2015 IZIP E3 Sumo Review

Izip E3 Sumo Electric Bike Review 1
Izip E3 Sumo
Izip E3 Sumo Tranzx Mid Drive Aluminum Bash Guard
Izip E3 Sumo 48 Volt Removable Battery Pack
Izip E3 Sumo Adjustable Display Twist Throttle
Izip E3 Sumo 26 4 Kenda Juggernaut Sport Tires
Izip E3 Sumo 160 Mm Rear Hydraulic Disc Brake
Izip E3 Sumo Locking Velo Grips
Izip E3 Sumo Sram X7 Derailleur 10 Speed
Izip E3 Sumo Velo Race Saddle
Izip E3 Sumo Stock 1
Izip E3 Sumo Stock 2
Izip E3 Sumo Stock 3
Izip E3 Sumo Electric Bike Review 1
Izip E3 Sumo
Izip E3 Sumo Tranzx Mid Drive Aluminum Bash Guard
Izip E3 Sumo 48 Volt Removable Battery Pack
Izip E3 Sumo Adjustable Display Twist Throttle
Izip E3 Sumo 26 4 Kenda Juggernaut Sport Tires
Izip E3 Sumo 160 Mm Rear Hydraulic Disc Brake
Izip E3 Sumo Locking Velo Grips
Izip E3 Sumo Sram X7 Derailleur 10 Speed
Izip E3 Sumo Velo Race Saddle
Izip E3 Sumo Stock 1
Izip E3 Sumo Stock 2
Izip E3 Sumo Stock 3


  • One of the only fat tire style electric bikes I've tested to date that is legally capable of 25+ mph top speeds in pedal assist mode
  • Good value considering the custom fat frame in two sizes, solid warranty and availability, hydraulic disc brakes, 10 speed cassette and refined electronics (locking removable battery, backlit display that swivels, advanced pedal assist sensor)
  • Throttle mode cuts out at 6 mph if you aren't pedaling along (reached 20 mph if you are), no fender, rack or bottle cage bosses

Video Review





E3 Sumo


$3,650 USD

Body Position:


Suggested Use:

Trail, Sand and Snow

Electric Bike Class:

Speed Pedelec (Class 3)
Learn more about Ebike classes


Lifetime Frame, 2 Year Motor, 1 Year Battery


United States

Model Year:


Bicycle Details

Total Weight:

52 lbs (23.58 kg)

Battery Weight:

6.1 lbs (2.76 kg)

Frame Material:

6061 Aluminum Alloy

Frame Sizes:

17 in (43.18 cm)19 in (48.26 cm)

Frame Types:


Frame Colors:

Gray with Fluorescent Green Accents

Frame Fork Details:

Rigid, Aluminum Alloy

Gearing Details:

10 Speed 1x10 SRAM X7, 11-36 Tooth Cassette

Shifter Details:

SRAM X7 Triggers on Right Bar


Lasco Centerdrive 38 Tooth Chainring


Wellgo Aluminum Alloy Platform


VP Semi-Integrated Ahead


Zoom 3D Forged Aluminum Alloy


TranzX ATB Lowrise

Brake Details:

Tektro Dorado Hydraulic Disc with 180 mm Front Rotor and 160 mm Rear Rotor, Tektro Dorado Levers with Motor Inhibitors


Velo Flat Rubber, Locking


Velo Racing

Seat Post:

TranzX Alloy with Microadjust

Seat Post Length:

350 mm

Seat Post Diameter:

31.6 mm


Alex FM-1 Doublewall with Cut Outs


Stainless Steel

Tire Brand:

Kenda Juggernaut Sport (5 to 30 PSI), 26" x 4"

Wheel Sizes:

26 in (66.04cm)

Tube Details:

Presta Valve


Aluminum Bash Guard and Chain Guide, Quick Release Wheels Front and Rear, Padded Slap Guard on Right Chain Stay


Locking Removable Battery Pack, KMC X10eRB High Torque Rust Proof Chain

Electronic Details

Motor Brand:


Motor Type:

Mid-Mounted Geared Motor
Learn more about Ebike motors

Motor Nominal Output:

350 watts

Battery Voltage:

48 volts

Battery Amp Hours:

8.7 ah

Battery Watt Hours:

417.6 wh

Battery Chemistry:


Charge Time:

5 hours

Estimated Min Range:

15 miles (24 km)

Estimated Max Range:

35 miles (56 km)

Display Type:

Backlit Monochrome LCD, Fixed with Adjustable Angle


Speed, Odometer, Battery Capacity, Assist Level (1-4), Range Estimation

Display Accessories:

Independent Button Pad on Left Bar

Drive Mode:

Advanced Pedal Assist, Twist Throttle (Measures Speed, Cadence and Torque)

Top Speed:

28 mph (45 kph)(6 mph Throttle Only, 20 mph Throttle with Pedaling)

Written Review

This is the review for the 2015 E3 Sumo, in 2016 an updated model arrived with sturdy thru-axles, an optional $50 boost mode that acts like a throttle and a slightly altered paint job… it also costs a lot less! Check it out in the full review here.

