EFT-MTB, which in this post means for electric fat tire mountain bike, may or may not be a true acronym.
I purchased the Cyrusher XF900 Electric Fat Bike last year. In every respect, it is a monster-sized electric bike. Huge bars, large wheels, shocks, and a lot of back wheel power.
The bike is 4 inches wide, has enormously fat tires, and can travel over any surface.
The bike’s 750W Bafang engine, 1500W maximum power, and 48V 17AH battery enable it to go 62 miles at a speed of 28 mph (faster if the controller is modified).
Cyrusher is one of the businesses that has capitalized on this trend. Since 2015, they have been selling e-bikes on the global market and have established a reputation for themselves around the world. The XF900 is their newest product.
But why should you pay attention to this e-bike in particular when there are so many others available? Let’s start by stating that Cyrusher is best recognized for producing inexpensive e-bikes. Not simply inexpensive ones that you’ll replace the next year. You’ll discover why they’ve even created their own cult meeting.
| Motor | 750-watt Bafang |
| Battery | 48 volt 17 amp-hour |
| Max Load | 330 lbs (150 kg) |
| Range | 62 miles (100 km) |
| Rider Height | 5'7" ~ 6'6" (170cm ~ 200cm) |
| Included | Battery, charger, air pump, assembly toolset, assembly guide, battery manual, user manual, free stickers |
| Warranty | 2 Years |
| Motor | 750 watt (1500 watt peak), 80 N.m Bafang electric motor |
| Battery | 48 volt 17 amp-hour Samsung lithium battery. Waterproof IP65 (included) |
| Range | 50~62 miles (80~100 km) |
| Charger | Standard 110V~240V AC, 54.6V 2Ah Smart Charger (included) |
| Battery Charge Time | 5~7 hours |
| Battery Lifetime | 800 charges |
| Frame | 6061 Aluminum full suspension frame |
| Controller | JYTcon brushless motor controller 36/48V 1500W, mas output 25 amp, motor phase angle: 120, current: 22+-1A |
| Display | 3.7" LCD display, Smart Computer |
| Tires | Chaoyang 26" x 4" puncture-resistant fat tires |
| Spokes | 12-gauge stainless steel |
| Saddle | Breathable ergonomic sport cushion seat |
| Seat post | Adjustable height |
| Crank | 170mm forged alloy dual-sided aluminum |
| Rear Derailleur | Shimano Tourney PD-TY300, 7 |
| Throttle | Half twist throttle |
| Front Light | 250 lumen LED |
| Brake lever | Tektro/Zoom anti-slip grip levers with motor cutoff switch |
| Brake | Tektro/Zoom hydraulic 160/180mm disc brakes front + rear |
| Transmission | Shimano M2000/M315 gear shift system 7 |
| Front Suspension | Suspension fork with lockout and adjustment |
| Rear Suspension | Spring suspension 165x750 lbs 3 mags |
| Bike Weight | 66 lbs (30 kg) / 74 lbs (34 kg) with battery |
| Bike Dimension | Height 33.5”-41.3“ (85-105 cm) / Length 76” (193 cm) |
| Packing Size and Weight | 59x12x32in 83lbs (150x30x80mm 38Kgs) |
| Total Payload Capacity | 330 lbs (150 kg) |
Cyrusher XF900: Design
Its first design attempts to mirror that of motorbikes, but I don’t think she entirely succeeded. It still has a few features, though, so it still gets a lot for her money. It is similar to the majority of other e-bikes in that it has an aluminum frame to provide the highest level of durability while minimizing weight.
With the Everest XF900, you can climb any mountain in your way. The Everest XF900 is capable of traveling wherever your travels lead you, whether you’re climbing actual mountains or simply traversing a metropolitan jungle. We started with the motorcycle-inspired design we adore and worked our way up from there.
The motorcycle-style double-crown front suspension fork, which is far more durable than a standard bicycle suspension fork and gives away the Cyrusher Everest XF900’s tough use, is immediately noticeable.
The bike’s subdued rear shock, which completes its full-suspension design, is far less striking.
Two Tektro hydraulic disc brakes bite down on 180 mm rotors to provide stopping power.
The suspension and the fat tires make it simple to attack barriers that a hardtail e-bike with 2-inch tires would never contemplate.
The front and rear suspensions are both middle of the road; they lack the top-tier components seen on e-bikes that cost almost twice as much. However, they work well enough for leisure riding, which is precisely what I wanted.
A 250 lumen headlight, an LCD display, and anti-puncture tire liners in these 4-inch fat Kenda Juggernaut tires are all standard equipment on each model.
Just one thing stopping my path was a set of derailleurs that were grabbing bushes and grass. Only a small number of e-bikes have several front chainrings, including this one. Although the 21-speed arrangement is intriguing, it seems superfluous.
The benefit of so those gears is primarily seen at the bottom end, where you may shift into lower speeds for greater torque while descending hills. With such a strong motor, though, you actually don’t need to go so low because you’ll already be rising more quickly.
The bike has 180/203 mm Star-Union complete hydraulic disc brakes on the front and back to help it stop. When the brakes are engaged, a sophisticated motor cutoff also exists.
