2018 Surface 604 Colt Review

2018 Surface 604 Colt Electric Bike Review
2018 Surface 604 Colt
2018 Surface 604 Colt Bafang Planetary Geared Hub Motor 500 Watt
2018 Surface 604 Colt 500 Watt Hour Samsung Ebike Battery
2018 Surface 604 Colt Bafang Dpc07 Lcd Display
2018 Surface 604 Colt Rubber Ergonomic Grips Trigger Throttle Button Pad
2018 Surface 604 Colt Sr Suntour Xct 80 Mm Suspension Fork
2018 Surface 604 Colt 160 Mm Hydraulic Disc Brakes
2018 Surface 604 Colt Shimano Altus 9 Speed
2018 Surface 604 Colt Integrated Rear Rack Backlight Kickstand
2018 Surface 604 Colt 2 Amp Electric Bike Charger
2018 Surface 604 Colt Electric Bike Review
2018 Surface 604 Colt
2018 Surface 604 Colt Bafang Planetary Geared Hub Motor 500 Watt
2018 Surface 604 Colt 500 Watt Hour Samsung Ebike Battery
2018 Surface 604 Colt Bafang Dpc07 Lcd Display
2018 Surface 604 Colt Rubber Ergonomic Grips Trigger Throttle Button Pad
2018 Surface 604 Colt Sr Suntour Xct 80 Mm Suspension Fork
2018 Surface 604 Colt 160 Mm Hydraulic Disc Brakes
2018 Surface 604 Colt Shimano Altus 9 Speed
2018 Surface 604 Colt Integrated Rear Rack Backlight Kickstand
2018 Surface 604 Colt 2 Amp Electric Bike Charger


  • A value-priced, hybrid electric bike with plastic fenders and a chain cover to keep you clean, integrated LED Lights to keep you seen, and an adjustable suspension fork and stem to improve comfort and fit
  • High-step diamond frame improves strength and stiffness but also slopes for easier mounting and comfortable stand-over position, integrated rear rack feels sturdy, includes pannier hangers and bungee loops
  • Available in two frame sizes, most of the wires are internally routed, pedal assist feels smooth and natural because it uses a torque sensor, variable speed trigger throttle, hydraulic disc brakes feel powerful and smooth
  • The tires are pretty basic (no puncture protection or reflective stripes), plastic fenders are durable but usually rattle more than steel or alloy, headlight is mounted to fork arch and may bounce around, great kickstand, optional suspension seat post

Video Review



Surface 604





Body Position:

Upright, Upright Relaxed

Suggested Use:

Neighborhood, Urban, Commuting

Electric Bike Class:

Throttle on Demand (Class 2)
Learn more about Ebike classes


1 Year Comprehensive, 3 Year Frame


United States, Canada

Model Year:


Bicycle Details

Total Weight:

55.7 lbs (25.26 kg)

Battery Weight:

7.5 lbs (3.4 kg)

Frame Material:

6061 Aluminum Alloy

Frame Sizes:

17.5 in (44.45 cm)19 in (48.26 cm)

Geometry Measurements:

Medium / Large: 19" Seat Tube Length, 23.25" Reach, 28.75" Stand Over Height, 33.5" Minimum Saddle Height, 25" Width, 70.5" Length

Frame Types:


Frame Colors:

Satin Black

Frame Fork Details:

SR Suntour XCT with 80 mm Travel, Compression Adjust with Lockout, Preload Adjust, 100 mm Hub Spacing, 9 mm Skewer with Quick Release

Frame Rear Details:

135 mm Hub Spacing, 12 mm Axle with 10 mm Flats Threaded with Nuts

Attachment Points:

Rear Rack, Fender Bosses, Bottle Cage Bosses

Gearing Details:

9 Speed 1x9 Shimano Altus Derailleur, Shimano CS-HG200-9 Cassette 11-32 Tooth

Shifter Details:

Shimano Altus Triggers on Right (One-Way High Lever, Three-Shift Low Lever)


Prowheel, Forged Alloy, Sealed Cartridge Bearings, Square Tapered Spindle, 44 Tooth Chainring


Wellgo Aluminum Alloy Platform with Rubber Tread


Integrated, Sealed Cartridge, Straight 1-1/8"


