Pay in installments of $6.19 with
,
and
Shipping Estimate
USA
- USA
- CAN
- USA
- CAN
Ships within 48 hours · Estimated delivery Oct 17 - Oct 22
Promo Codes Available:
For Your Every Summer RSVP, with Code: SUMMER15
Description
fully fatbike e bike KeystoneIntroducing the all new Keystone Electric Fat Tire Bike. Since 2013, Borealis has specialized in lightweight, high end fat bikes. The Keystone is our first ever Class I electric bike. The frame geometry is optimized for riding just about anything with clearance for up to 5 wide tires. Paired with the most technically advanced components in the industry, the Keystone sets the standard for premium quality Electric fat bikes. HIGHLIGHTS Color: Gunmetal
Introducing the all-new Keystone Electric Fat Tire Bike. Since 2013, Borealis has specialized in lightweight, high end fat bikes. The Keystone is our first ever Class I electric bike. The frame geometry is optimized for riding just about anything with clearance for up to 5” wide tires. Paired with the most technically advanced components in the industry, the Keystone sets the standard for premium quality Electric fat bikes.
HIGHLIGHTS
- Color: Gunmetal Grey with Cobalt Blue Graphics
- Weight: 56 lbs. as 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 and your choice of tires.
- 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.
- Keystone Frames are backed by our LIMITED LIFETIME WARRANTY.
ASSEMBLY
Some assembly required upon receipt. Your bike will be completely assembled and tuned by Borealis, then partially disassembled for shipment. The remaining assembly will require installation of the rear derailleur, chain, fork, seat post, wheels, and handlebars. A kit will be included with your order that has all the necessary tools assemble your bike, including a multi-tool, torque wrench, and shock pump. If you are not familiar with this level of assembly, we recommend having your local bike shop complete the assembly.
Stay tuned for our step-by-step assembly video.
WHEELS AND TIRES
- All bikes come standard with tubes.
- If you order rim tape with your Mulefut rims, we will tape the rims and install the tires with tubes.
- Tubes must be removed and tubeless valves installed for tubeless set up. We recommended to have this completed by a professional bicycle mechanic.
SIZE CHART
BUILD SPECS
| Frame | Borealis Keystone Aluminum 15", 17", 19", 21" |
| Drive Unit | Shimano DU-EP800 |
| Battery | Shimano BT-E8036 (630Wh) |
| Display | Shimano SC-EM800 |
| Assist Switch | Shimano SW-EM800L |
| Speed Sensor | Shimano EWSS300L540A |
| Fork | Manitou Mastodon PRO EXT 120mm, 51mm offset |
| Headset | FSA w/ Star Nut |
| Stem | Borealis 50mm |
| Handlebar | Borealis Carbon |
| Grips | Ergon GP1 |
| Saddle | WTB Volt Medium Steel |
| Seat Collar | Borealis Bolt-On |
| Seatpost | KS Lev Integra 125mm (SM, MD) / 150mm (LG, XL) |
| Brakes | SRAM G2 RS |
| Rotors | SRAM HS2 200mm front / 180mm rear |
| Shifter | SRAM AXS Pod Contoller Right Bridge w/ MMX Clamp for GX Eagle Transmission |
| Derailleur | SRAM GX Eagle Transmission Derailleur |
| Cassette | SRAM GX Eagle Transmission Cassette 10-52T |
| Chain | SRAM GX Eagle Transmission Flattop Chain |
| Crank Arms | Samox 170mm |
| Chainring Mount | Samox 104 BCD for 75mm chainline |
| Chainring | SRAM Eagle Transmission E-Bike MTB Chainring 104 BCD 36T Steel |
| Rims | Your choice of SunRingle Mulefüt SL - 26x80, 27.5x80, or 27.5x65 |
| Spokes | Straight Gauge 2.0 Black |
| Hubs | Borealis Gen 4 15x150 / 12x197 |
| Tires | Your choice. All tire options are listed online. |
| Included | Shimano ECE80042 Battery Charger, AXS Power Pack, Kickstand, UDH Hanger, Key for battery release, Borealis Rear Thru Axle, Remote Battery Charging Adapter |
| Weight | Size Medium w/ Mulefut 27.5x80 & Terrene Yippee Ki Yay 4.3" Tires: 56 lbs. |
FRAME SPECS
| Wheel / Tire Size | 26 x 3.8–5.0" on up to a 100mm rim / 27.5 x 2.8-4.5 on up to a 82mm rim / 29 x 2.25–3.0 |
| Susp Fork Travel | 120mm |
| Fork Offset | 51mm |
| Headset-Upper | IS41 |
| Headset-Lower | IS52 |
| Seatpost | ø31.6mm |
