Descending
56
A solid all-round descender (66° head angle, 140mm) — capable in the rough and steep without being an all-out bruiser.
Bulls
Sonic EVO AM-SL 2023
Discontinued✎Full Power · TrailLegacy · 1/10iFreshness 1/10
How current the bike is — newer chassis, motor and battery score higher. 10 = brand-new, 0 = legacy.
How current the bike is — newer chassis, motor and battery score higher. 10 = brand-new, 0 = legacy.
Motor
Shimano EP6 (DU-EP600) · 85Nm · 500W↗
Battery
Bulls V10 Light Core 750Wh
Travel F/R
140/140mm
Wheels
29F / 29R✎
Frame
Full carbon✎
Weight
20 kg
Price
From €5,199
EMTB Forums verdict
The 2023 Bulls Sonic EVO AM-SL is the lightweight all-mountain branch of the Sonic EVO family: a full carbon 140/140mm 29er built around a Shimano motor and a 750Wh battery housed in a carbon casing with no separate cover. It is distinct from the full-power Sonic EVO AM and from the 160mm Sonic EVO EN-SL enduro sibling. The bike is discontinued, sold only as a 2023 model year.
The lineup ran four trims. The entry SL 1 pairs the alloy-bodied Shimano EP6 (85Nm) motor with a BULLS Lytro 35 Supreme Air fork, SR Suntour Edge Plus 2CR shock and an 11-speed Deore drivetrain at a claimed 22kg. The SL 2 and SL 3 step up to the Shimano EP801 motor with Deore XT Di2 LinkGlide shifting and RockShox suspension, while the range-topping SL-I uses RockShox Lyrik Ultimate, SRAM XX1 Eagle AXS and Mavic carbon wheels at a claimed 20kg.
Geometry is shared across every trim and stays moderate rather than aggressive: a 66 degree head angle, 75.5 degree seat angle, 450mm chainstays at all sizes and reach growing 430mm to 490mm across S to XL. All sizes run 29in wheels front and rear.
Pricing was set in euros for the German market, from 5,199 euros for the SL 1 up to 10,199 euros for the SL-I. There was no UK GBP recommended retail price.
Geometry read
What the numbers mean on the trail
Computed from this bike's geometry, spec and build kit — reach, wheelbase, chainstay, head and seat angles, travel, motor, weight and the fork/tyre/brake spec — and worked out per size, because a fixed chainstay can make an S and an XL feel very different.
Size
Playfulness
87
Short 450mm rear and a lighter build — easy to pop, manual and throw around.
Size balance
93
Rear-long with a planted front in L (FC:RC 1.75) — easy to weight the front and quick to turn, though it can feel light at the back at real speed.
Technical climbing
75
Shimano EP6 (DU-EP600) and a steep 75.5° seat angle keep the weight planted over the front — a proper winch. 500W of peak power and 85Nm of torque — a strong full-power motor.
Easy to throw around; happiest when you're active on the bike.
The numbers are well balanced for its category.
How it stacks up vs other Full Power · Trail bikes (from 245 bikes in the database)
Weight20 kg3.0 kg lighter than average
Battery750 Whabout average capacity
Motor torque85 Nm13 Nm below average
Computed from geometry + spec, not a paid review. Scores are guidance, not gospel.