Satori UP2, Alloy, Adjustable Angle 0° to 90°, 10 mm Stack Height, One 10 mm Riser


Zoom Aluminum Alloy, Low-Rise, 630 mm Length, 7° Backsweep

Brake Details:

Tektro Auriga Hydraulic Disc with 160 mm Rotors, Dual-Piston Calipers, Three-Finger Tektro Levers with Adjustable Reach and Motor Inhibitors


Rubber Ergonomic, Black


Selle Royal Free Way, Gel

Seat Post:

Alloy, Forged Head

Seat Post Length:

300 mm

Seat Post Diameter:

30.4 mm


Double Wall, Aluminum Alloy, 25 mm Outer Width, 36 Hole, Black


Stainless Steel, 13 Gauge Front and 12 Gauge Rear, Adjustable Nipples, Silver

Tire Brand:

Kenda Kranium, 26" x 2.1" (54-559)

Wheel Sizes:

26 in (66.04cm)

Tire Details:

40 to 65 PSI, 2.8 to 4.5 BAR, 280 to 450 KPa

Tube Details:

Schrader Valve


Plastic Fenders Black, Plastic Chain Guard with Reflective Side, 5 Volt 1 Amp USB Type A Charging Port at Top Right Side of Battery, Integrated Spanninga Kendo LED Headlight, Integrated Spanninga LED Backlight, Welded-On Rear Rack with Pannier Rods, Rear Mounted Adjustable Length Kickstand, Optional $99 SR Suntour NCX Suspension Post with Shim


Locking Removable Downtube Mounted Battery Pack, Waterproof Grade IP65 Display Panel, 1.8 lb 2 Amp Charger

Electronic Details

Motor Brand:


Motor Type:

Rear-Mounted Geared Hub
Learn more about Ebike motors

Motor Nominal Output:

500 watts

Motor Peak Output:

750 watts

Motor Torque:

65 Newton meters

Battery Brand:

Samsung 18650

Battery Voltage:

48 volts

Battery Amp Hours:

10.4 ah

Battery Watt Hours:

499.2 wh

Battery Chemistry:


Charge Time:

6 hours (2 Hours for ~80%)

Estimated Min Range:

25 miles (40 km)

Estimated Max Range:

60 miles (97 km)

Display Type:

Bafang DPC07, Fixed, Backlit, Monochrome LCD


Battery Level (10 Bars), Speed, Assist Mode (0-5), Trip Distance, Total Distance, Average Speed, Max Speed, (Includes 5 Brightness Settings, Walk Mode)

Display Accessories:

Independent Button Pad near Left Grip, Buttons: +, -, Information, Lights, On/Off, (Hold - for Walk Mode, Double Tap i for Settings Menu)

Drive Mode:

Torque Sensing Pedal Assist, Trigger Throttle (Sealed Bafang Strain Sensor BB)

Top Speed:

20 mph (32 kph)

Written Review

EBR charges a service fee to manufacturers to produce ebike reviews and videos, this began in 2018. It’s the same flat fee for each bike, and it helps us to keep the site going while limiting ad clutter. We appreciate the opportunity to serve you with our opinions and data but respect your right to know that we receive compensation :)

Surface 604 is an electric bike company that has been in business since 2013, selling to both the United States and Canada. Their products emphasize value pricing but often mix in higher quality components like hydraulic disc brakes, a sealed torque sensing bottom bracket, integrated lights, and a highly adjustable suspension fork in this case. You can find and test ride their bikes at a broad network of dealers and online direct (if you don’t live near a dealer). What I love about the Colt, and it’s step-thru sibling the Rook, is that together, they offer two frame styles and a wide range of fit options as well as two colorways. The Colt is going to be stiffer, sturdier, and a bit easier to hang on some car racks. It comes with a highly adjustable stem from Satori and there’s plenty of room to lower the saddle height without colliding with the rear cargo rack. Even with the “high step” tubing, there’s still a lot of clearance for mounting and standing over the bike because it’s sloped down. I measured the standover height on the Large 19″ frame at ~28.75″. Surface 604 has really nailed the little details on this e-bike by including bottle cage bosses along the base of the downtube (yes, not the most convenient to reach but better than skipping them), and designing a rack with narrow-gauge pannier hangars for use with quick connect clip-on bags like this. Of course, at this price point, not everything is perfect. The front fender is a bit close and can zip and jitter when riding over rough terrain, the tires are pretty basic (no puncture protection or reflective sidewalls), and the trigger throttle is limited in power and speed by the level of pedal assist that you choose. Still, for a bike that comes with a comprehensive two-year warranty and rides this well, I feel that it’s a great value… and I like how it looks, the graphics and branding elements are understated and the satin paint hides fingerprints but isn’t obnoxiously glossy. Cables are internally routed through the frame and the motor doesn’t produce much noise for how powerful it is.

