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Description
e fat mountainbike 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
4.1 ★★★★★
Based on 2111 reviews
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Product Reviews
★★★★★ 5
Not Squeakable for Mini/Toy Aussies
Size: Medium (VALUE 2-Pack), Style: Chicken
Very durable and good squeaker. However, too large and hard for my Mini Aussies to squeak. My Aussies love their squeaky toys, unfortunately not this one.
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Reviewed in the United States on May 1, 2026
★★★★★ 4
Not indestructable, but very sturdy
Size: Medium, Style: Beef
I have recently been blessed (and cursed) with my first Super Chewer dog, a year old Australian Shepherd. She will chew herself out of boredom, so it's imperative we always have sturdy toys readily available for her, preferably in every room.
Playology and Kong by and large have been the best toys we can find for her. Kong has a very good rubber ball, bone, and ring that have held up spectacularly (no noticeable damage after months of use, except maybe some pin-prick teeth marks). Dogs need a wide range of textures though for enrichment, so we've been dabbling with the Playology line (the tire, plush bone, dry-tech rope), including this ball.
The scent factor is definitely interesting. Most people know Playology for the peanut butter scents, so I was very excited to find a multitude of flavors available on Amazon, especially with the different scents clearly labeled. I choose the red or beef flavored since the only two in the medium size in stock at the time were beef and sweet potato. The scent is indeed noticeable to humans, but it's not too strong or overwhelming on its own (walking down the Playology aisle in Petsmart can be overwhelming though since they have dozens of dozens of scented toys, much like going down a candle aisle).
I can't speak for the dog on how she feels about the scent, but she took to the ball immediately, same as the normal peanut butter ones we get. The medium size is pretty much perfect for her (she's just under 50lbs). It's got decent bounce for playing fetch in the house, but not so bouncy that we're afraid to use it in the house. It's got a decent density to it as well that adds to the sturdiness.
The biggest issue is the squeaker. It's not an obnoxious squeaker by any means, and the dog enjoys it very much. However, when you put a squeaker in any toy, it reduces the density and creates a weak spot dogs can exploit. She did good with the ball at first and was able to sit and chew on it for minutes as a time without doing any real damage (her teeth leave lots of pin-prick teeth marks, but they don't do any real damage to the ball, just superficial marks).
Aussies are considered incredibly smart though, and it didn't take her long to learn she could rip out the bottom of the ball where the squeaker is sealed inside to tear the squeaker out, thus ripping the squeaker apart and compromising the structural integrity of the ball. We're debating if we want to toss the ball in the trash or attempt letting her play with it in a supervised session without the squeaker to see if it is safe.
So, overall, this is a very tough ball. It does accumulate teeth marks that are essentially harmless, but there is a weak spot in the seam where the squeaker is inserted, which means this is not indestructible. It is by and large a great ball for fetch and likely won't ever be destroyed unless a dog is left with it long enough to chew a hole through that squeaker seam. Playology balls are pretty costly though, so the risk of it becoming unusable once the squeaker is ripped out is a bit off-putting. The bright side is that if you monitor your dog, you can likely get several weeks or months of use out of the ball; just no unsupervised play sessions.
7/10, durable, bouncy, and the scent keeps the dog interested, but the ball is not good unsupervised as it can be destroyed if the squeaker is ripped out. We will continue to buy Playology toys, but we will likely not buy too many of these balls until a more durable one (maybe without a squeaker) is released.
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Reviewed in the United States on March 20, 2022
★★★★★ 1
No. Just no. My own dog shamed me…
Size: Medium, Style: Beef, Size: Medium, Style: Beef
My German Shepherd likes squeaky balls. She has lots of them. Most are similar to a tennis ball. By the way, don’t give your dog an actual tennis ball. The outer material is made for grip for tennis. It’s abrasive and is not good for your dog’s teeth enamel at all.
Anyway, for $14.99, I thought I’d give this one a try. The pictured packaging alone was an eye grabber. The picture you see on Amazon is a cardboard with item specific info on the card: flavor, size, what it is (squeaky ball). The pictured product also has a hole in the card to secure and present the item the card describes. Even two color coded red zip ties securing the ball in the card hole. Awesome presentation and frankly that’s what made me give this a shot. So, as far as the presented product/packaging on Amazon, great job! I even sent a link to a buddy and he bought one too.
