BULLS Monster E FS Review

Bulls Monster E Fs Electric Bike Review
Bulls Monster E Fs
Bulls Monster E Fs Bosch Performance Line Cx Chain Tensioner
Bulls Monster E Fs Bosch Powerpack 500 Battery
Bulls Monster E Fs Removable Bosch Intuvia Display Panel
Bulls Monster E Fs Rockshox Monarch Rt Rear Suspension
Bulls Monster E Fs Rock Shox Bluto Rl Solo Air
Bulls Monster E Fs Magura Mt Hydraulic Disc Brakes
Bulls Monster E Fs Shimano Deore Xt 11 Speed Drivetrain
Bulls Monster E Fs Electric Bike Review
Bulls Monster E Fs
Bulls Monster E Fs Bosch Performance Line Cx Chain Tensioner
Bulls Monster E Fs Bosch Powerpack 500 Battery
Bulls Monster E Fs Removable Bosch Intuvia Display Panel
Bulls Monster E Fs Rockshox Monarch Rt Rear Suspension
Bulls Monster E Fs Rock Shox Bluto Rl Solo Air
Bulls Monster E Fs Magura Mt Hydraulic Disc Brakes
Bulls Monster E Fs Shimano Deore Xt 11 Speed Drivetrain


  • Full suspension fat bike with a high quality mid-drive motor from Bosch and their updated 500 watt hour battery pack for extended range
  • Cool fluorescent paint job that extends all the way through the fork, rear shock housing, swing arm and battery pack, I think the battery blends in nicely and appreciate the metal base cup
  • Premium hardware here including tubeless-ready Schwalbe Jumbo Jim tires that can be ridden at lower pressure, light weight punched out rims and RockShox air fork
  • Eleven speed Shimano Deore XT drivetrain with chain tensioner, shift sensing software in the motor controller, Magura hydraulic disc brakes and thru-axles for improved stiffness

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Video Review

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Monster E FS



Body Position:


Suggested Use:

Trail, Sand and Snow

Electric Bike Class:

Pedal Assist (Class 1)
Learn more about Ebike classes


2 Years Motor and Battery, 5 Years Frame


Europe, Canada, United States, Australia, New Zealand

Model Year:


Bicycle Details

Total Weight:

55.6 lbs (25.21 kg)

Battery Weight:

5.7 lbs (2.58 kg)

Motor Weight:

8.8 lbs (3.99 kg)

Frame Material:

7005 Aluminium

Frame Sizes:

18.11 in (45.99 cm)20.07 in (50.97 cm)

Geometry Measurements:

31" Stand Over Height, 76" Length

Frame Types:


Frame Colors:

Neon Yellow with Matte Black Accents

Frame Fork Details:

Rock Shox Bluto RL Solo Air, 100 mm Remote Lockout, 15 mm E-Thru Axle

Frame Rear Details:

RockShox Monarch RT High Volume with 120 mm Travel, Rebound Adjust, 12 mm Quick Release Thru-Axle

Gearing Details:

11 Speed 1x11 Shimano Deore XT, 11-40

Shifter Details:

Shimano XT Triggers on Right


FSA CK-760/IS Cranks, 15T Chainring


Wellgo Alloy Platform, Cage STyle


Tapered 1 1/8"


7° Rise (80 mm, 90 mm)


Low Rise, 720 mm, 25 mm Rise, 9° Bend

Brake Details:

Magura Hydraulic Disc with 180 mm Rotors, MT-5 Four Piston Front MT-4 Two Piston Back Calipers, Magura MT Levers


Ergon GA30 Locking Grips, Flat, Black


Selle Royale Seta M1

Seat Post:


Seat Post Length:

350 mm

Seat Post Diameter:

30.9 mm


Alloy, Punched Out Square Holes, 32 Hole, 80 mm Width


Stainless Steel, 13 Gauge, Black

Tire Brand:

Schwalbe Jumbo Jime, 26" x 4"

Wheel Sizes:

26 in (66.04cm)

Tire Details:

Pace Star 3, Tubeless Easy Snakeskin

Tube Details:

Presta Valve


Sticker Slap Guard, Chain Tensioner with Narrow Wide Teeth


Aluminum Skid Plate, Locking Removable Battery Pack

Electronic Details

Motor Brand:

Bosch Performance Line CX, Gen 2

Motor Type:

Mid-Mounted Geared Motor
Learn more about Ebike motors

Motor Nominal Output:

350 watts

Motor Torque:

75 Newton meters

Battery Brand:


Battery Voltage:

36 volts

Battery Amp Hours:

13.4 ah

Battery Watt Hours:

482.4 wh

Battery Chemistry:


Charge Time:

4.5 hours

Estimated Min Range:

45 miles (72 km)

Estimated Max Range:

130 miles (209 km)

Display Type:

Intuvia, Removable, Adjustable Angle, Grayscale, Backlit LCD


Speed, Assist Level (Eco, Tour, Sport, Turbo), Battery Level (1-5), Odometer, Trip Distance, Estimated Range, Clock, Max Speed, Average Speed, Trip Time, Shift Assist Recommendation

Display Accessories:

Independent Button Pad with Tactile Feedback on Left, 6 Volt Micro USB Port on Display

Drive Mode:

Advanced Pedal Assist (Measures Wheel Speed, Pedal Cadence and Pedal Torque, Power Output Relative to Pedal Input: Eco 50%, Tour 120%, Sport 210%, Turbo 300%)

Top Speed:

20 mph (32 kph)

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Written Review

Fat tire electric bikes offer a perfect blend of technology and adventure in my opinion… an unpowered fat bike is fun, sure, but the added weight and drag of larger wheels and tires means that most people are limited in how far and long they can actually enjoy the ride. Furthermore, if you actually do seek out the snowy fields and sandy beaches that those fat tires yearn for (as I did in this video review), they can become uncomfortable because the terrain isn’t always smooth! And once you’ve added suspension there’s increased weight and often some bob as you pedal along. So that’s where this whole full suspension fat tire electric bicycle concept fits in… In many ways, it isn’t that surprising right? We see full suspension motocross bikes all the time, in fact I think most motorcycles (even road bikes) offer full suspension. But they’re loud, heavy and usually illegal on bike paths, mountain trails and beaches. The Monster E FS delivers something special in this domain, an ebike that’s both capable of handling a wide variety of terrain and usually well accepted there. It’s made with some of the best consumer/performance level hardware on the market as of this review (Magura brakes, Shimano Deore XT derailleur) and is driven by one of my favorite motor systems around, the Performance Line CX from Bosch.

With internally routed cabling, a sporty paint job and some additional metal shields in place, the battery pack truly blends in on this bike. And despite offering about 25% larger battery capacity than the previous Powerpack 400, the battery form factor is exactly the same and it weighs less than a half a pound more! You can still charge it on or off the bike and it’s even backwards compatible so if you already own a Bosch powered electric bike from the 2014-2016 timeframe you can swap them out or carry an extra along for increased range. Having tested and reviewed some of the other BULLS electric bike models recently, those with the more tightly integrated Brose battery/motor system, I gained renewed appreciation for how beautifully and simply the Bosch pack clicks in and locks. You don’t have to worry so much about bumping the key if you accidentally leave it in and you don’t have to physically twist the key to lock the pack… just when you unlock it, and this increases security. Going from there, the control panel and button pad that let you interact with the battery and motor are both very well done. You can switch assist levels on the fly without lifting your left hand and compromising your grip… just a bit of thumb work. And you can also cycle through display readouts this way. One of my favorite menus is range approximation because it dynamically updates depending on how you’re riding, what assist level you’ve selected and how much battery capacity remains in the pack. This is the sort of feedback that ensures you won’t get stuck way out in the backcountry with a depleted pack. This is especially relevant because the battery indicator only shows five bars vs. 10 on some other bike displays. That’s one of my minor gripes.