The motor driving this electric bicycle feels smooth and accelerates steadily but still provides great torque and power. I’m not sure on the model number, but it’s made by a company called Bafang. I have seen their products installed on many other electric bikes over the years and come to trust them. This motor is silver, and matches the thicker 12 gauge spokes that support the rear wheel. The rims are double walled alloy and painted black to blend in with the tires. I’ve already griped about the tires a bit, but they aren’t all that bad… I appreciate the 26″ diameter because this lowers the frame a bit compared to 27.5″ or the most common 28″ city size. Smaller wheels do have a higher attack angle however, which means that they won’t span cracks as efficiently. The fatter 2.1″ diameter adds air volume for comfort and stability. The bike felt stable and tracked nicely, even when I was riding with no hands. I have been on some cruiser style ebikes that suffered from speed wobble, where the front wheel would shake back and forth at certain speeds. I did not encounter that here, and I feel that the combination of lowered weight and stiffer frame design (with the diamond frame style) provides strength and stiffness. It’s nice to have your pedal power instantly transferred into the drivetrain of a bicycle, and it’s empowering to feel quick steering response, but your body will still be cushioned by the tires, front shock, ergonomic grips, and gel saddle. For those who want even more comfort, Surface 604 sells a nice suspension seat post for $99 with a shim to make it fit the seat tube perfectly. Considering that the motor can propel this ebike up to 20 mph (32 km/h) in the highest level of assist, it’s something I would strongly consider for myself. Shops that sell both regular bikes and e-bikes frequently tell me that the e-bikes get significantly more use and are ridden for longer periods of time… because they are more fun or more practical for commuting. This motor should support upwards of 25 miles per charge, and maybe as high as 60 miles, depending on the level of assist you choose, how much you use the throttle, and how actively you pedal. But, because it uses a torque sensing bottom bracket, you are forced to push at least a little bit to get the motor working in pedal assist mode. It’s actually very satisfying, because the bike responds naturally, there’s less surprises. Some of the older Surface 604 models (and many current cheaper models) use cadence sensors that produce an on/off feeling that can be a bit startling if you accidentally move the crank arm for stability. The strain/torque sensing unit is built into a plastic casing that’s fitted onto the left side of the bottom bracket, and it seemed well sealed against water. In summary, the motor and pedal assist system worked very well for me on this electric bicycle, I only wish the throttle could go full power without having to click the control pad to raise the level of assist. That said, the default assist level that comes up when the bike is powered on is level 1, so the throttle is live instantly. It’s nice to know that if you do accidentally bump the throttle, the bike won’t be zooming away on you with full power.

Powering this bike is an above-average capacity 48 volt 10.4 amp hour Lithium-ion battery pack with name brand Samsung cells. It weighs a bit more than average at 7.5 lbs because of the sturdy alloy casing, but I love that it offers a USB charging port on the right hand side. This port can be used whether the battery is mounted to the bike or stored separately, acting as a backup power source. With nearly half a kilowatt hour of electricity on hand, there’s plenty of support for the hub motor, lights, backlit display, and accessories. The motor is rated between 500 watts and 750 watts, producing up to 65 Newton meters of torque, which is quiet good for how small and quiet it is. This sort of performance uses energy faster however, so it comes back to which level of assist you choose, how often you use the throttle, and the torque sensor setup. For me, it’s just nice to know that this thing can climb pretty well (I experienced this with some of the grassy hills on a golf course I rode through for the video review of the Rook above). Some ebikes feel zippy, and others feel subtle and sort of build power. This one offered a good mix of both sensations, and I attribute it to the torque sensor and more powerful drive system. The battery pack seats into the frame dock from the left side of the bike and comes in at an angle. This allows space in the main triangle for mounting a frame bag or water bottle adapter. The frame tubing protects the pack from kicks and scratches, but the alloy casing seemed pretty tough all on its own. There’s a spring-loaded key slot on the left side of the downtube, which unlocks the battery. And, you pull a lever to release and lift it up. I like having the lever because it provides more secure lifting and carrying. High capacity battery packs like this are expensive and can be damaged if dropped or left in extreme hot or cold temperatures. I have read that the cells are least stressed when filled between 20% and 80% and the display panel has a better than average 10-bar charge level infographic to help you estimate your range and time the next charge. The charger itself is pretty basic, just a standard, lightweight, two-amp charger. You could easily fit it into a trunk bag and bring it with you for quick fill-ups at the office or a friend’s house.

