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Bulls E-Core Di2 FS 27.5+

Bulls E-Core Di2 FS 27.5+
Black Matt
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Maybe you didn't need a chairlift in the first place. The crazy rollers, drop after climb, after drop after climb, are more your vibe and you're not averse to some vertical punishment. The E-CORE Di2 FS 27.5+ electric all mountain bike takes you there, minus a lot of that punishment you pretend to like.

Integration is this bike's middle name (but we only use it when it's in trouble). The 500Wh power pack is integrated seamlessly into the the downtube. The Shimano Di2 XT electronic shifters are integrated with the battery, eliminating the need for a separate battery and the risk of running out of juice for shifting when you need it most.

Your plush ride is thanks to 150mm of Rock Shox Yari in the front and Deluxe RL Air in the rear. The assist controls are integrated into the shift mechanism that would control a front derailleur on a 2x, so operation is intuitive. Magura MT-5/MT-4 brakes stop your momentum, but not the fun.

Electronic drivetrain systems deliver excellent shifting, easy set up, and solid battery life. Here are the highlights of today’s electronic shifting systems:

Shifting Performance
Electronic shifting systems use powerful servomotors to rapidly shift the chain. Because microprocessors and sensors constantly monitor every aspect of the system, they shift with precisely and without chain rub.

Many major systems have customizable shifting. Some have the ability to add remote shifters for common riding positions, and some even allow you to change the functions of the shifting buttons.

Electronic groupsets are responsive and consistent. There are no cables to stretch and wear out, so you get a flawless shift every time. The added bonus is you’ll never have to replace a derailleur cable ever again.

Dropper posts

A dropper seatpost allows you to quickly lower and raise your seat to give you an ideal riding position. Dropping your seat creates a lower center of gravity for better control and maneuverability on steep descents, while raising it puts you at normal riding height for efficient pedaling.

Construction can include either hydraulic- or cable-actuated systems and the post’s travel can either be infinitely adjustable or stopped at set intervals, depending on the model.

Dropper seatposts come in standard lengths and diameters and vary by the amount of travel.

Plus-size rims and tires

Wider than standard yet narrower than fat, plus-size rims and tires hit the sweet spot in grip, stability, and speed, giving you more confidence on technical terrain. Compared to a standard tire you’ll feel grip in places you wouldn’t expect thanks to a bigger contact patch and greater rollover clearance. More air volume allows lower tire pressures which softens bumps and increases float on sand or snow. Whether you’re a novice or an expert, the benefits of plus-size tires and rims will amplify your mountain biking fun.


Motor Shimano Steps E8000 250W
Battery 36V/14Ah/500Wh
Max Assisted Speed 20mph
Frame 7005 Aluminum
Fork Rock Shox Yari RC 27.5+ Solo Air, 150mm, 15mm thru axle
Rear Shock Rock Shox Deluxe RT, 150mm
Rims/Wheels BULLS Eccentric 35, tubeless ready
Tires Schwalbe Nobby Nic 70-584, 27.5x2.8
Crankset Shimano FC-E8050
Chainrings 38T
Rear Derailleur Shimano Deore XT RD-M8050-GS Shadow Plus
Cassette/Rear Cogs Shimano Deore XT CS-M8000, 11-spd, 11-46T
Shifters Shimano Deore XT Di2 SW-M8050
Handlebars BULLS
Brakes Magura MT5/MT4, hydraulic disc brakes, 180mm/180mm
Pedals Wellgo
Saddle Selle Royal BULLS
Seat Post Rockshox Reverb Stealth 100mm

* Subject to change without notice.

Part Numbers

Option MPN
Black Matt / 44cm 776-48044
Black Matt / 49cm 776-48049
Black Matt / 54cm 776-48054