If you do get stranded on this ebike, no worries because it has a wide range of 11 gears for pedaling. And in the electric bicycle world, that’s quite a few! I found that the bike was operable on human power alone (especially on pavement) and enjoyed the rolling momentum that the tires offered once up to speed. It was easy to handle the bike on all terrain types we tested thanks to longer mountain bike style bars with locking Ergon grips and I appreciated the remote lockout on the Bluto suspension fork. Many of the hardware components chosen for this bike are of a higher build quality and designed to be light weight. At just under 56 lbs… this is what I would consider very light given how large it looks and the fact that it’s a fat bike with full suspension. It is missing a few things though, no kickstand means it could tip into your fancy car in the garage more easily and no bottle cages mean you’ll need a hydration pack. Part of me yearned for throttle on demand operation in addition to pedal assist but I recognize that this would change the class of the bike, exhaust the battery much faster and ad clutter to the cockpit. It might also delay how quickly the motor cut out resulting in sketchy performance on difficult technical terrain. Yes, this is a hard core capable bike that would handle serious riding. Bosch offers one of the most responsive, zippy feeling drive systems around and if you’re in the highest level of assist (there are four to choose from) it works very well, almost responding like a throttle without requiring exhaustive pedaling force. Almost as soon as you’ve stopped pedaling, the motor also stops and that’s a great feeling… but it works the other way too, responding especially fast as your cadence increases (ie. shifting to lower gears for climbing or maneuvering through an obstacle course of rocks, ice or fauna).

I honestly don’t have many complaints to share about this ebiket. Its great that given just how custom and unique a build it is, BULLS was able and willing to manufacture two sizes. Their two year comprehensive warranty is excellent and despite the perceived higher price point, I actually think you’re getting a good deal relative to what other companies charge for similarly specced builds using less interesting drive systems. Consider their hardtail Monster E model if you’re looking to save $1,000 and don’t mind a stiffer rear… In that case you could always add a seatpost suspension as a compromise. As someone with limited storage space, I tend to choose one high quality bike to “do it all” and that’s exactly what this offers. You get comfort, longer lasting parts and a bike that won’t quite. In a world with more and more 3″ tires it’s great to see an actual full sized 4″ wide fat tire bike that’s done so well. Powerful hydraulic disc brakes, thru axles, a tapered head tube and a custom replaceable metal skid plate make this bike extra tuff. Not to mention the chain tensioner with fully surrounding guide and narrow wide teeth. I love that you can easily and quickly take both wheels off for compact storage and transport and am glad that BULLS opted for the four bar rear suspension design to optimize traction, reduce bob and lower as much weight as possible. It’s a great bike, lots of fun and easy to use. Compared with some other full suspension fat ebikes I’ve tested, it offered a wider range of pedaling speeds while still supporting me with motor power. The motor is just more capable at high RPM and that’s how I prefer to pedal, it happens naturally as I shift down approaching hills, I don’t feel like the motor quits on me. As someone with sensitive knees, this has been one of my favorite fat bikes so far and I’m optimistic about how it could be used on so many terrain types and in so many seasons. Big thanks to Bulls for partnering with me for this review.


  • Custom paint and decal job that includes the frame, rear swing arm and pivot point, suspension fork and rear suspension housing! EVERYTHING matches and looks awesome
  • Sturdy 15 mm thru axle on the front with 12 mm at the rear, keeps the larger heavier wheels tight and responsive, both offer quick release which is handy for repairs or simply transporting the bike since it’s so large
  • In addition to removable wheels, the battery pack and display console are also removable… I love that the battery can be charged on or off the frame and is backwards compatible with the older Bosch Powerpack 400 batteries
  • Top-end components from Magura, Rock Shox, Schwalbe, Ergon and Shimano that will hold up in off-road conditions and are backed by the BULLS comprehensive two year warranty
  • I was impressed that even with the larger capacity battery, full suspension setup and fat tires this bike weighs just ~55 lbs and I love that it comes in two sizes for improved rider fit
  • Most of the weight is positioned low and center across the frame, this improves handling and since it’s a mid-drive, reduces unsprung weight compared to a hub motor
  • You get 11 gears so pedaling feels comfortable at a wide range of speeds… even if the bike is turned off and the Bosch motor offers shift sensing to reduce wear
  • I love that they included a chain tensioner with a full hood to act as a guide (clearing debris and mud), it should reduce kickback from the rear swing arm and the narrow wide tooth pattern is designed to reduce chain slip
  • Punched out rims reduce weight, look cool and might add some cushion to the tires for improved comfort and traction at lower PSI
  • Sturdy metal motor cover… like a louvered push guard on a truck, designed to protect the sensitive bits but be replaceable if you encounter major damage
  • This is the only Bosch powered full suspension fat bike I’ve seen to date and is definitely my preference in terms of power, zip and responsiveness compared to Yamaha and other mid-drive systems, the chainring spins fast and is super quick to start and stop which is great for unstable terrain
  • The Bosch Intuvia display panel is large and easy to read, simple to use and doesn’t require that you reach far while holding the grips to operate, a remote button pad with tactile feedback is mounted very close to the left grip… I also like that the display panels has a Micro USB charging port built into the side for maintaining your portable electronics