I like the display that was chosen for this bike, even though it’s not removable. It just seems solid and tough… I recently saw the plastic hinge on a much fancier $4,800 ebike display crack and break during careful routine service, and quickly came to appreciate how some brackets can swivel and be removed without weakening. We fixed that display by using zip ties :) Anyway, the display that comes with the Rook and Colt does swivel easily (to reduce glare while riding), has a very large inset LCD that is easy to read at a distance, and has an intuitive and reachable button pad to interact with. This display isn’t trying to hide, it just works well. The top left section has a 10-bar battery indicator, there’s a speed readout near the top right, your current level of assist (0-5) is shown at the very bottom, and a bunch of trip stat menus like trip distance, odometer, max speed, etc. are listed in the middle. The bike starts in assist level 1 but you can use the minus key to go down to zero and pedal without assist or throttle active. This mode is useful for keeping track of ride stats and running the lights. The lights are pretty neat, in my opinion, because they will activate automatically based on how dark it is outside, or you can manually switch them on by holding the light icon on the button pad. The plus button raises assist, holding the power button turns the display on and off, and the i button cycles through stats or enters the settings menu if you tap it quickly two times. From here, there are several options including: Data Reset, Units (Metric or Imperial), Light Sensitivity (for the headlight and backlight), LCD Backlight Brightness, Automatic Off Timer, Maintenance Warning Settings, Password, Wheel Diameter Settings, and Top Speed Adjustment. I don’t think you can adjust the wheel diameter or top speed adjustment without the password, and that requires contacting the company. Some of the older Rook and Colt models could reach higher top speeds, but that’s technically illegal for many bike paths and it wears the motor out faster. Many shops have told me that customers often want to ride slower than 20 mph, and you can achieve this by limiting which level of assist you select: Level 1 is ~6 mph, 2 ~9 mph, 3 ~14 mph, 4 ~17 mph, and Level 5 is ~20 mph. I just appreciate that there is only one power button to press in order to activate the display panel… that it seems tough and water resistant, and that you don’t have to memorize fancy button combinations to get things working. More buttons makes it simple and intuitive. The one secret you might be interested in however, is that holding the minus key will activate walk mode. This allows the bike to help you move through grass, up ramps, or limp home in the event of a flat tire. Do keep an eye on the tire pressure though, because it’s easier to get a pinch flat if you allow it to drop below the recommended 40 to 65 PSI and run into a sharp curb or rock.

