At first glance, the BULLS SIX50 AM2 looks like a bargain. The stylish frame, a high-quality Bosch motor, and good components all come at the fair price of € 4,399. It sounds too good to be true.

For an overview of the test fleet head to the group test: The best eMTB around € 4,500 – 11 exciting and affordable bikes go head to head

BULLS SIX50 EVO AM2 Review
BULLS SIX50 AM2 | 25.22 kg | € 4,399

We had a BULLS SIX50 in our group test in 2014. A lot has changed since then, and except for its name, the bike no longer has anything in common with its predecessor. The new SIX50 AM2 offers 150 mm of travel and rolls on 2.8″-wide SCHWALBE Nobby NIC plus tyres. It’s powered by a Bosch Performance CX motor and a Bosch PowerTube battery with 500 Wh capacity integrated in the downtube. Unlike most other manufacturers, BULLS rotates the motor 45° upwards to line it up with the battery, giving the bike a slimmer silhouette while raising its centre of gravity. The cockpit is well dimensioned with a handlebar width of 750 mm and a 50 mm stem.

  Despite its 150 mm of travel, the BULLS SIX50 AM2 is best kept on forest roads and easy trails!

Unfortunately, however, it looks crowded due to all the levers and cables. The lockout for the fork is unnecessary, both off and on-road, and the Bosch Intuvia display doesn’t contribute to a neat cockpit either. However, its mount offers riders the possibility of upgrading to a Nyon display, as a GPS, for example. One point of criticism is the brakes: the 180 mm rotors are too small, and the MAGURA MT4 caliper on the rear wheel is underpowered for such a heavy bike. An MT5 caliper like the one on the front wheel would have been a better choice. What we did like is the MonkeyLink bracket, which will let you mount front and rear lights quickly and easily. Thanks to the integrated battery, you can also put a water bottle in the front triangle.

The BULLS SIX50 EVO AM2 in detail

Fork BULLS Lytro 35 Boost R-R 150 mm
Rear shock RockShox Deluxe RT 150 mm
Motor/Battery Bosch Performance CX / Bosch Powertube 500 Wh
Drivetrain Shimano Deore
Brakes Magura MT5/MT4 180/180 mm
Seatpost BULLS 120 mm
Stem BULLS Monkey Link 55 mm
Handlebar BULlS 750 mm
Hubs STYX
Rims BULLS AS-35 P
Tires Schwalbe Nobby Nic 2.8″

At first glance, the BULLS SIX50 AM2 looks like a bargain.
Flipped
BULLS tilts the motor towards the battery to give the bike the slimmest possible silhouette
Clattering
In bumpy terrain, the chain regularly hits the pivot point. Besides being very annoying, it chips the paintwork.
Practical
The MonkeyLink bracket makes it possible to clip in an appropriate light within seconds
Underpowered
The MAGURA MT4 brake with a 180 mm rotor isn’t powerful enough for the rear. An MT5 like the front wheel has would have been a better choice.

The geometry of the BULLS SIX50 EVO AM2

Helmet Endura MT500 | Shirt Fox Indicator | Jersey | Shorts Mavic Crossride | Backpack XLC E-Bike-Backpack BA-S82

After a few metres on-board the BULLS SIX50 AM2, it becomes clear what it’s made for: long, relaxed rides in easy terrain. The seating position is upright and very comfortable. Thanks to the long chainstays, the front wheel stays firmly on the ground. The suspension is plush and, together with the plus tyres, simply filters out all roughness. However, you won’t get much feedback from the trail either, and it bottoms out too easily. Active riders won’t be pleased – but those looking for comfort on gravel roads will be. The tall front triangle, the undersized brake,s and the SR SUNTOUR fork, which tends to dive, all provide little confidence on steep descents. With the BULLS, the rider has the impression of sitting more on the bike instead of being integrated between the wheels. The bike isn’t good at cornering either; its sluggish behaviour requiring a lot of strength.

Conclusion

The BULLS SIX50 AM2 is a very comfortable eMTB for long tours. It’s very stable on forest roads and easy trails. In rougher terrain, the bike quickly reaches its limits.

Strengths

– relaxed, comfortable seating position
– mounting a light and a water bottle is quick and easy
– very comfortable

Weaknesses

– cumbersome
– suspension provides little feedback
– brakes not powerful enough

Uphill
Downhill
Stability

Agility
Value


For more information head to: bulls.de

The testfleet

For an overview of the test fleet head to the group test: The best eMTB around € 4,500 – 11 exciting and affordable bikes go head to head

All bikes in test: Conway eWME 627FLYER Uproc 4.10FOCUS JAM² PlusGiant Full-E+ 1.5 Pro LTDHaibike XDURO AllMtn 7.0KTM MACINA KAPOHO 273 11 PT-CX5IMERIDA eONE-SIXTY 800Moustache Samedi 27 Trail 6SCOTT E-Genius 720Specialized Turbo Levo FSR 6Fattie

This article is from E-MOUNTAINBIKE issue #013

E-MOUNTAINBIKE Magazine is published in a digital app format in both English and German. Download the app for iOS or Android to read all articles on your tablet or smartphone. 100% free!


Did you enjoy this article? If so, we would be stoked if you decide to support us with a monthly contribution. By becoming a supporter of E-MOUNTAINBIKE, you will help secure a sustainable future for high-quality cycling journalism. Click here to learn more.

Words: Christoph Bayer Photos: Christoph Bayer, Valentin Rühl