I don’t know if EFT-MTB is a real acronym, but in this post, it stands for Electric Fat Tyre Mountain Bike.

Last year, Jo and I bought the Cyrusher XF900 Electric Fat Bike. It is a monster-sized electric bike in every sense of the word. Big wheels, shocks, a large handlebar and a lot of power from the back wheel.

Cyrusher XF900 Specifications.

The bike has huge fat tyres, is 4 inches wide and can tackle any kind of terrain.

The bike has a speed of 28 mph (faster if one hacks the controller) and a long-distance reach of 62 miles (cough) thanks to its 750W Bafang motor, 1500W max output with 48V 17AH battery.

It has three modes.

  1. Normal bike mode (pedaling).
  2. Pedal-assist, which uses that powerful Bafang Motor.
  3. Pure electric (throttle – like a motor bike).

To stop the bike there are Star-Union full hydraulic 180/203 mm disc brakes on the front and back. There is also a clever motor cutoff when the brakes are applied.

Putting the Cyrusher XF900 EFT-MTB to the test.

We’ve been on a few cycles in the past couple of months to Caterham and along the North Down Way, but nothing too far from home and this time, I wanted to test the range. As mentioned, Cyrusher claim this bike can go 62 miles, but in reality, that is probably half that distance granted; not every ride is in perfect flat conditions.

I used the Footpath app to draw up a route we could cycle along. If you’ve not tried out this awesome app, you must. It has so many fantastic options for cycling and walking and at least a dozen different maps to choose from, such as an ordinance map, Mapbox outdoors, topo, and maps showing where the cycling paths, bridleways, right of way, and footpaths are.

Once the route is plotted, one can save the route, preview or playback it with voice or export it to other map apps. It also has turn-by-turn voice directions, which is great if you have a headset built into your helmet (Sena M1 Evo).

I planned a route mostly through the countryside along bridlepaths and country lanes. Unfortunately for us (or fortunately), depending on how one sees the challenge, it had recently rained, and the paths were not quite up to our EFT-MTB skill levels. It started well as our header’s photo shows amazing views and wide paths between the fields. We even stumbled upon a field full of deer. Fifty of them stood around waiting for Bowen to snap a photograph or three.

However, the path soon turned into a nightmare for Jo, who wasn’t confident enough to tackle the deep muddy pools dotted along the path.

Deep muddy pools surrounded by brambles and thorns

The way I tacked the muddy pools was to open the throttle slightly and, with one foot touching the bank, let the bike slowly and steadily move through the mud. It was very slippery, and a little balance was needed. In some places, though, the path was overrun with massive bramble thorns that were ankle, knee & arm high, and one wrong move meant being ripped to pieces. That wasn’t fun.

The enjoyment ended after 2 miles, and we had another 23 miles to go, according to the map. It wasn’t all bad, and there were quite a lot of lanes and gravel bridleways through lovely forests and farmlands, but there were a lot of muddy paths up & down steep, slippery hills, which made our progress very hard.

Long faces in a field
Look at the long faces, clearly not happy to see Bowen

Four hours later, and with tensions running rather high, we arrived home in complete darkness. It was raining and cold, and the bikes were covered in mud.

A filthy Cyrusher XF900 hanging on the wall

Battery Status for the Cyrusher XF900 EFT-MTB.

The status on the battery when we got home was 2 bars out of five (40% remaining), which I thought was quite impressive. The status changed throughout the ride depending on the terrain and the electric mode we were in at the time. On steep hills or through the mud, the status of the battery would drop down to 1 or 2 bars but quickly bounce back to 4 or 5 bars on level surfaces. This was a little confusing.

From what I have read about the bike, if one rides in PAS 1 or 2, it is possible to get at least 40 miles out of the battery, and those were the two modes we were using. At no time, though, did I feel we were almost out of battery, and I am confident the bike could have easily got to 30 miles or more if there were no big hills.

You can see in the chart below we did some fairly steep climbs towards the end of the ride, which was not ideal given how sore, frustrated and tired we were.

Elapsed Time Moving Time Distance Average Speed Max Speed Elevation Gain Calories Burned
03:31:40
hours
02:33:57
hours
24.34
mi.
9.48
mph
29.21
mph
1,401.57
ft.
1,831
kcal
blank

Sena M1 EVO.

We got these smart helmets from Sena, which are simply awesome. They allow Jo and I to communicate even if we are hundreds of metres apart. Not only can I listen to the turn-by-turn instructions from the Footpath app, but I can also alert Jo of a pothole or deep hole or a muddy path surrounded by thorns (don’t fall) without having to be there shouting the instructions to her. They are extremely useful even on the road. The helmet also has safety lights on the back that can be used for day and night riding to alert drivers.

The smart SENA M1 EVO built for safety, comfort & style
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Mike

Mike is an Android man, researcher of all things good and bad, likes all wheeled sports, loves gadgets, enjoys all music, into home automation, likes Samsung, voted Brexit, enjoys talk radio, has a Brompton electric bike, drives a Tesla Model 3, is a hard worker, a passionate self-educator, crazy about drones, a gambler, blogger for over 20 years, enjoys gardening, Microsoft over Apple, an investor in stocks and cryptocurrency, a homeowner, a futurist, married for life, has family all over the world, a cat man do, loves beer, travel & life.

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