Surface 604 Shred eMTB Review: 2021 Model

What Can You Get From Riding This Throttle e-MTB in 2021?

The Surface 604 Shred has been in the market for some time and now comes with exciting improvements in 2021.


It was built to navigate most terrains, including gravel roads and low to medium challenging trails.


What makes it stand out from similar e-bikes is its 2.8″ thick tires. So, it will handle mud or loose ground better than usual.

As for its classification, this hard-tail e-mountain bike model is a Class 2 throttle on demand and Class 3 speed pedelec.

To make things better, It comes with a one (1) year comprehensive warranty and three (3) years warranty on the frame (directly with the manufacturer).

In terms of how it fits with regulations, it could not be accepted in some countries.


Read More: Electric Bike Laws – Know Them Before Riding.


Bike’s Main Benefits and Limitations

This electric bicycle has many benefits but also limitations. From all of them (discussed further in the review), these are the main ones:



Affordable compared to other electric bikes with front suspension.

The motor has good torque and power, which is great for hills.

The battery is removable, so it will be hard to steal.



It is a heavy bike, but this mainly comes from the battery.

The front suspension is only 100mm travel, so not really great for tackling challenging trails.

The display panel can be a bit bright for night riding. It can’t be adjusted.


The Technical Part

This Shred 2020 version has a total weight of 64.4 lbs (or 29.21 kgs), where the battery weight accounts for 7.1 lbs (or 3.22 kgs).

The high-step frame is an aluminum alloy finished in satin black and grey. In addition, it has two (2) possible frame sizes of 17.5″ and 19″ (rider from 5’2″ to 5’7″ and 5’8″ to 6’6″ respectively).

The handlebar is an alloy low-rise, 650 mm length, with a 6 degrees back sweep and black rubber grips for control.

It also has attachment points for a rear rack and bottle cage bosses, and a sturdy forged alloy seat post.

This bike’s stem is fully adjustable up to 40 degrees, 50 mm long, with a 20 mm stack height (or two 10 mm spacers).

The nine (9) speed drive-train will give you enough cadence to reach the top speed faster.

It is important to note that the two (2) 180 mm hydraulic disc brakes will do the job, but a wider surface would have been better.


604 Shred kickstand and stem


The cranks are alloy-based with sealed bearings, tapered spindle, and a 38-teeth chain ring.

The frame fork has a 30 spring front suspension (old-style though), a lockout and preload adjusting compression system, and 100 mm travel.


Disk brakes and small gear hub motor


As mentioned at the start, we can all agree that great bike tires are essential for optimum riding performance.

The rims are made of double-walled aluminum alloy with a black finish.

The stainless steel spokes have 13 and 12 gauges for the front and rear respectively, and each wheel size measures 27.5 inches in diameter and 2.8 inches in width.

These plus-sized tires are built to contain between 20 to 31 PSI (or 140 to 240 KPa) for the steady handling of rugged terrains.

Lastly, we love that the brand added some accessories, including a headlight and a kickstand; however for a fully eMTB, these accessories should not be fitted.

The above statement confirms that using it as a downhill bike won’t be ideal, just easy off-road terrains.


Electronic & Power Specs


500watts Motor

The 604 model has a hub gear motor with 500w output power and the potential to max out at 750 watts.

As you see, this power output won’t be ideal for Australia and most European countries.

This motor also has 50Nm of torque for incredible response.


Read motor with 500watts standard output and 750w extended.

Considering the power performance, it is a shame that the motor doesn’t give more torque.


Top speed

The motor will get you approximately 28 mph (or 45 kph) for the adrenaline lovers.

The throttle system can reach that speed quickly, but remember that the battery will die sooner than expected.


48V battery and extended

As with any other e-bike in the market, it’s essential to consider the battery life and charging speed.

The lithium-ion Samsung battery consists of 48 volts and 14 amp hours, with the capacity to store almost 500-watt hours.

The total charging time is six (6) hours to reach maximum capacity.


There is an alternative if you require more battery power. You can upgrade to a 700watts, which is 48V and 20amps. 


This standard battery yields between 20 to 45 miles (or 32 to 72 km), whereas the extended option will give an average range of 65 miles (105 km).


48v battery for ebikes with throttle system

LCD Bafang controller

The highly interactive backlit monochrome display gives updates on the battery level, current speed, and assistance mode.

You will also be able to track your trip and total distance, as well as your average and maximum speeds – which are great for bragging rights afterward.


Bafacng controller with LCD screen for eMTBs


Advantages and Disadvantages

The initial review depicts a mix of advantages and disadvantages. However, let’s first consider the cons.


Things to improve on!

– The display panel can be a bit bright for night riding and is not removable – although it has some degree of tilt.

– The adjustable handlebar is comparatively shorter than exclusive mountain bikes, and its flexibility can reduce the degree of control on rugged terrains.

– This is a heavy electric bike, and most of its weight comes from the front suspension and battery.

– The battery position is a bit low, which could hinder access for charging.

– The location of the headlight and the kickstand means that they will likely bounce around a lot on rough surfaces.

– A bit of finesse is also required for maintenance, as the shifting and motor power cables are closely placed.

We know there is a lot to consider with the cons however, there are essential pros that can provide the answers you need.


Good stuff!

– Looking at other models with similar characteristics, it is relatively affordable.

– It has a good weight distribution throughout, with cables integrated into the frame and motor inhibitors in place for safety.

– The motor exhibits a sufficient torque with very responsive top and bottom cadence sensors, and there is no resistance or mashing when shifting.

– The headlight has intense beams, so should be no issues at night.

– The hard-tail, the add-on rear rack, and bottle cage make it a good alternative for urban use too.

– The battery can be removed for separate charging, lasting long enough to sustain long trips between full cycles.

– This electric bike supports multiple upgrades to critical areas, such as the suspension fork.

– This model has excellent support for its large tires, as its rims and spokes are also larger than usual to accommodate them.

– The weight capacity of 285 lbs also makes it a good option for all riders.

Last but not least, you can adjust the top speed on this electric bike to suit the particular trail requirements.


Purchasing Considerations

The flexibility of this bike across various terrains makes it a great value for riders who bike-commute and ride for fun.

It is also affordable relative to other exclusive mountaineering bicycles such as the Savadeck Knight 9.0.

The adjustable frame heights make it suitable for riders from 170 cm to 190 cm.

Overall, we believe this Surface 604 Shred electric mountain bike with a throttle could be a good option for most off-road and city-type rides.

Images courtesy of Surface604 bikes.

Surface 604 Shred


Frame & Components Quality


Braking Performance


Speed & Torque


Controller & Assistance


Battery Range


Overall Weight


Portability & Maneuverability




Paul T

Hi all! I'm Paul, founder and driver of Electric Bike Advisor (EBA). Learning from scratch by repairing and putting together my standard bicycle, I thought it was time to know more about the electric world. Enjoy reading my most honest point of view through our reviews, and learning from our guides, which are researched by professionals in the industry.