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Description
e bike fatbike fully ELECTRIC FAT TIRE E-BIKEIntroducing 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
4.6 ★★★★★
Based on 6 reviews
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Product Reviews
★★★★★ 5
A Must for contemporary military and civilian leaders in national security
Format: Kindle
This is a very very useful work for members of the contemporary national security strategy community. While Hew's reputation as a historian is very high, it is his thoughtful and insightful comments that he makes in the latter chapters that lay out some of the critical challenges facing contemporary military and civilian leaders.
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Reviewed in the United States on August 19, 2016
★★★★★ 5
Astoundingly Good
Format: Kindle
This is a must have book. It is, beyond a doubt, the best book I have read on military strategy. The author is clear, provides case examples, and more importantly makes this "readable."
I retired with 24 years on active duty and spent 15 more working in PMC's working in austere and conflict environments. THIS book is long overdue.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 6, 2014
★★★★★ 5
Thoughtful and deeply insightful
Format: Kindle
Browse not only goes over the current state of the US military in detail, but also ends with concrete and manageable suggestions to fix the major problems. Really good book.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 19, 2025
★★★★★ 5
Eye Opening, Thought Provoking and Scary
Format: Hardcover
This book will grab your attention, keep you spell bound and scare the heck out of you. The author was the Chief of Staff under Senator McCain for the Senate Armed Services Committee. This book is about new technology in the defense field and our inability to deal with it.
The new technology comes in many forms. There now are missiles that fly 2 or 3 times faster than what is available now. The missiles can reach out many many thousands of miles more, enough to hit America from the other side of the world. Now computers are recently coming out on the market which are smaller and 2 or 3 times faster than previous computers. All of that combines to radically speed up the decision time for war operations. The author calls it the kill chain.
The change doesn't stop there. The tactics used by our competitors has radically changed warfare. The examples the author uses comes from Russia. He reviews their invasion of "Little Green Men" in the Ukraine turned warfare upside down. They infiltrated troops into the land. Then they merged with dissent forces already in the country. Then the war stars, but on a small scale. Before you know it Russia grabbed Crimea and neutralized a huge slice of the Ukraine. That was the first time since WWII where borders changed.
The last part of the book is the most scary. He relies on his experience in Congress. He cites several examples to show where the bureaucracy is incapable of change. The pressures of on going operations, turf wars, political desires to protect home based companies all have immobilized the bureaucracy. He also cites the case of the Army trying to get a new side arm. It took 17 million to test an off the shelf pistol. The case showed how fear of risk has layered on level after level of control and check. Those levels of course adds costs. That was just one weapons program. Can you imagine what the cost is as you expand that out to really big ticket things like carriers. It leads to the Pentagon to continue buying weapons it doesn't need and use tactics which really come out of WWII. As the Pentagon games go on the world's armies change. I think his point about the bureaucracy caught in a never ending loop also might explain other troubles across the globe.
That leads to the scary part. Is the country ready for the future? Will it defend the nation for the future? If it isn't 9/11 might be a match strike in comparison.
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Reviewed in the United States on June 11, 2020
★★★★★ 4
Eyes Wide Open (with a few omissions)
Format: Audiobook
Thought provoking and great insights but with a few material omissions.
As others have noted this is an extremely thought provoking book. Perhaps the most disturbing is the discussion of war gaming a war with China and in most every Chinese initiated war China wins. A close runner-up was the lack of widespread commitment of other senate members to be as fully informed as possible on the military side of military affairs including budgets for specific projects.
It's hard to document the claim that two issues were serious omissions but I think there were.
There are seemingly minor details that are important Robert McNamara worked for Ford not GM. This is important for decisions at Ford by McNamara's accolates took Ford down to one of its smallest market share of the postwar years. McNamara gave Ford the Falcon , his successors brought out the Mustang. His arrogance cost billions and thousands of lives.
