New Medium IZIP E3 Sumo Diamond Frame Electric Bike Bosch Motor
- Item condition:
- Time left:
- $2,999.00 Buy It Now
- Item location:
- Park City,UT,USA
- Ships to:
- E3 SUMO
- 20 mph
- Frame Size:
- 17 in
- Army Green
- Does Not Apply
The 2017 IZIP E3 Sumo is a complete upgrade from prior year models. Instead of using the mid-tier TranzX motor system, IZIP has opted for the top-tier Bosch Performance Line CX motor system. This thing offers 75 Newton meters of peak torque output, shift-sensing and shift recommendation, as well as a compact design. Electric bike shops that I visit regularly praise Bosch motors as being the most reliable… but they do produce a bit more noise than Brose due to higher RPM operation. The chainring is much smaller than you’d normally see and is rotated at roughly 2.5x your pedal cadence making it very responsive. In short, the motor generates a lot of power but whines a bit at high speed and can be vulnerable to chain suck if coated with mud. On some other Bosch powered ebikesthat have rear suspension, pulley wheels and chain guides have been added to reduce chain slap, slip and kickback. The E3 Sumo does not have any of this additional hardware because it has a solid rear end but the chain suck thing could still be an issue. Notice how close the yolk and right chainstay are to the chain when riding in high gears… I saw the chain possibly bouncing into the joint where the yolk meets the stay in the video I shot and this gave me pause. Given the smaller chainring, narrow-wide teeth (that grip the chain) and tight chainring guard, would chain suck be an issue? I’m only theorizing here but it is an issue that has been brought up in the EBR forums before and fat bikes are designed for snow, sand and muddy riding. Depending on the type of terrain you intend to explore, I’d approach with these considerations in mind and possibly bring a cleaning tool. In the future, if this does present itself as an issue, maybe a lower guide will be added to the bike?
The frame on this thing is purpose built with internal cable routing and a custom battery motor interface. In order to fit a standard Bosch motor and align the chain properly, the motor has been seated to the right edge of the bottom bracket mount and a spacer has been added to the left crank arm. It has an alloy skid plate below but is otherwise much more compact than Bosh systems from a year or two ago which had bulky plastic covers and were mounted flat vs. at an angle. It’s an impressive design to be sure and the paint job looks great with digital camo stickers on the frame and battery and accents on the saddle. With two sizes to choose from, this bike becomes much more accessible and gives you the option of riding a bit small to bring in reach and make handling quicker. I love how steep the top tube is because this makes mounting and stabilizing the bike easier which is a huge deal if you’ve added racks and lots of gear.
Powering the bike is a Bosch Powerpack 400 rated at 36 volts and 11 amp hours. The battery case is thoughtfully designed with a handle loop at the top and an LED charge level indicator on the left. You can charge it on or off the bike and the charger is relatively lightweight at ~1.7 lbs and compact enough to toss into a bag. Rated at 4 Amps, it fills the battery faster than many other electric bike chargers which are only rated at 2 Amps. Charging the battery whilst on the bike requires the removal of a large rubber plug… which I love. It seats firmly and has several rows of ridges to keep water and debris out of the charging socket. Most of the other charge port covers on Bosch ebikes have a thinner rubber cover which do have attachments. It doesn’t get in the way and keeps the cover from getting lost… but those covers don’t always seat as well.
Operating the bike is intuitive and fast. Once the battery is charged and mounted you just press the power button near the lower left corner of the LCD display panel. This display is large, making it easy to read, and faintly backlit so it can be used at night. Unfortunately, you can’t turn the backlight off, it’s always there and in some ways that’s distracting. The bike doesn’t come with lights but some shops can wire them in and then you can use the Intuvia display panel to turn them on and off… Running lights off the main battery is favorable to charging and mounting them separately in my opinion but you could also charge a clip-on light with the Micro-USB port built into the right edge of the display panel. It feels like this display does everything. You can tilt it forward and back to reduce glare, remove it completely to keep it safe and deter tampering and you can even replace the display with the COBI system which uses your smartphone and offers even more features like GPS. Navigating the stock display is easy once it has been powered on. You can press the up or down key on the remote button pad which is mounted within reach of the left grip. Being able to add or reduce power while riding without taking your hands off is a great thing, especially for off-road riding. There are four levels of assist and the highest one will easily accelerate the bike to the top speed of 20 mph when on flat smooth surfaces. And while you only get five ticks to estimate charge level on the battery and display panel, there is another menu called range which dynamically estimates how far you can go and interprets it based on battery level, assist level and the last three miles of acutal ride performance. You can access this and other menus like average speed, max speed, clock and odometer by pressing the i button on the display or button pad.
The motor, battery and display panel on this electric bicycle aren’t as seamless and hidden as some others… partially because of their color and partially because they are larger and tacked on vs. built into the frame. But, they are a vast improvement over earlier designs and in many ways match the black tires, handlebar, and seat. Aside from the chain suck concerns I raised earlier, I feel like this is a really great bike. The price is impressive, the weight distribution is perfect and you’re getting high-quality braking and pedaling systems from leading brands. IZIP now sells online through their official website and fulfills using a mobile bike service called Beeline but it’s preferable to test ride in shops, especially to compare sizes, and they do have a solid network of dealers in the USA. I could see myself and friends riding these on long daytrips and possibly camping. It has the capacity to work with racks but does not include them stock like the Felt Outfitter. Hopefully, seeing that bike will give you some idea of what the Sumo could be with a little customization… The $2k price difference gives you a lot of wiggle room for customizing the bike and I think the Sumo has a much nicer motor and battery integration (though it is much newer). Apparently Felt used Old Man Mountain racks for their bike. Lots to consider, it’s a cool platform to say the least and I’m excited to see what people do with it. Big thanks to IZIP for partnering with me on this review and inviting me out to their headquarts in Simi Valley California to do some riding.
MOTOR BRAND:Bosch Performance Line CX
MOTOR TYPE:Mid-Mounted Geared Motor
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