| Seat Collar | ø34.9mm |
| Dropper Compatible | Internal - 125mm for SM & MD / 150mm for LG & XL |
| Front Derailleur Type | Not Compatible |
| Bottom Bracket | Shimano EP8 |
| Crankset (Max Ring) | Chainline 75mm / 1x (38t) |
| Rear Brake (Rotor) | 74mm post (160–180mm) |
| Rear Spacing | 197 x 12mm thru-axle |
| Rear Axle | ø12 x 222L, TP= 1.0, TL = 16 |
| Derailleur Hanger | SRAM UDH |
| Bottle Mount | Small & Medium: 1 (downtube) / Large & XL: 2 (downtube & seatube) |
| Rear Rack Reccomendation | Old Man Mountain Divide Fat |
| Rear Rack Mounts, Upper | Yes |
| Axle to Crown | 531mm |
| Steerer Tube Size | 28.6mm |
| Steerer Style | Tapered |
| Crown Seat Diameter | 40mm |
GEOMETRY CHART
| Small 15" | Medium 17" | Large 19" | X-Large 21" | |
| Effective Top Tube | 630 | 645 | 660 | 665 |
| Seat Tube Center to Top | 381 | 432 | 482 | 533 |
| Head Tube Length | 160 | 160 | 175 | 190 |
| Head Tube Angle | 69° | 69° | 69° | 69° |
| Seat Tube Angle | 73° | 73° | 73° | 73° |
| Chainstay Length | 480 | 480 | 480 | 480 |
| BB Drop | 60 | 60 | 60 | 60 |
| Reach | 420 | 435 | 445 | 446 |
| Stack | 688 | 688 | 702 | 716 |
| Standover Height | varies based on wheel and tire size | |||
| Wheelbase | 1187 | 1207 | 1223 | 1229 |
| Fork Offset | 51 | 51 | 51 | 51 |
FAQ:
| Can I use the Keystone in cold temperatures? | It is okay to use your Keystone in the operating temperature range, suggest by Shimano: -10 - 50°C |
| How do I remove the battery? | Each Keystone will come with a set of keys. Make sure to save your spare key and safe location. Insert the key fully into the lock cylinder on the non drive side of the downtube until it stops. Rotate the key clockwise until the battery drops from the downtube providing access to the latch release mechanism. Use your index finger to gently depress the spring which will fully release the battery. Use caution to support the battery when removing it so it does not fall to the ground. |
| How can I file a warranty claim for the drive unit and other electronic components? | Contact an authorized Shimano STEPS dealer. |
| Can I change my motor/power settings? | Yes, you can customize your motor settings via the app as well as update the firmware. You'll need to download the Shimano E-tube mobile app. |
| Can I change the max speed? | No. Depending on where you've purchased your Keystone it will either have a max assist speed of 20mph or 25km/h. This setting cannot be modified by the user or a dealer. |
| Can I purchase an extra battery? | Yes, you can purchase a spare battery kit with a spare downtube cover directly from Borealis. Spare battery kits may not be available in all markets. You can also purchase a spare battery from Shimano, but it will not include a battery cover. |
| Can I ride the Keystone without the battery? | No. This will void your warranty with Shimano and cause damage to the motor system. |
| Do I need to update the firmware / software? | Firmware can be updated via the Shimano E-tube mobile app. |
| How do I use walk mode? | Hold the upper button (down assistance level) for 1 second until the display turns blue and displays WALK mode. Press and hold the same button to power the rear wheel. |
| How long does it take to charge the Shimano 630Wh Battery? | With the included EC-E8004 charger, the battery can fully charge in 6 hours. |
| How long will my battery last? | The remaining battery capacity is affected by temperature and cycle count. Generally, it decreases approximately 5% a year. This means roughly 95% capacity remains after 1 year, and 90% after 2 years. |
| How should I store my bike and or battery? | Charge your battery to approximately 70% before storing for long periods of time. Store in a cool, indoor location with a stable temperature between approximately 10 - 20 C / 50 - 70 F. No direct exposure to sunlight or rain. |
| Are the electronic components waterproof? | Yes, the STEPS system is waterproof as long as all components of the system, including the battery and battery cover, are installed correctly. We recommend not using a high-pressure washer to clean your Repeater, but riding in the rain and regular cleaning are okay. |