The E3 Sumo is one of the only fat electric bikes I’ve tested that is capable of performing above 20 mph as a US legal “speed pedalec”. It uses an efficient mid-drive motor system by TranzX for climbing and reaching greater speeds and distances efficiently. While I do have a few basic gripes here including the lack of fender, rack and bottle cage bosses as well as the lack of a kickstand (like many fat tire bikes) and an early cutoff in throttle mode at ~6 mph, overall it’s an excellent ebike at an amazing price under $4k. If you like the fat bike style or plan to do trail, sand and snow riding then this is a capable option. The Kenda Juggernaut tires are 4 inches wide and can take 5 to 30 PSI for navigating soft or hard terrain respectively. I love that the bike is available in two frame sizes even though both are high-step, the top tube is angled slightly and the frame is relatively light weight at ~52 lbs but still sturdy thanks to the triangular “diamond” tube configuration. This ebike is made by Currie Technologies, a company that has been a leader in the US electric bike space since 1997 and offers one of the better warranties (lifetime frame, two year drive systems, one year battery) with a vast newtwork of dealers for testing before you buy.

Driving the bike is a 350 watt geared centerdrive from TranzX. It strikes a balance between the more affordable low-end middrives that rely on cadence sensors only and can feel jerky and the more expensive high-end systems with shift detection and rapid drive cutoff. I tested one of the early versions of this TranzX motor in 2013 and wasn’t entirely impressed however, two years later in 2015 (at the time of this review) I found the motor to be quieter, smoother and generally more responsive. It feels very zippy and torquey in throttle mode going from 0 to ~6 mph and is capable of hitting 20 mph if you pedal along. Basically, the throttle is meant to act as an override in lower levels of assist so you can “boost” up short hills without changing assist levels. For that application it works very well and while I’m not sure what the peak output is from TranzX centerdrives, I’d guess it’s upwards of 500 watts which is excellent when combined with a lower gear. The motor itself is small, well positioned (completely replacing the bottom bracket tubing) and fairly responsive. It turns a 38 tooth chainring that includes an aluminum bash guard on the outer edge and a plastic guide on the inner edge (to reduce drops). The control system on the Sumo is measuring your rear wheel speed, pedal cadence and pedal torque to deliver responsive motor output and it feels good but not quite as quick as the Bosch or Impulse system. It also lacks shift detection which means the sprockets and chain take a bit more abuse if you aren’t proactive in how you shift but the chain is extra strong and rust proof to help reduce abrasion.

Powering the Sumo is a 48 volt 8.7 amp hour battery pack reminiscent of other 2015 IZIP models. It’s well positioned on the downtube, keeping weight low and centered, and has some matching stickers to blend in with the frame a bit. I like that it’s designed to lock to the frame with a key for security but that it can be charged on or off (which also makes the bike lighter for transport). Many newer electric bikes run 48 volt systems because electricity is transferred more efficiently at higher voltage and the motor is also able to reach higher torque and power output. The cells inside are light weight, 18650 sized, energy dense Lithium-ion much like you’d find in an electric car. To help them perform best, I recommend storing in a cool dry environment between uses and maintaining a charge level between 20% and 80% so as not to stress the cells. While the pack itself does take up most of the space in the triangular section of the frame (thereby displacing a bottle cage mount) it’s similar to what I see on other models in this price range. The only downside in my mind is that the pack has to be switched on independently of the main display. So basically, you hold the rubber on/off button on the right side of the battery pack for a few seconds and then press the on/off button on the display panel for a second to get the bike rideable. This extra step is just annoying and can actually be confusing if you forget the extra step and then wonder why the display unit won’t come on.

Once the Sumo electric bike is actually switched on and ready to go, the display panel does a quick eight second countdown. I like how large the LCD readout is and that it’s mounted front and center just above the stem (with two plastic legs for extra strength). this display can swivel forward and back to help reduce glare if it’s sunny out but it’s not removable which means it could take more wear from the sun, rain or fellow pedestrians at bike racks. Near the left grip you’ve got a rubberized control pad with four unique buttons (up, down, display and power). There are four levels of assist in here and the throttle can be used to override any of them at full power (up to 20 mph) at any time if you’re pedaling. To hit that 28 mph top speed you’ll need to be in level four and using one of the higher gears. I found that the TranzX motor spins at a limited range of speeds but offers more power at those speeds and what this means is the lower gears will only go so fast, even in the highest drive mode. This works alright and just requires that you shift through one of the 10 speeds using the trigger shifters near the right grip. There is a zero mode where the throttle and pedal assist are inactive and to get to this you need to hold the display button for a couple of seconds while in assist level one. The display also has built in backlighting which can be activated by holding up for a couple of seconds (there is also a day/night light sensor built into the display for automatic lighting). All things considered, the display and control pad are great for a mid-level ebike like this. They are much improved over the 2014 Currie systems and offer lots of great feedback about your ride including an odometer and range estimator that automatically approximates how far you can go with the remaining battery power depending on which level of assist you’re in.