  • The bike worked fine in the sand but requires pedaling (Class 1 pedal assist) and there are times when it’s nice to have throttle power just to power through soft terrain or get started again after stopping… the benefit of Class 1 is that it’s allowed on more trails vs. Class 2 throttle powered ebikes
  • The rear suspension joints and shock take up the space where a bottle cage or other accessory mount might have been fit… you can’t add a rear rack easily (unless you compromise with a beam rack) so you might end up using a hydration pack all the time
  • The Bosch battery doesn’t blend in with the frame quite as nicely as the Brose battery on some other BULLS ebike models but it is easier to remove and comes in a higher ~500 watt hour capacity here for longer range rides, I like that the built some metal plates around the base to help it blend in… and added those matching yellow stripe stickers
  • This is an expensive electric bike… you’re getting a lot of high quality hardware but if you ride it near saltwater without rinsing it afterwards or if you’re on other corrosive terrain frequently (salted snow?!) then it will wear out more quickly, there’s a trade-off with bikes like this where you can get one that’s pretty good for half the price and then completely replace it in a year or two vs. one very nice one that you need to care more about to extend


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2 days ago

E-boy , that's an interesting question. I own one, and it's a great bike, so far. I looked at Haibike as THE premium brand. Prices from $2500- 15,000+ puts it in the "BMW" category as far as I'm concerned. That said, I've yet to need warrantee service, replacement parts or factory accessories, so I don't know what to think as a company. I can also say I was NOT prepared to pay full retail for the bike. I can afford 5k for a bike, but I cannot justify the expense. For example: I would love to have a Bulls Monster fs fatty, But there is no freaking way I'm dropping $5,300+shipping and taxes for one , no matter how cool it is. I'm sure that I'm not the only one who feels this way and I'm also sure this is an industry stumbling block bringing new riders to the ebike family.

Joaquin V
3 days ago

Thanks! Got it insured now ;) I was wondering: how tight should I feel the breaks? In a regular bike going at full speed I could break to a full stop in 3,5s. When I'm on this monster, it feels like eternity to stop. Perhaps the breaks are a little loose. Any feedback on this?

Mr. Coffee
1 week ago

@Barkme Wolf - Our family have the Pocket Rocket stoves and like them. We also have a couple of 25 year old Scorpion that still work well but have a hose between stove and gas, so not as convenient although quite small.

Canister stoves are awesome, especially if you are in the boil-water-and-stir school of outdoor cooking.

There are lots of great models out there. I like the ones with a sparker so you don't need to keep track of a lighter or matches.

I've had this little monster for sixteen years (the stove, not the canister):

4 weeks ago

Kudos on the S-Works and Expert. I've had the FSR COMP for about a month now. It's monster green....had to get it due to heart issues. Started out using trail-mode about 90% of the time. Since then, I've gained strength from biking so much and now I use eco-mode about 90% of the time. I have trouble quitting before it gets dark because I'm having so much fun. I'm totally sold on 3 inch tires, they're icing on the cake.

1 month ago

I'm at a state park in pa. I have a bulls monster e fs class one. I was just told by the grounds keeper no motorized vehicles in state parks. Im at Swatara state park in pa. I thought class one bikes were considered regular mountain bikes. Can someone help? Thanks

2 months ago

FXR3, my buddy just picked up a 17 Bulls Monster FS from a LBS at a $200 over preminum, we do support the local economy, but not blindly. The other purchases, they weren't even in the same zip code with pricing, about $800 off. BULLS should contract out to VELOfix or during DEMO Days, have their techs work on customer's bikes. I know Intense Bikes do routine services on ALL Intense bikes during Demo Days, BULLS can do the same.

2 months ago

We just got a 2017 Monster FS with the BOSCH, pick this instead of the Haibike, the Haibike Fat Bike is only made in Yamaha. The 2017 comes with a 500watt pack, basically the same bike as the 16, but with 20% more juice. The suspension is dialed in, super fast on DH, compare to my Haibike Fat Six and Specialized Fat Boy, this bike rocks going up, and super fun coming down. Top notch component group... Buy It!!!!

