Borealis Keystone - Electric Bike⚡

Name: Borealis Keystone - Electric Bike⚡
Brand: Borealis

2025 MountainTrail Electric bicycle Manufacturer page

Borealis Keystone - Electric Bike⚡, color Gunmetal Grey with Cobalt Blue Graphics

Last known price: $6,199

Prices shown first for United States
Fork travel: 120 mm
Wheels: 27.5″
Drivetrain: 1 × 12 36t / 10–52t
Gear range: 520%
Battery: 630 Wh
Weight: 25.4 kg 56.0 lb · Reference configuration not specified
Frame: Aluminum
Brakes: Hydraulic disc

Rider height by size (cm)

Size guide

SM 157.5–167.6
MD 165.1–177.8
LG 175.3–188
XL 185.4–195.6

Components

20 of 23 identified

Parts found in a manufacturer catalog show their brand, model and key numbers, and the steps show how precisely they are identified: brand, series, model, or the exact product. The info button has every detail and the text the manufacturer published.

Frame and fork

1 part

Frame

Borealis Keystone Aluminum 15", 17", 19", 21" Not identified

Electric system

3 parts

Suspension

1 part

Fork
- Manitou

Drivetrain

5 parts

Brakes

2 parts

Wheels and tires

5 parts

Front hub
- Borealis
Rear hub
- Borealis
Rims
- Sun Ringlé
Spokes

Straight Gauge 2.0 Black Not identified
Tires

Your choice. All tire options are listed online. Not identified

Cockpit and contact points

6 parts

Sizes and geometry

4 sizes Open in the geometry plotter

Enter your height to highlight matching ranges.

Size MD

Table

Reach 435mm

Stack 688mm

Wheelbase 1207mm

Head angle 69.0°

Seat angle 73.0°

Every size is drawn to the same scale, in millimeters. Explanatory schematic on an assumed 27.5″ wheel; exact published values are in the table below.

Size Reported by the manufacturer

Complete manufacturer geometry table 4 published sizes

Complete manufacturer geometry by size
Measurement
Reachmm	420	435	445	446
Stackmm	688	688	702	716
Top tube lengthmm	630	645	660	665
Seat tube lengthmm	381	432	482	533
Head tube lengthmm	160	160	175	190
Head tube angle	69°	69°	69°	69°
Seat tube angle	73°	73°	73°	73°
Chainstay lengthmm	480	480	480	480
Wheelbasemm	1187	1207	1223	1229
Front centermm	713	733	749	755
Bottom bracket dropmm	60	60	60	60
Bottom bracket heightmm	295	295	295	295
Fork rakemm	51	51	51	51
Trailmm	87	82	81	82
Stack/reach ratio	1.64	1.58	1.58	1.61

Not published by the manufacturer: Standover height, Front travel, Rear travel, Crank length, Handlebar width, Stem length, Stem angle, Seatpost length and Dropper post travel.

Specifications

Frame and fork

Intended fit: Unisex
Frame material: Aluminum
Bicycle weight: 25.4 kg

56.0 lb

Suspension

Suspension configuration: Hardtail
Front travel: 120 mm

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 36
Largest chainring: 36
Rear sprockets: 12
Smallest sprocket: 10
Largest sprocket: 52
Lowest gear: 19.0 in
Highest gear: 99.0 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic disc

Fit and controls

Derailleur hanger: UDH
Seatpost: Dropper seatpost
Shifting: Electronic

Electric system

Battery capacity: 630 Wh

Additional specifications

Battery: Shimano BT-E8036 (630Wh)
Wheel material: Aluminum
Wheel size: 27.5″

Technical analysis

4 measures

How these figures sit among bicycles of the same class and model year. Context, not a ranking.

Front travel

120 mm

This value is within the central range for this class.

Cohort: Mountain / Trail Model year: 2025
Sample: 1,810 bicycles with this information
Coverage: 97.5% of the class

Lowest gear

19.0 gear inches

This value is within the central range for this class.

Cohort: Mountain / Trail Model year: 2025
Sample: 1,384 bicycles with this information
Coverage: 74.6% of the class

Highest gear

99.0 gear inches

This value is above the central range for this class.

Cohort: Mountain / Trail Model year: 2025
Sample: 1,384 bicycles with this information
Coverage: 74.6% of the class

Shifting

Electronic

388 of 1,849 bicycles with this information use electronic shifting.

Cohort: Mountain / Trail Model year: 2025
Sample: 1,849 bicycles with this information
Coverage: 99.6% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 7.3 km/h
Highest gear: 37.9 km/h

Total gear range 520%

Technical details and class reference

These speeds describe the gearing at the selected cadence, not how fast you can ride.
Calculated from published gear-inch values and their wheel-size assumptions.
These gearing values describe the bicycle, not a selected frame size.
A 100% range means one ratio; 500% means the highest ratio is five times the lowest.
For e-bikes, motor assistance cutoff is not represented.

Gear-inch range

Lower gear-inch values travel less distance per pedal revolution; higher values travel farther.

This bicycle: 19.0–99.0 gear inches
Class reference (p10–p90): 17.1–98.6 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Mountain / Trail Model year: 2025
Lowest gear: 1384 bicycles with this information, 74.6% of the class
Highest gear: 1384 bicycles with this information, 74.6% of the class