McCain recognized the political folly of the initial "leased" Boeing Replacement Tanker Program but that is not discussed. Neither is the continuing debacle of the program, felony convictions/pleas of top Boeing execs and the Pentagon's civilian chief of procurement all associated with the ill-fated tanker program. Declared a near emergency need at the turn of the century, twenty later the tankers can not perform the mission and tens of billions over budget.
To put the Tanker Program debacle in perspective, In July 1962 the US achieved its first orbital space flight and its first Moon landing 7 years later. In contrast the replacement tanker program has been in process Boeing was awarded the contract in 2002 , 19 years later and the tankers are not fully operational. Along the way both Boeing and a top civilian dod official did some hard time on felony corruption convictions/pleas.
The author notes that in the event of an outbreak of war between the US and China the US ships must get far offshore to have even a chance of survival, well beyond the range of existing carrier based aircraft to attack Chinese forces. The lack of tankers, short range attack aircraft and light loads prevents the Navy from going deep inland.
Part of the problem is that the Navy was induced to scrap the long range, extremely deadly F-14B and F-14X and replace them with the slower, shorter range , less carrying capacity F-18s (also made by Boeing) . The Navy had available at the time the F-14X upgrade program which would have converted the F-14 to an even more deadly fighter / bomber and equipped them with a follow-on to the Phoenix missiles, so badly needed to defend the fleet against airborne launched cruise missiles. In addition there were further upgrades in the works to give the Phoenix missiles extremely valuable capabilities. A further indication of the suspicious pattern is that DOD required that all F-14 tooling and parts be destroyed. The claim was made that the F-14s were maintenance hogs. Partly true but largely fixed with the F-14X digital conversion and new engines. While the maintenance hours per flight hour were problematical, when looked at in the big picture they were a rounding error in the 6,000 or so sailors in the Battle Group working 10-15 hour days and the thousands onshore supporting the effort.
Does this matter, well yesterday the Chinese ran a practice attack on a US carrier as about 15 aircraft approached within 250 nautical miles of the carrier. Most certainly within range to launch enough hypersonic cruise missiles to virtually assure the carrier would be taken out of action or sent to the bottom of the ocean. As the author notes today's strategy requires that the carriers flee the area and standoff about 1,000 miles. Faster, much longer range F-14x aircraft with the next generation Phoenix would significantly reduce this threat. They would also do the same against large Russian aircraft carrying many cruise missiles.
The F-35s will help overcome this deficiency but until they are fully operational and our Naval tanker capabilities redeveloped US capabilities are seriously compromised.
The author makes many great observations regarding deficiencies in procurement management, in the Pentagon , Congress and White House.
Examples discussed include the Army's failed attempt to acquire a new pistol. The 500 page request for proposals and flawed competition would be a joke were in not for the fact that the taxpayers precious dollars were wasted in the failed effort.
An illustration of how perverted the situation has become was illustrated today with a note the the US Air Force had issued an RFP for a "modesty curtain" to be installed on our ancient B-52's because there were now female personnel flying missions. This is a need that should be solvable by a few individuals over a bottle of wine who would probably come up with better ideas, reviewed by an engineer on Monday and perhaps fabricated in one of the base shops.
As others have noted it was USAF Col John Boyd who revolutionized the air to air combat, was shunned by top Brass while at the Pentagon and left to his own devices prepared his famous day long lecture on Winning and Loosing Wars that in turn helped rewrite the USMC land battle doctrine. Most all of this work done out of sight of his "leaders" .
The author might have also given credit to leaders like Admiral Tom Connolly who sacrificed his career to save Naval aviation from the terminally flawed F-111B as an example of the character and courage needed in the Pentagon, Congress and the White House today and into the future.
The author's descriptions of the challenges posed by an aggressive and expansive China should be taken to heart by every American. Unless we stop treating military procurement as a Chicago like spoils system and manage both what we buy and what we pay for it we are inviting Chinese military challenges and placing an even greater financial millstone around the necks of American taxpayers and their future generations.
Overall , not perfect but a very important must read
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Reviewed in the United States on January 30, 2021
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