Geometry · hover a row to highlight the measurement on the bike
| S | M | L | XL | |
|---|---|---|---|---|
| Reach | 430 mm | 450 mm | 470 mm | 490 mm |
| Stack | 628 mm | 628 mm | 637 mm | 646 mm |
| Seattube | 410 mm | 440 mm | 470 mm | 510 mm |
| Chainstay | 450 mm | 450 mm | 450 mm | 450 mm |
| Headtube Angle | 66° | 66° | 66° | 66° |
| Seattube Angle (eff) | 75.5° | 75.5° | 75.5° | 75.5° |
| Wheelbase | 1194 mm | 1214 mm | 1238 mm | 1262 mm |
| Headtube | 120 mm | 120 mm | 130 mm | 140 mm |
| BB Height | 344 mm | 344 mm | 344 mm | 344 mm |
| Front Centre | 744 mm* | 764 mm* | 788 mm* | 812 mm* |
| FC:RC | 1.65 | 1.70 | 1.75 | 1.80 |
Trims · 4
1 €5,199 | 2 €6,199 | 3 €7,199 | I €10,199 | |
|---|---|---|---|---|
| Motor | Shimano EP6 (DU-EP600) · 85 Nm | Shimano EP801 · 85 Nm | Shimano EP801 · 85 Nm | Shimano EP801 · 85 Nm |
| Battery | Bulls V10 Light Core 750Wh · 750 Wh · all trims | |||
| Travel F/R | 140/140 mm · all trims | |||
| Frame | Carbon · all trims | |||
| Fork | BULLS Lytro 35 Supreme Air LOR, 1.8 Steerer, Boost, 140mm | RockShox 35 Gold RL, 1.8 Steerer | RockShox Lyrik Select RC, 1.8 Steerer | RockShox Lyrik Ultimate RC2, 1.8 Steerer |
| Shock | SR SUNTOUR Edge Plus 2CR | RockShox Deluxe Select+ RT | — | RockShox Deluxe Ultimate RCT |
| Headset | acros AZX-262 310.52.570R1 · all trims | |||
| Stem | BULLS MTB-SLS, CCS Slot Mount ready · all trims | |||
| Handlebar | BULLS Sport-SL CCS | BULLS Sport-SL CCS | BULLS Enduro Carbon | BULLS Enduro Carbon |
| Grips | — | — | Proxim Enduro | — |
| Saddle | prologo Proxim 400 | prologo Proxim 400 | prologo Proxim 450 Sport | prologo Proxim W850 Carbon |
| Seatpost | Limotec Alpha 1 dropper, 34.9 (S: 100mm, M: 125mm, L/XL: 150mm) | Limotec Alpha 1 dropper, 34.9 (S: 100mm, M: 125mm, L/XL: 150mm) | Crankbrothers dropper post | Eightpins Dropper Post |
| Brakes | Shimano BR-MT420 hydraulic disc, 4-piston | Hydraulic Disc Brake | SHIMANO BR-M8120 | Hydraulic Disc Brake |
| Rear derailleur | SHIMANO Deore RD-M5100 shadow+ | SHIMANO Deore XT Di2 RD-M8150 shadow+ | SHIMANO Deore XT Di2 RD-M8150 shadow+ | SRAM XX1 Eagle AXS |
| Crank | E-Thirteen | E-Thirteen | E-Thirteen | e*thirteen Carbon |
| Shifters | SHIMANO Deore SL-M5100 with I-Spec EV | SHIMANO Deore XT Di2 LinkGlide SL-M8150, rapidfire+, I-spec-EV | SHIMANO Deore XT Di2 LinkGlide SL-M8150, rapidfire+, I-spec-EV | SRAM Eagle AXS Rocker controller |
| Cassette | SHIMANO Deore 11-speed, 11-51T | SHIMANO Deore LinkGlide 11-speed, 11-50T | SHIMANO SLX 12-speed, 10-51T | SRAM XG-1299 Eagle 12-speed, 10-52T |
| Chain | SHIMANO CN-HG601-11, 11-speed | SHIMANO LinkGlide CN-LG500 | SHIMANO LinkGlide CN-LG500 | SRAM XX1 Eagle |
| Drivetrain | SHIMANO Deore RD-M5100 shadow+; E-Thirteen; SHIMANO Deore SL-M5100 with I-Spec EV; SHIMANO Deore 11-speed, 11-51T; SHIMANO CN-HG601-11, 11-speed | SHIMANO Deore XT Di2 RD-M8150 shadow+; E-Thirteen; SHIMANO Deore XT Di2 LinkGlide SL-M8150, rapidfire+, I-spec-EV; SHIMANO Deore LinkGlide 11-speed, 11-50T; SHIMANO LinkGlide CN-LG500 | SHIMANO Deore XT Di2 RD-M8150 shadow+; E-Thirteen; SHIMANO Deore XT Di2 LinkGlide SL-M8150, rapidfire+, I-spec-EV; SHIMANO SLX 12-speed, 10-51T; SHIMANO LinkGlide CN-LG500 | SRAM XX1 Eagle AXS; e*thirteen Carbon; SRAM Eagle AXS Rocker controller; SRAM XG-1299 Eagle 12-speed, 10-52T; SRAM XX1 Eagle |
| Wheels | RODI Tryp 30, tubeless ready | MAVIC Crossride 29 CL | — | MAVIC Crossmax Carbon XLR |
| Tyres | SCHWALBE Nobby Nic Performance, folding | SCHWALBE Nobby Nic Performance, folding | SCHWALBE 62-622 (29 x 2.4) | SCHWALBE Nobby Nic Evo Super Ground TLE |
| Weight | 22 kg | — | — | 20 kg |
| Price | €5,199 | €6,199 | €7,199 | €10,199 |
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