| My bike won't turn on, what do I do? | First, make sure all cables are plugged in, if they are then try removing and reinstalling the battery. If it still won't turn on try charging your bike for a few hours. If your bike is too hot or too cold, it might not turn on. If your bike still does not turn on, contact a Transition or Shimano dealer for support. |
| Should I only charge my battery when it's completely drained? | No, simply charge the battery any time you need it, frequent charges actually help battery longevity. Avoid letting the battery discharge completely. Charge to 70% before storing for long periods. |
| What are the different error codes and what do they mean? | Whenever you encounter an error code, first cycle the power off and then back on. If the code persists, remove the battery and then reinstall, which will hard reset the system. If neither of these steps resolves the issue, please reference the Shimano error code list. If you cannot resolve your error code via your Etube mobile app please visit your nearest Shimano STEPS dealer or contact Shimano STEPS customer support. |
| What is the range and how can I maximize it? | There are many factors that affect battery range, such as, how much effort the rider is providing, the gradient of terrain, ambient temperature, and rider weight. The best way to maximize your range it to spend more time in Eco and Trail modes, and minimize the amount of time spent in Boost mode. |
| What is the widest tire the Keystone can fit? | 26x5.0" or 27.5x4.5" |
| What kind of maintenance is needed on the drive unit and how often? | The drive unit is sealed and cannot be serviced. If there are any issues with the drive unit, it will need to be removed and sent back to Shimano for service or replacement. The drive unit along with the battery is designed to last over 1000 charge cycles. Assuming you're getting 30 miles (48Km) per charge, the drive unit should last 30,000 miles, or much longer than pretty much any other part on your bike. |
| Why does my bike stop giving assistance over a certain speed? | Depending on where you've purchased your Keystone it will either have a max assist speed of 20mph or 25km/h. This setting cannot be modified by the user or a dealer. |
| Will environmental temperature affect battery life? | The battery life will be shorter during cold temperatures, this is not a sign of a problem. |
| Will my bike be delivered with a charged battery? | Your Keystone was shipped in a "sleep" mode with the battery at approximately 30% charge. It is recommended to fully charge your battery before the first ride. |
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.7 ★★★★★
Based on 10 reviews
Sort
Product Reviews
★★★★★ 1
JUNK, Cheaply built, Feed Scanner fails and falls apart in less than 5 months and only 4 uses.
Style: ET-4800, Color: White, Set: FAX/ADF/Print/Copy/Scan, Style: ET-4800, Color: White, Set: FAX/ADF/Print/Copy/Scan
Absolute piece of Junk!
Built cheaply.
Feed Scanner has never worked properly from my first scan (only did 4) and now falls apart completely, in the roller section. It falls out after it jammed for the 7th time today, this time with a SINGLE piece of paper.
If you have a piece of paper that has a fold in it, forget about it. That will never feed through.
I had 6 sheets I had to get out today, I had to do manually via the flat bed, both sides.
It took 23 minutes to get done. Should not have taken 2.
The last time I used it same issues but less sheets.
The paper is SO TIGHT in the feed section it is hitting BOTH walls.
You could not slip a piece of paper in there if you wanted too, most likely one of the reasons it does not feed correctly.
While on the phone with support (I am right now, 4th call today and 3 emails of pictures they wanted later, the hoops they put you through is ridiculous!)
Of course overseas support and has little to no knowledge of being Tech support, I asked for supervisors only to have my first call disconnect at 1 hour and 20 seconds.
