Mountain bike for fells and forests - Rock Machine Avalanche electric fatbike

The Rock Machine Avalanche E90 is a top-of-the-line electric fatbike suitable for both experienced and beginner mountain bikers.. This powerful and versatile orange vehicle is equipped with a modern aluminum frame and a Shimano STePS EP8 motor. We have tested Rock Machines in customer use and ourselves during the winter and have found the bike to be excellent for all-around use.

Main components

Shimano Steps EP8 electric assist system

504 Wh Darfon battery
Shimano Deore drivetrain
Hydraulic disc brakes
100 mm RockShox Bluto suspension fork
26 x 4.8″ Jumbo Jim tyres
Lightweight and durable aluminium frame

The Avalanche E90 is designed for all those interested in mountain biking, especially beginners. The bike is excellent for both summer and winter off-road riding, and its easy maintenance makes it an attractive option for everyday use as well.

Is an electric fatbike good?

An electric fatbike is an excellent choice for various purposes, such as off-road adventures, touring, and even everyday use. Its electric assistance makes steep hills easier and helps with endurance on longer rides. On the other hand, the heavier weight of an electric fatbike compared to its non-electric counterpart can be a disadvantage in some situations, and the relatively high purchase price of a new bike may limit its acquisition.

Compared to a full-suspension bike, a fatbike is easier to ride at slow speeds, but at higher speeds, a full-suspension bike is a better option. The excellent grip of a fatbike combined with the ease of riding makes an electric fatbike an excellent choice for beginner mountain bikers to tackle even more challenging trails.. Commuters will appreciate the fat tires when faced with a solid 10-15cm of slush on the ground and commuting to work.


  • Powerful motor and good battery life enable long rides
  • Excellent grip and ride comfort
  • Especially suitable for beginner mountain bikers
  • Easy maintenance of a hardtail bike
  • Year-round usability


  • Relatively high purchase price when new

  • Heavier weight compared to traditional bikes

  • In cold conditions, the cold battery needs to be warmed up before charging


Although an electric fatbike also has its downsides, its versatility and ease of use make it an excellent investment for anyone looking to explore the world of mountain biking or seeking one bike for year-round use in all situations. The Rock Machine Avalanche E90 offers a strong combination of performance, reliability, and comfort, making it an excellent choice for both beginners and more experienced riders.

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