There’s a lot to explore with this product, I appreciate the decisions that were made to keep it affordable but not cheapen the parts and performance too much. Surface 604 is based in Vancouver Canada, where it rains, and it seems like they have made sure that the bike will stand up to wet conditions. The 9-speed cassette gives you lots of pedal speed options, and the Shimano Altus derailleur is a step up from entry-level. It looks pretty nice, is positioned out of the way (tucked under the right chain stay), and uses faster trigger shifters vs. the big thumb shifters on many other products. The cockpit on this ebike is fairly clean, even with the big display, trigger throttle (which is easy to reach and offers variable speed output depending on how far you press), and ebike specific hydraulic disc brake levers. Whenever you brake, the motor instantly shuts off. It’s a great feature, and one that is often skipped when torque sensing assist is implemented… because it’s already so much more responsive than cadence sensing. Yes, the grips are pretty cheap, they don’t lock on and could spin if you really bear down. Thankfully, they are fairly comfortable and could be upgraded significantly for just $20. While exploring the bike closely, I noticed what appears to be a stainless steel insert at the rear dropout to protect the softer alloy frame from motor power being exerted through the axle. I also saw how they organized the power cable for the motor (which is a bit exposed) so that it’s not interfering with the derailleur cable or rear light power cable. Be careful not to let the bike tip onto the right side, because this is where the fancier bits are. The front wheel and seat post collar are quick release, which makes adjustment and servicing easier but also makes them vulnerable to theft and tampering. Consider a locking seat leash cable and always loop your front wheel with the frame when locking. Mounting a folding lock to the base of the downtube, where those bottle cage bosses are, could be a good thing. And finally, it seems like the bar that Surface 604 specced for this bike offers a bit of rise but is shorter than some (especially the swept-back cruiser bars). And, my guess is that this allows the bike to fit between cars and through doorways more easily. It all works together well and makes for an enjoyable and empowering ride. The shorter reach and comfortable design remind me of a cruiser at times, but it offers the utility, efficiency, and durability of a city bike. Big thanks to Surface 604 for partnering with me on this post and working with the Electric Bicycle Center in Fullerton California for the review. I was impressed by the free shipping and quality packaging on the Rook (when Surface 604 shipped that model directly to me for review). It gave me the full “online order” experience, which is neat to see and hopefully helps relate to actual customers. I welcome your feedback in the comment section below and the Surface 604 forums.


  • You can find this model at some ebike shops in Canada and the USA but Surface 604 also sells direct online for people who live in remote areas, shipping is free and there’s minimal setup (you can see me build the Rook in the video review here)
  • I love how Surface 604 is offering a high-step and step-thru version of this bike (the step-thru is called the Rook) and that the Colt comes in two frame sizes to accommodate different riders
  • The satin black frame and fork hide fingerprints and blend nicely with the black battery casing and black wires… also, most of the shifter cables, brake wires, and electrical wires are internally routed and stay out of the way
  • Good hydraulic brake setup with adjustable-reach levers that are easier to pull (if you have small or sensitive hands) and motor inhibitors that override assist and throttle
  • Pretty decent drivetrain, Shimano Altus is only one step above the Tourney entry-level but you get nine gears here and the derailleur is really tucked in, I especially like the trigger shifters vs. the big thumb shifters on some other value-priced ebikes
  • Adjustable suspension fork (with rebound adjust, compression adjust, and lockout), I like the gel saddle and grips, even though the grips aren’t locking… consider upgrading to something like this if you find that they spin on you
  • Surface 604 uses nicer hardware like sealed headsets and bottom brackets, the integrated lights are a big deal for me too, it seems like many competing products use a non-integrated rear light which requires two AA batteries and more effort to turn on and off, the pedal assist sensor is sealed and measures torque to be more responsive
  • Good weight distribution, the battery is low and center on the frame, this improves handling and frees up the rear rack for cargo
  • I tested the USB Type A port with my iPhone and it worked! Even when the bike is turned off or the battery is disconnected, you can maintain or charge your portable electronic devices (but you might want to use a right-angle USB adapter and zip ties to keep the wires from sticking out and getting snagged)
  • I like how the rear rack is welded onto the frame and that it is color matched, there’s a sturdy deck on top for a trunk bag and the saddle and there’s plenty of room for the seat to come all the way down, you can also hang clip-on panniers on the special narrow rods along both sides, or use bungee cords with the lower loops
  • I like how the branding is subtle and feel that the paint job on these ebikes is a step above some of the competition, they use satin finish which looks more premium and I really appreciate the white option on the Rook step-thru model which is more visible at night
  • The display panel is not removable but does swivel easily and feels pretty tough, I especially like the 10-bar battery infographic vs. just 5-bars on many competing displays
  • Both wheels use thicker spokes for strength, the rear wheel has 12 gauge which helps to secure the powerful hub motor, this bike definitely feels zippy in the highest level of assist and throttle
  • The comfort is already pretty good with the shorter reach, adjustable stem, suspension fork, and gel saddle, but Surface 604 also offers a nice Suntour NCX suspension seat post and shim at a discounted rate of $99 when you buy the bike
  • Surface 604 has been operating since 2013 and I’ve reviewed a bunch of their other ebikes, I feel like their comprehensive year-long warranty is good and they offer solid customer support considering the more affordable pricing, I’ve toured their facility and they stock lots of replacement parts
  • Great attention to detail here, they used a nicer Satori adjustable stem, upgraded Wellgo pedals, and even included bottle cage bosses on the base of the downtube!