Then the next call was 24 minutes, then another 32 minutes and now this one still ongoing (56 minutes and still going).
Now after 3 hours and 5 minutes, they are "holding" my credit card for 179.99 + tax to get a REFURB unit!
So much for a 5 year Warranty.
Oh they acted like it was out of date on Warranty, it has NOT been in EXISTENCE for 5 years , it came out in 2022.
Did I fail to mention you WILL be dealing with Overseas people who have you repeat the same thing over and over and over and over again. They wonder why I was getting upset...hmmmm .
As they pass you along the ranks you have to repeat EVERYTHING all over again.
As I was on the phone and they were asking me to open WRONG doors to find the serial #, I lifted once again the Jam area and guess what, the parts fell out.
Just PLOP!
Other issues while I am at it, the Picture quality is "OK" nothing special.
I bought it to save ink as HP gouges you to death and destroys your print head if you use a knockoff.
The Ink has been "OK", but I haven't really had it long enough to tell as most everything has been Black and White, so all are still full except the Black (3.4's).
Its a rear feed, I miss the HP draw on that, the print speed again is not fast, just OK. Though never really in a rush with it.
I cant say it enough, this is cheaply built, and my experience with Tech Support was a HORRIFIC.
I never like dealing with Over seas support as it is, but what they wanted pictures of as proof was mind blowing (pictures of the tubes that go to the ink wells? What does that have to do with the issue at hand.)
The panel function is anything but user friendly.
Firmware Updates, if not done, will prevent usage until done.
You have to download and install ALMOST 30 different files, from drivers to firmware updates the list is endless. Never have I had to do that many of ALL printers I have had combined.
Simple ZIP file and let it run on an executable file (EXE)like everyone else. That will take you over 2 hours to get all loaded.
The ink wasn't bad seeing it needs to be primed first to work, I am not sure what will happen when the REFURB comes, will I get ink or just have to re-prime from the cartridges.
The software for scanning is easy to use, though unnecessary, should just scan and auto save, or am I just spoiled by HP?
But to send me a "REFURB" as a replacement on a 5 month old unit with a 5 year warranty is really being low.
They did EVERYTHING they could to get me to NOT follow through in this return, you have ONLY 30 days on Amazon.
You have been warned, I would look elsewhere, the tank issue is a great Idea, but if it doesn't work, what good does it do.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 8, 2025
★★★★★ 5
First Impressions - Complete Review
Style: ET-4800, Color: White, Set: FAX/ADF/Print/Copy/Scan, Style: ET-4800, Color: White, Set: FAX/ADF/Print/Copy/Scan
Printer Review from an Artist.
Printer cost with a 3-year extended warranty - $199.00. Came with four full bottles of Ink. Each bottle was huge, and enough to completely fill up the tanks. In my old Epson printer that used Epson 127 Ink Cartridges a cartridge held 8ml of ink. The cost per cartridge for the XL Black was $31.00 on Amazon. In comparison, a bottle of ink for the tank printer costs $15.00 and holds 65ml. The Epson 127 Ink Cartridge is rated at 175 pages for the XL cartridge and the Tank Printer is rated at 4500 pages per bottle of ink. So, the difference in cost is striking.
Unboxing the printer was simple enough. The printer weighs about half the weight of my old Epson printer. The new printer does not have printer drawers but, back feed only. This actually worked out well for me since I was constantly taking the paper in out and out of the drawers when changing paper size. Also, with this direct paper feed, I figure it will handle my heavier weight card stock paper that I use for my art and greeting cards. To my great surprise, the printer offers two-sided printing. This is really handy when printing my Zines. The printer setup was extremely easy as they recommend a phone app, that walks you through each step with pictures. And it communicated perfectly with the phone for the setup. It takes about 15 minutes to completely set up the printer. I have learned to not rush setup. Take your time, and follow the instructions step by step, Which include filling the tanks.
Features,
* The printer dues Dual-Sided Print - Great for zines.
* It has fax capability, but we do not have a landline, so that will not be used.
* It does copying, with a document feeder or you can lift the feeder and place the document on the glass.