Well, I cannot speak for everyone, but what I received was what’s pictured with my review. A red ball in a clear bag, along with a card that describes the product line. Nothing specific to what I actually bought (like the slick item-specific packaging on Amazon. To find that, I had to read the condensed description on the Amazon specific bar code that is right on top of a different barcode. This kind of thing displeases me. I want what grabbed my attention on amazon. No, this was not a return. This is how they come.
I figured with item specific info on the packaging, the company is putting some money into packaging that makes you feel like you bought something specific. Pictured one says all natural beef. The chicken one says chicken. Pictured one says the size. Heck, I’d of been happy to at least have the ball attached to a card that at least says it’s a squeaky ball. Nope.
Cost cutting is not ok when you are selling a beef flavored, medium size squeaky ball for $14.99.
What arrives is an advertisement for the whole line, nothing that says what it is, the flavor, the size (unless you try to make out the Amazon bar code desc). Just a ball in a bag with an advertisement to buy other stuff they make.
Maybe you received what’s pictured. I texted my buddy and asked him what he received. The exact same thing I did.
In my opinion, when one cuts corners on packaging, I have no doubt corners could have been cut with the product itself. The squeak isn’t as easy as kong ball squeaker. Takes effort. So if your dog likes to play by walking/running around while constantly biting and getting that pleasing squeak each time, that didn’t happen here. Yes, I know the tennis ball type squeakers are different. But this says it’s a squeaker ball. Not just a squeaker ball, but a flavored squeaker ball. Mine smelled like rubber. Where’s the beef?
I threw it a few times. My dog chased it a bit, did her usual “what’s this” evaluation, bit into it a few times with her very strong jaws, only to have no squeak. God as my witness, she dropped it, looked at me with what I insist is a look of disappointment, and walked away. She then went to the big bin of a huge variety of squeaky balls and grabbed one. She then went upstairs, with a squeak every second or so as she went up.
I went and picked this one up with slobber and all. To get this to squeak requires opposing thumbs. So I suppose it could be marketed as a hand strengthener that squeaks.
Friends lab had zero interest as well. So, I’m gong to actually return a dog toy. This was a disappointment. If it had come carded the way it shows on Amazon, I would not be as frustrated. I won’t take a chance when corners are cut when it comes to my dog. Update the picture to what I received is my advice to the company. I have a feeling what I got wouldn’t sell as easily.
Topping it off, I noticed something odd. It doesn’t squeak when squeezing it, only when it is released to go back to its regular shape. So it’s a reverse reward. Weird. All the squeaker balls we have make a noise both when squeezing and releasing.
Sorry Olina (my pooch).
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Reviewed in the United States on April 25, 2023
★★★★★ 5
Best Toy EVER!
Size: Jumbo, Style: Peanut Butter
I was a bit skeptical. We have had NO joy in finding toys for "aggressive" chewers that actually last more than a day for our 1 year old Staffordshire/Pittie mix. He has jaws of iron! (or so it seems) Nothing holds up. He is literally eating them, and subsequently gets them taken away, within 24 to 48 h ours. IF that long. He finds it a challenge to get to the center of whatever toy he has, whether it is supposed to have a center or not! We bought this in April of last year!! Yes, the squeaker is no longer squeaking (a blessing in disguise) but the ball itself is still intact, with no nicks, dings, pieces missing, etc. It still bounces well, and he still loves it. 1 year later, still going strong! I didn't realize it had been that long, until today. So I had to write a review, and buy a couple more Playology Jumbo toys. I hope they hold up 1 tenth as well!
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Reviewed in the United States on December 20, 2025
★★★★★ 3
Hit or miss
Size: Medium, Style: Beef, Size: Medium, Style: Beef
I’ve purchased this item multiple times. Twice now, I got duds. Within minutes of opening the package, the ball was destroyed. The other times, it lasted months! I don’t know how to explain it.
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Reviewed in the United States on April 22, 2026
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