To improve your shopping experience today and in the future, this site uses cookies.
I Accept Cookies

Borealis Keystone eFat Bike 2023 Gray / Blue 27.5 Mule


With Pre-Order, you can purchase the latest items added to our store in advance of them arriving with us.

Your Pre-Order is prioritized (at no additional charge); meaning that as soon as the product arrives with us, we can wrap it straight back up; ready for collection via Click & Collect or dispatch to you — it often never even hits the stock room shelves!


With Prelaunch, the date when we expect to receive the product ourselves is still a little too hazy to be confident in accepting Preorders.

So, instead, you can submit your email address for the item you are interested in, and we will email you as soon as stock arrives in the system.

Estimated Shipping & Collection Dates

Estimated Shipping & Collection Dates are given on Pre-Order and Pre-Launch products. They are for indicative purposes only and can change at any time without notice.

The dates we provide are based on information given by our suppliers. Whenever we get updated information from our suppliers we will endeavor to update the Estimated Shipping & Collection Dates provided on product pages.

We estimate this will be ready for dispatch to you or collection via Click & Collect on Undetermined

Hassle free returns

Returns and Shipping

SHIPPING (Continental U.S.)

  • Orders usually ship one business day after being placed.
  • Please note that some items may be subject to additional shipping and handling charges because of size or weight.
  • Sorry, but we do not ship outside of the Continental U.S.


Most orders will be ready within one business day. Please keep in mind that some items may require additional processing time to transfer from off-site locations. Other items may require additional processing time for assembly. We will call or email you once your order is ready for pickup. If you need an item right away we ask that you call us to confirm that the product is available before heading over to our store. Unless special arrangements are made in advance, orders need to be picked up within 15 days or a 10% restocking fee will be charged.


We protect the security of your information during transmission by using Secure Sockets Layer (SSL) software, which encrypts all of the information you provide to us and prevents outside parties from being able to "see" your transaction information. When your account information is displayed on your screen, we only display the last five digits of your credit card numbers. You also have the choice of whether or not to save credit card information with us in your Online Account.


Occasionally, some items are unexpectedly out of stock or unavailable and may be backordered. If this should occur, we will only bill your credit card for merchandise that is actually shipped. The total shipping charge for orders split into multiple shipments will not exceed the amount quoted on original order.


Payment in full is required before special orders will be placed. Returns on special order items will be subject to a 20% restocking fee.


Warranty claims will be addressed in a manner consistent with the manufacturer's guidelines and only on items purchased at Pete's Garage. In instances where the manufacturer does not cover labor, charges will apply to execute warranty repairs.


This website is intended to help you. We make every effort to maintain current, accurate prices in our on-line catalog. And we strive for similar accuracy and timeliness with the other information we offer here. We appreciate your understanding should any of the prices or other information provided be incorrect and regret any inconvenience such mistakes may create. All prices are subject to change at any time, and unfortunately we cannot honor any previous pricing once a change is made. Please bring any errors you may find to our attention on your next visit or by calling or sending us an e-mail.

Borealis Keystone eFat Bike 2023 Gray / Blue 27.5 Mule




The Keystone is the first E-Fat bike offered by Borealis, and it's a do-anthing, go-anywhere beast.
  • Frame geometry provides responsive handling, offering maximum control for varying conditions in snow or sand.
  • Tire clearance up to 26x5” and 27.5x4.5”.
  • Lightweight, 6000 series aluminum frame comes with internally routed cables, 1-2 bottle cage mounts and lizard skin protection.
    • Color: Gunmetal Grey with Cobalt Blue Graphics
    • Weight: 56 shown.
  • Standard features include:
      Shimano EP8 Drive Unit
      Shimano 630Wh Battery
      SRAM G2 RS brakes
      Mastodon Pro EXT 120mm suspension fork
      Carbon handlebars
      Dropper seat post
      Durable Sun Ringle Mulefüt Rims
Technical Information
FrameBorealis Keystone Aluminum 15", 17", 19", 21"
Drive UnitShimano DU-EP800
BatteryShimano BT-E8036 (630Wh)
DisplayShimano SC-EM800
Assist SwitchShimano SW-EM800L
Speed SensorShimanoEWSS300L540A
ForkManitou Mastodon PRO EXT 120mm, 51mm offset
HeadsetFSA w/ Star Nut
StemBorealis 50mm or 70mm (Based on Supply)
HandlebarBorealis Carbon
GripsErgon GP1
SaddleWTB Volt Medium Steel
Seat CollarBorealis Bolt-On
SeatpostKS Lev Integra 125mm (SM, MD) / 150mm (LG, XL)
BrakesSRAM G2 RS
RotorsSRAM HS2 200mm front / 180mm rear
ShifterSRAM AXS Pod Contoller Right Bridge w/ MMX Clamp for GX Eagle Transmission
DerailleurSRAM GX Eagle Transmission Derailleur
CassetteSRAM GX Eagle Transmission Cassette 10-52T
ChainSRAM GX Eagle Transmission Flattop Chain
Crank ArmsSamox 170mm
Chainring MountSamox 104 BCD for 75mm chainline
ChainringSRAM Eagle Transmission E-Bike MTB Chainring 104 BCD 36T Steel
RimsYour choice of SunRingle Mulefüt SL - 26x80, 27.5x80, or 27.5x65
SpokesStraight Gauge 2.0 Black
HubsBorealis Gen 4 15x150 / 12x197
TiresYour choice. All tire options are listed online.
IncludedShimano ECE80042 Battery Charger, AXS Power Pack, Kickstand, UDH Hanger, Key for battery release, Borealis Rear Thru Axle, Remote Battery Charging Adapter
WeightSize Medium w/ Mulefut 27.5x80 & Terrene Yippee Ki Yay 4.3" Tires: 56 lbs.
Sizing Information
Professional Opinion
Product Reviews
Write a review
0 As rated by 0 customers

Write a review for Borealis Keystone eFat Bike 2023 Gray / Blue 27.5 Mule

Your name
Your email address
How would you rate it?
Would you recommend this product?
Let others know your opinion
Submit Review Close
Question(s) answered about Borealis Keystone eFat Bike 2023 Gray / Blue 27.5 Mule
Ask a question
Question(s) asked regarding Borealis Keystone eFat Bike 2023 Gray / Blue 27.5 Mule

Ask a question

Your name
Your email address
Your phone number
Your question
Submit Question  Close
Home Mountain Biking Bikes Borealis Electric Bikes