* I mostly use my Epson Precision San copier but it is nice if you wish to make a quick copy of a document.
* Some reviews complained about the very small LED display but I find that by using the app or computer I can control all that I need to do.
Print Alignment. I did this test but the printer heads did not require any alignment.
During the setup process, the program installs the printer driver on my computer. However I found it to be the very basic driver, and I went to the Epson Website and downloaded and installed the latest driver which is very robust and has all the settings that I needed.
The printer's footprint is smaller than my old printer. And my old printer had two paper drawers, though I never used the second drawer.
Negatives.
The output tray is flimsy and seems like it would easily break if bumped when I walked past the printer, so I have to be careful about this.
So far I do not see a way of checking the ink levels from the computer. And they said in the instructions to be sure to check your ink levels. You can see on the front of the printer, where you can see the ink levels. When you purchase more ink, you can attach the bottle and it will not overfill the tanks, and you can then use more ink from the bottle later. So I will purchase a complete set of ink and keep it and as it runs low with about 1/4 left in the tank, I will just fill it up.
So far I am very happy with the investment and now printing and ink cost is not a major factor. And I figure I will do a lot of printing with this printer when the holiday season rolls around for my greeting cards.
As for print quality, I will need to report on this later, though there were no negative reviews of print quality. A test print on regular paper and the colors seemed to be spot on.
One note, I still will continue to use my Canon Pro-300 Wide Printer for my Fine Art Prints, but the new Tank Printer will be my studio workhorse.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on August 11, 2024
★★★★★ 4
Frustrating to set up and unreliable
Style: ET-4800, Color: White, Set: FAX/ADF/Print/Copy/Scan
I bought the Epson EcoTank ET-4800 hoping for an easy, low-cost printing solution, but it has been nothing but trouble. The wireless setup is overly complicated, and the printer often loses connection to the network, forcing me to restart it or reinstall the software. Printing is slow, even for simple documents, and the paper feeder sometimes pulls multiple sheets at once. While the EcoTank system is supposed to save money on ink, the print quality is inconsistent — colors can be dull, and black text occasionally appears streaky. Scanning and copying are also sluggish. For the price, I expected something much more reliable.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on August 9, 2025
★★★★★ 5
ET-4800 EZ PZ set up and start up. Prints and scans just fine
Style: ET-4800, Color: White, Set: FAX/ADF/Print/Copy/Scan, Style: ET-4800, Color: White, Set: FAX/ADF/Print/Copy/Scan
An excellent home printer. And why did I purchase such?
I had an Epson WF-520 for nearly ten years. But neglect and lack of use caused the printer head to get gunked up. I cleaned the print heads using a solution of 95% Etoh and glass cleaner (about fifty/fifty), a syringe with a plastic tube attached and LOTS of paper towel strips. It was moderately successful but I was never able to get it back to like new printing.
I looked over several new printers and wanted to stay with Epson because of ease of use (copy, scanning, printing). Seems as tank printers are the way to go these days. So I ordered the ET-4800. Got here in only a couple of days. Setup was pretty easy, just follow the instructions either via the documentation included or online version. I have pinted and scanned a color test page. I used the built in SmartScan feature without having to think about it much. I am quite satisfied with the results.
By the way, there is no automatic two side printing. You actually have to get off your b---, take out the first printing, turn it over and refeed the stack. I was used to doing that with the old WF-520 and never had a problem.
I will now set up a once a week, automatic scheduled printing task. I will just have to make sure there is paper on hand. Lack of use is the killer of these inkjet machines regardless of manufacturer.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 16, 2026
★★★★★ 5
The intensity of the higher DPI and other settings makes this a marvelous Printer.
Style: ET-4800, Color: White, Set: FAX/ADF/Print/Copy/Scan
I am a former Canon product user for years. I became disappointed two printers ago. Support is horrible.
So, I ordered this Epson. Initially, because of the differences I was somewhat confused on the set-up; however, once completed, I can completely endorse this product. The printing is absolutely tops. The ink system is fantastic. AND, it has fax capabilities which I tested and works great. Can not say enough good things about it. I specialize in historical photo and documentation restoration - and this printer works GREAT.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 29, 2026