Bikes up to 60% offWe monitor over 40,000 bikes daily to find the best prices

Today’s Deals

2023 Borealis

KEYSTONE ELITE GX ⚡

A 26″ aluminum frame hardtail trail e-bike with high-end components.

Manufacturer Price

$6,500
Weight56.0 lbs  
FrameAluminum
SuspensionHardtail, 120mm
ForkManitou Mastodon Pro
Wheels26″ Aluminum
Drivetrain1 × 12 Electronic
GroupsetGX Eagle Transmission
MotorShimano 500W 85Nm mid-drive
BatteryShimano 630Wh
BrakesSRAM G2 RS Hydraulic Disc
SeatpostDropper
Where to Buy
Similar Bikes
Top Comparison
Insights
Ride Feel

Based on frame geometry and build specs.

Terrain
easyextreme
Handling
nimblestable
KEYSTONE ELITE GX ⚡
Other Trail bikes
Gearing

A bike with lower gearing will be easier to ride up steep hills, while a higher top end means it will pedal faster down hills.

Lowest gear

(climbing)

28 mph

KEYSTONE ELITE GX ⚡

26 mph

Similar Bikes

Highest gear

(descending)

Spec Level

Based on build material and quality level of the frame, fork, wheelset, groupset, suspension system, and more.

Sizing
SM

5'2" – 5'6"

MD

5'5" – 5'10"

LG

5'9" – 6'3"

XL

6'0" – 6'6"

🐐 Estimated

Rider Fit Notes

None yet.

Do you have this bike? Help other riders make a decision about which size will work for them by sharing your own size and fit notes.

Reviews
Electric Bike Review
Borealis Keystone Review: A Go-Anywhere, Do-It-All Fat Bike

Feb 2025

Check out our Borealis Keystone review and see how it breaks the stereotypes with fun handling, great components, and fat bike capability!

Observations
  • That Shimano EP8 motor paired with massive 5-inch tires creates a combo that'll crush any terrain you throw at it. I was able to cover 38 miles on MAX assistance, which means you can plan epic adventures without stressing about range.

  • Running those fat tires at just 10 PSI delivers a ride quality that rivals full-suspension rigs, even on this hardtail frame. The Manitou Mastodon fork with 120-140mm adjustable travel is almost overkill with how plush these tires ride.

  • The SRAM GX Eagle AXS wireless shifting and 10-52t cassette range means you're never hunting for gears, even on technical climbs. That 69° head tube angle might sound steep on paper, but it gives this fatty some surprisingly playful trail manners.

  • At 56 pounds, this isn't winning any lightweight contests, but it's impressively nimble for a bike in this category. Three mounting points for racks and gear mean you can load your gear up while maintaining that planted feel from the 1223mm (48 inch) wheelbase. See Latest Price

Read Review

Electric Bike Report
Borealis Keystone Review | Where Can’t It Go?

Aug 2024 · Griffin Hales

A Unique, Premium Ride That Is Rugged and Capable for XC & Trail Riding in Any Weather For some, trail or XC mountain biking is a fair-weather-only activity. Fighting the muck after some rain might not sound like a joyride. For others, local trails may not be the most conducive to riding if you live

Highs
  • You can ride in all sorts of weather/conditions. A true fat tire eMTB is a unique e-bike to find.

  • The Shimano motor feels like the EXACT right pairing for this bike. Powerful, but not overpowering, motor assistance that’s intuitively accessed when pedaling.

  • Terrific handling. The bike feels lighter than expected. It maneuvers better going up and over stuff.

  • There are a ton of desirable performance features you don’t often see stock on fat bikes, like electronic shifting, a carbon handlebar, or the Mastodon fork.

  • Available in four frame sizes – it’ll be easier to find the right fit.

  • It’s really nice to pick the tire and rim size that’ll match your needs.

Lows
  • It has a high overlanding/camping/adventuring potential, but those types of accessories are limited through Borealis’s website.

  • The tires and fork might make the ride feel bouncy for newer riders on technical sections.

Read Review

Geometry
Specs
Build
Frame

Borealis Keystone Aluminum 15", 17", 19", 21"

Hanger StandardUDH

ColorGunmetal Grey with Cobalt Blue Graphics

Fork

Manitou Mastodon PRO EXT 120mm, 51mm offset

Travel120mm

Headset

FSA w/ Star Nut

Stem

Borealis 50mm

Handlebar

Borealis Carbon

Saddle

WTB Volt Medium Steel

Seatpost

KS Lev Integra 125mm (SM, MD) / 150mm (LG, XL)

TypeDropper

Grips

Ergon GP1

Groupset
Rear Derailleur

SRAM GX Eagle Transmission Derailleur

Crank

SRAM Eagle Transmission E-Bike MTB Chainring 104 BCD 36T Steel

Shifters

SRAM AXS Pod Contoller Right Bridge w/ MMX Clamp for GX Eagle Transmission

Cassette

SRAM GX Eagle Transmission Cassette 10-52T

Chain

SRAM GX Eagle Transmission Flattop Chain

Brakes

SRAM G2 RS

TypeSRAM G2 RS Hydraulic Disc

Wheels
Rims

Your choice of SunRingle Mulefüt SL - 26x80, 27.5x80, or 27.5x65

Spokes

Straight Gauge 2.0 Black

Front Hub

Borealis Gen 4 15x150 / 12x197

Rear Hub

Borealis Gen 4 15x150 / 12x197

Tires

Terrene Cake Eater 26x4.0 Light

Disc Rotors

SRAM HS2 200mm front / 180mm rear

Electric Components
Motor

Shimano DU-EP800

Battery

Shimano BT-E8036 (630Wh)

Display

Shimano SC-EM800

Rider Notes
Riders Also Viewed

First added August 30

Last updated September 10

Not listed for 1,001 days