The XF900 is unique in that it has full suspension as a ride. The XF900 incorporates a spring rear suspension that can withstand a hammering of 750 lbs, unlike other e-bikes that look to be all-purpose machines. Other bikes of this type don’t have a rear suspension because having one tends to reduce your pedaling efficiency. Specialized, a leading manufacturer of bicycles, is one example.
The front fork is a component of the suspension that also makes a design reference to motorcycles. But because there isn’t much information available, I assume it’s largely for aesthetic reasons. I’m not denying that it has suspension capabilities; I’m just not sure how useful, effective, or even required it would be for a bike of this type.
Cyrusher XF900: Motor and Driving
This beast can propel you along at 15 to 31 mph while continuously pumping out 750 W with occasional 1500 W peaks (24-49 kph). However, given that such speeds are obviously not intended for mountain riding, the rear suspension may have been dropped.
Similar to the majority of e-bikes with 750W steady scores, the motor is sort of actually putting out a little bit over 1,000W peak, which ostensibly aids the bike in reaching its advertised top speed of 28 mph (45 km/h).
There are three modes.
- Standard bike mode (pedaling).
- A pedal-assist system that makes advantage of the powerful Bafang Motor.
- Absolute electric (throttle – like a motor bike).
In the last several months, we had taken a few bicycle trips, but they haven’t taken us too far from home. This time, I wanted to test the range. As previously indicated, Cyrusher claims that this bike can travel 62 miles, but in practice, that mileage is probably just around half that given that not every ride is on ideal flat terrain.
The bicycle is a perfectly competent road fighter and trail breaker at such speeds. On the trail, I don’t typically reach my peak speed, but on the wide road, I have the space I need to run quickly. Back on the hills, I consider it pretty dang fast if I reach a speed in the mid-20s.
By gradually opening the throttle and letting the bike go through the mud with one foot on the bank, I was able to maneuver the puddles. A little bit of balance was required because it was so slick. But in certain spots, the road was covered with enormous bramble thorns that were arm, knee, and ankle high, and one mistake meant being torn to shreds.
According to the chart, we still had 23 miles to travel after 2 miles of delight. There were quite a few lanes and gravel bridleways that wound through beautiful forests and farmlands, so it wasn’t all horrible, but there were also many muddy routes that wound up and down steep, slippery hills, which made our progress quite difficult.
This is due to how fast the Cyrusher XF900 is. It has a peak speed of around 28 mph (45 km/h), and can reach that speed either by pedaling or using simply the throttle. If an e-bike can go faster than 20 mph on the throttle, it is technically not a class 3 e-bike, but nobody stopped to question and I didn’t offer that information to anybody.
Finding the ideal cadence is also made simple by the enhanced granularity. Yet again, on such a strong e-bike, that just seems superfluous. Maybe the purists may like the extra speeds, but I mostly kept the bike in the highest gear the entire time.
Cyrusher XF900: Battery and Range
Along with a 13Ah (624 Wh) battery and a 17Ah (816 Wh) battery, there are other 48V Samsung battery options.
When we arrived at our house, the battery had two out of five bars, or 40% of its capacity, which I found to be rather outstanding. Depending on the terrain and the electric mode we were in at the time, the status fluctuated throughout the journey. The battery status would dip to 1 or 2 bars while climbing steep slopes or through muck, but would immediately rise to 4 or 5 bars when the terrain was flat. This made a tiny bit of sense.
According to what I’ve read about the bike, riding in PAS 1 or 2 should allow for at least 40 miles of range, and those were the two modes we were utilizing.
But I never had the impression that the charge was running low, and I have no doubt that the bike could have easily traveled 30 miles or more if there hadn’t been any significant inclines.
The chart below shows how we ended the bike with some quite steep hills, which was not ideal considering how uncomfortable, annoyed, and exhausted we were.
Cyrusher XF900: Conclusions
I’ve only tested one Cyrusher e-bike so far, the Cyrusher XF650 (overview video below), but it was a fun, though little absurd, big tire e-bike. Cyrusher creates enormous, extravagant electric motorcycles at reasonable prices. They aren’t as high-quality as finer European e-bikes, but in terms of components, they seem to be on level with many of the major US brands.
The bumpers are as inexpensive as they get, but I understand that finding fat tire fenders on an e-bike with full suspension is a tough nut to crack. The great news is that because of the rear rack, the back doesn’t flap around too much. It becomes a little floppy in the front. This is inexpensive plastic for you.
But it kind of raises Cyrusher’s difficulty for them. There are several full-suspension fat tire e-bikes on the market, but this is one of the few that is truly priced to start around $2,000. And that’s quite amazing, especially when you consider the bike’s rapid pace and solid but not exceptional components.
The front lamp is great, but I’m annoyed about the back tail light. It isn’t your standard primary battery-operated e-bike light. Instead, it is a battery-operated saddle light. That has two primary drawbacks: if you frequently ride at night, the battery will need to be replaced, and if you load the back rack, the battery will become clogged. Additionally, I noticed that I occasionally clicked the button when I lifted the saddle to move the bike. It could run for hours during the day and run out of battery by the time I needed it at night if I didn’t realize that I had unintentionally clicked on the light.
Choosing the former results in a sale price of $1,999 while choosing the latter raises the cost to $2,499 The more expensive model also has a rack, fenders, and a rear LED taillight in addition to an upgrade from a 7-speed Shimano transmission to a 21-speed one. These accessories are optional for the less expensive mannequin.