2 months ago

I received a call today from BULLS today, apparently, they had an emergency meeting to discuss this issue, they are very concern on providing the BEST customer service in the industry. Barney called me right after the meeting, and informed me that BULLS had changed their policy with firmware updates. According the Barney, the limited access was due to insurance and liability issue, they are hoping to resolve this matter ASAP. Barney spoke with me at length and reassured me that I will get the firmware update needed at NO cost.

Stay tuned, I am keeping my fingers crossed! I have a few friends that are in the market to buy new E-bikes, they are on hold to see if BULLS comes thru. I have another friend that picked up 2017 Bulls Monster FS, the quality on Bosch Bike is impeccable, we compared it to a 2016 Haibike Fat Six, the BULLS definitely has a better component group, the welding is top notch. I think their product is superior to Haibike, just need to fix their LBS issues.

Customer Service in this emerging market is critical for newcomers. If you can have a great product backed by great customer service, there is no way you will fail. I hope this sends a loud and clear message to the leadership of BULLS. Unlike 20 years, the flow of information is much faster, customers are much more informed, they need to re-think their business model, hanging your hat on just LBS, might not be a wise business decision, in fact, all it takes is one or two bad LBS, and your reputation is done.

2 months ago

( I've read some places online that say I should make sure to have a pure Sine Wave inverter to recharge the ebike battery. Other places say a modified sine wave inverter is fine. )
you should have a pure sine wave inverter.
this is My experience with a modified sine wave inverter ...
well I'll share my experience with cigar plug inverter, went through 2 vcr's and 1 power brick for my computer, it (cigar plug inverter in my travel trailer ) was not a pure sine wave converter, hence it slowly burnt up me electronic entertainment. so the money i thought i saved my buying a 40 dollar inverter. so buy a pure sine wave inverter .
like i said it burned the stuff out slowly.
now I know why my tv had this buzzing background noise, it was the cheep power inverter .
this is what I purchased
now it's worry free for me using my computer and tv in my travel trailer when camping without campground power.
that old tv commercial rang true to me pay me now of later. cheap inverter or pure one. but at the time I did not know any better because i bought a great brand name one, (monster power) I thought it was a quality product . but i did not know the differences of them,.
just trying too help.

Douglas Ruby
2 months ago

With my changeover to the 11-42 Shimano XT 11 speed on my base Turbo, I went back to the 48T. Personally, I think this is ideal since an 80 cadence gets you to the 40+kmh range in top gear. If you are riding in mountainous terrain and want to pedal monster descents in leg power, up to 54T bcd 104 chain rings can be purchased.

The bigger issue is finding matching bash guards and adjustment slack in the chain retension guard to keep the chain on. I had a pretty tough time finding the 44t bcd 104 bash guard. Most mountain bike guards support smaller chainrings and most road cranks designed for larger chain rings are bcd 110.

3 months ago

Thanks again for the replies. More Noob questions:

How exactly dose a mid-drive motor work and what makes it so much more efficient than a hub motor? Is the motor the only thing that determines power and torque or does the voltage of the batter matter as well? At my size and the need for hills would 350 W with a 36 V battery meet my needs?

Did you guys really order a bike online without riding it first? I can't imagine doing that but I have also found that bike store purchases are way more expensive.

I have ridden one but it was on a lark and I have no idea of the specifics of the bike other than it costs over 2 grand. Rode it around the lot and really liked it but I was surprised that I still needed to work a lot to go up a hill, even in the highest (or is it lowest) setting that gave me the most boost. I really need to make sure I get a bike that can haul me up the steepest hill. We haven't picked out a specific area yet but pretty obvious it will have monster hills and I want to be able to walk out my front door and go bike riding without loading onto a truck and going somewhere.