I feel that the IZIP E3 Sumo has found a sweet spot between performance and value and addressed one of the biggest hurdles that fat e-bikes face which is having enough power to actually move the large wheels through soft terrain. The TranzX drive system has improved significantly in recent years (or maybe I’ve just become more used to it) and while there’s still room for improvement, it definitely gets the job done at above average levels. I like that they went with cut out wheels to reduce weight and add a bit more cushion and that they upgraded the brakes to hydraulic but included motor inhibitors on the brake levers. The upgraded Wellgo pedals are nice and stiff but depending on your foot size the wider Wellgo MG-1 Magnesium Pedals might be worth considering, I like the locking grips and the quick release wheelset is super convenient for transport and maintenance. It’s a solid fat bike that is very capable of off-road riding.


  • Capable of reaching higher top speeds with rigorous pedaling in the highest assist level, one of the only fat electric bikes I’ve tried that is a speed pedelec
  • Excellent weight distribution with the mid-frame battery pack and centerdrive motor, this improves balance and handling, especially on trails or in the sand and snow
  • Mid-drive motor leverages the 10 speed cassette for improved efficiency and range, great for moving the larger wheels and tires here
  • Cut-out rims reduce wheel weight which makes starting and steering easier, they also provide increased cushion because the tube is more flexible than the tires and it can stretch through the cutout holes
  • Throttle adds power dynamically (up to 20 mph) when pedaling, great for overcoming small hills with a little boost when using a lower level of assist, you can completely shut off pedal assist by holding the power button for a couple of seconds while the bike is on and in assist level 1
  • New 2015 display panel can swivel to reduce glare and is attached at two points for improved strength, also backlit for use in dark environments
  • Front and rear quick release wheels makes the bike easier to transport in your car (especially given the larger 26″ x 4″ tires), this also makes fixing flats easier while you’re out on the trail
  • Removable battery reduces overall weight of the bike when transporting on cars racks and makes charging easier if you store the frame in your garage (keep the battery at neutral temperatures and charged after each ride)
  • Available in two sizes for improved fit, both are “diamond” high-step frames which provides greater stiffness and strength than step-thru
  • Nice component upgrades including the SRAM X7 derailleur, locking grips and oversized aluminum alloy pedals
  • Hydraulic disc brakes operate without requiring much effort so you can keep a strong hold on the handlebars and avoid fatigue when braking, they are smooth and provide quick stopping power
  • Remote button pad on left bar is well sealed against water, blends in with the bar and is easy to reach while riding – intuitive menus make operating the bike while riding easy
  • Solid warranty from Currie Technologies, available to see and test ride at many shops across the United States and get serviced ongoing


  • The throttle can only reach ~6 mph if you’re not pedaling along, it cuts out abruptly and leaves me wishing it could hit 20 mph on its own without pedaling along
  • No water bottle cage mounting points, you’ll have to use a Camelbak or get a saddle rail adapter to add a a cage separately, no rear rack mounts (consider a beam rack) or fender mounts and no kickstand
  • Display panel is not removable, when using the bike to commute to work or park in town this exposes it to more wear through weather and possible tampering
  • Value drive system with larger front ring and simpler control sensors than higher end systems like Bosch or Impulse, the motor doesn’t kick in or stop as quickly and it also can’t sense when you’re shifting gears
  • The battery pack has a rubber on/off switch as well as the main control pad so you have to press “on” two times to get the display to activate which takes a bit more energy and time than… not a huge deal, might reduce tampering


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Comments (4) YouTube Comments

Jim Bothwell
7 years ago

Hi Court, I love your impartial reviews and am grateful for your mindful efforts! I have a question on the specs above: On Currie’s specs for the 2015 Sumo, they list the motor as “Currie Electro-Drive® Centerdrive,” but this review says it’s a TranzX. Is TranzX a Currie-brand motor, or did they switch at some point?

Court Rye
7 years ago

Hi Jim! Great question and thanks for your compliments. I believe the motor is made by TranzX but rebranded and presented as “Currie Electro-Drive” as part of their system which includes display, battery and motor. If you look at the images above, the second photo shows a closeup of the motor and you can see that molded into the plastic is the “TranzX” name. Currie Izip mid drive ebikes mostly all use this same motor from TranzX but now they also have one from Simano that’s part of the STEPS system on the Raleigh Misceo. Raleigh is owned by Accell Group just like IZIP.

James Reed
3 years ago

I have a 2015 Sumo and love it. I want to upgrade to a Rohloff 14 speed hub but wanted to make sure this hub is 190mm wide. Can you tell me if it is.

3 years ago

Hey James! That sounds cool. No, unfortunately I do not have details on the Rohloff 14 speedhub but maybe a shop like Propel Bikes would. I know that Chris carries a bunch of products that come with Rohloff pre-installed. I hope this helps point you in the right direction and that he could help, or maybe someone here in the comments or the EBR forum parts section would know :)


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