000-GS, 11-speed Shimano XT 11-speed SRAM NX Eagle
Crankset Race Face Ride Cinch 34T Praxis SR Suntour 38T + Miranda Shimano XT Praxis M30
Crankarm length 165mm not specified, but at least 170 165mm 170mm
Bottom Bracket Race Face BB92 not specified not specified part of the motor
Cassette SunRace CSMX8 11-46T SRAM PG-1130 11-42t Shimano SLX CS-M7000-11 , 11-speed, 11-42T E*Thirteen TRS Plus SRAM NX Eagle 11-50T
Chain KMC X11-1 KMC X11ET KMC X11E not specified SRAM NX Eagle
Saddle WTB Volt Race Specialized Bridge 155 S2 Selle Royal Seta M1/Bulls SDG Radar Mountian Specialized Bridge Comp
Seatpost Race Face Aeffect Dropper X-Fusion Manic 150mm KS LEV-Integra SDG Tellis 150mm X-Fusion Manic 150mm (large)
Handlebar Rocky Mountain AM 760mm Specialized Trail 780mm Bulls Renthal Fatbar 35 800mm Specialized Trail 780mm
Stem Rocky Mountain AM Specialized Trail Monkey Link Renthal Apex 35 40mm Specialized Trail
Brakes SRAM Guide T SRAM Guide RE 4 piston 200mm rotors Magura MT5 hydraulic disk brakes SRAM Code RS SRAM Guide R
Grips Rocky Mountain Lock On Light Specialized Sip Grip Ergon ODI Elite Motion Specialized Trail
Measured Effective Top Tube (mm) 590 630 638 590 625
Measured Reach (mm) 446 460 435 435 454
Measured Head Tube Angle 66 66 67 65.5 High/65.0 Low 66
Measured Seat Tube Angle 75.9 74.7 74 76.5 High/76 Low 74.5
Measured Bottom Bracket Height (mm) 342 347 354 340 Low 350
Measured Wheelbase (mm) 1194 1235 1230 1205 1218
Measured Chain Stay Length (mm) 448 455 462 443 437
Warranty Five Years on frame Lifetime Five Years on frame Lifetime
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