Thomas Jaszewski
3 months ago

I drive a semi and I recently experimented with 2 sondors. One for me one for my co driver. I wanted to make sure I can build a bike rack that wouldn't damage my truck or the bik5. 2 weeks now everything good. Now I want a bike. Since I sound out revolution x 6 is not legal I need to look elsewhere. I'm looking for power for major off road climbing, full suspension, throttle would be great, 25mph or more something to fall under the radar. I also do a lot of city riding. Tuesday i was in new york ny friday ill be in vancouver bc. most important range. I was looking at monster e FS but it may not be right for me. So I'm looking for a all around bike. Any suggestions would be greatly appreciated thank you.
I missed the location visit, but one of the WORLDS premier bike kit reseller and engineers is in Vancouver. I'd make a stop there and have a conversation with the fellows at Grin. Top shelf people and products if you are building.
Grin Technologies  
950 Powell St #205, Vancouver, BC V6A 1H9, Canada


3 months ago

Trying to do my homework and the Bulls monster e FS and the E-stream evo looks like the best way to go. Between those two Witch would be better? Keep in mind I'll be going from beach to mountain. City to country.

3 months ago

I drive a semi and I recently experimented with 2 sondors. One for me one for my co driver. I wanted to make sure I can build a bike rack that wouldn't damage my truck or the bik5. 2 weeks now everything good. Now I want a bike. Since I sound out revolution x 6 is not legal I need to look elsewhere. I'm looking for power for major off road climbing, full suspension, throttle would be great, 25mph or more something to fall under the radar. I also do a lot of city riding. Tuesday i was in new york ny friday ill be in vancouver bc. most important range. I was looking at monster e FS but it may not be right for me. So I'm looking for a all around bike. Any suggestions would be greatly appreciated thank you.

3 months ago

I'm really thinking what I'm wanting to buy. Originally I was wanting a revolution x 6.0 but now that I know it won't be legal I'm leaning elsewhere. The website for this bike says range up to 134 miles. I know surrounding weight and everything affect it. What is negative about this bike? How does it do in wet weather? Any recommendations? I know I would not mind saving 10k on a bike.

Mr Shax
7 days ago

So the quartz, calcium carbonate or the aragonite does no damage to the bike?

ayan tech 90
2 weeks ago

I wanna buy it can you bring in India I will give 1,000 thousand rupees

Bruno Benadi
3 weeks ago

any good deals

Muzz Macc
4 weeks ago

I like watching these reviews, but I really think that you should be wearing knee and elbow pads. a crash at 20mph is going to hurt.

Patrick Silver
1 month ago

говори по русски заебал

Augustine fast Carbon e-Bikes - Santa Cruz 2017
2 months ago

I have watched a lot of your videos and think you are doing a great job! Keep it up.

Ryan Davidson
2 months ago

Fernando doesn't know how to wear a helmet

3 months ago

I wouldn't want to bring a $500 bike on the beach. No way in hell would I ride a $5000 bike in a salty environment. "That looks fun.. " Yeah, as long as it isn't your own bike.

3 months ago

Just a little detail: All USB ports deliver 5V - what you want to say is how much current (Amps) you get from the USB port. Normally (Laptop) would be 500mAh vs a good phone charger that can deliver up to 3Ah.

J Clar
4 months ago

impressive. Although I wish I was as light as him

Ali Y
4 months ago

how much this can run how fast

DoubleTake Entertainment Media
4 months ago

Save a research click... $5,199.00 | No Sales Tax - FREE Shipping |........ horrible price ratio compared to other models with more power. high end bosch components are not worth the extra cost on this one when compared to models costing $2500 less.

4 months ago

its officially my dream bike but it cost half of my cars worth. mean time i'll stick with my non electric cheap hardtail bike.

4 months ago

What the hell is it in e-bikes that make them cost so much?

Mark Sullivan
1 month ago

Good Li ion batteries and brushless motors are not cheap.

Mike B
2 months ago

Quality. There are plenty of cheap ebikes for you if you dont' care.

Andre N
3 months ago

byteresistor Aluminum & greed

4 months ago

I am curious how you would compare thus bike and it's drive to the specialized Turbo levos

juan jose Lopez
4 months ago

excellent bikes but i dont understand why they have to be so expensive because the motorcycles can be cheaper and the materials are similar, i would like to buy one but its too far from my budget, let me know when they be affordable

4 months ago

just bought the Turbo Levo Fat HT to go with my Fattie6,winter/summer 2 batteries

Grace Dawson
5 months ago

Very disappointing that ebikes are limited to 25km/h in Australia :(

Tom Thumb
6 months ago

Nice Ebike. I want two.

Larry Conger
6 months ago

WOW this bike is amazing. This is the best looking Fat bike I have seen plus the Bosch engine! Full Suspension knock out...