  • The tires are kind of basic, they don’t include a special puncture protective liner or have reflective sidewall stripes but at least the chain cover seems to be reflective on the right side, I do appreciate wider size (26″ x 2.1″), for comfort and stability but might replace them with something like this down the line, the 26″ wheel diameter lowers the frame a bit and makes it approachable
  • The plastic fenders and chain cover reduce weight and won’t get bent or rust like aluminum or steel, but they do rattle a bit more. When I was reviewing the 2018 Rook, the front fender arrived a bit warped to the side… so I put some of the foam packing material underneath and it straightened out over a couple of days :)
  • The Bafang hub motor has its power cable run in from the right axle and it’s just a bit vulnerable to snags and bends there, plus it crowds the light cable and shifter cable a bit
  • The trigger throttle power output is limited by the level of assist being used, this means you can’t use it as a quick override to climb easier or go faster… they might have done this as a safety feature since the bike starts in level 1 assist where the throttle is active
  • There’s no slap guard on the right chainstay, but the shifter wire and motor cable are both run along the top and will protect the frame if the chain bounces down, the chainring does not have a guide or bash guard… but that’s probably not a huge deal for a city cruiser bike like this
  • The headlight worked surprisingly well, it has a pretty bright and focused beam that does more than just keep you visible, however, it is mounted to the suspension arch and may bounce up and down on bumpy terrain compared to if it had been mounted to the crown, headset, stem, or handlebar above the moving part of the fork
  • Minor gripe here, it seems like there was room to put a second set of bottle cage bosses on the seat tube, this would definitely be useful for folding locks, mini pumps, and other smaller gear, you could always use an adapter like this to add a mounting point aftermarket


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Comments (8) YouTube Comments

Captain Walnut
4 years ago

Does anyone know if this is a controller that can be overridden for higher top speed, like the Rad bikes?

4 years ago

Hi Captain! I think that they purposefully set it at 20 mph to help the motors last longer (or maybe the battery) but there is a password area in the screen that allows you to change and possibly raise the top speed. You might want to ask around in the Surface 604 forums or ask the company for the password if you get the bike

3 years ago

You really do a great job with the reviews, thanks for the info.

3 years ago

Hey, Jeff! Your comment made my day. Thanks for taking a moment to say hi and share some appreciation. I’m doing my best here ;)

Frank Ryan
3 years ago

Really appreciated this review and am leaning towards a purchase. Only concern is hill climbing . I live in Seattle and there are some steep streets near my home. For that reason I have been considering a mid-drive. Any general input in rear hub motors and hill climbing ability would be mos welcome. Thanks,

3 years ago

Hi Frank, you’re looking at the right things in this decision. Mid-drive will be more efficient in general if you shift gears thoughtfully… and it could climb better too, but geared hub motors are very capable if you go into a hill with some speed and pedal along. They won’t put as much stress on the chain, sprockets, and derailleur and have a more satisfying throttle experience. Mid-drive ebikes tend to cost more, but could be worth it for certain applications. I personally really enjoy hub motor, have you been able to test ride both mid-drive and hub motor? Might be worth visiting an ebike shop or looking at used bikes on Craigslist to experience the differences :)

earl york
3 years ago

I’m having problem with my pedal assist can you give me an idea what might be wrong? I have a surface 604 Colt.

3 years ago

Hi Earl! This may be due to the sensor plate which has little magnets on it. The plate rotates as you pedal and the magnets send a signal to the motor controller to get the motor operating. If that disc gets bumped out of position, it could become inconsistent. Another possibility is that the cables connecting the sensor could be loose. This can happen if the bike tips or if you steer far to one direction and the cables all get stretched. I hope this helps, but you could also make a post and share some photos in the Surface 604 forums to see if anyone has a suggestion :)


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