![]() The only downside here is if you set the plug down and forget it. It seats firmly and has several rows of ridges to keep water and debris out of the charging socket. Charging the battery whilst on the bike requires the removal of a large rubber plug… which I love. Rated at 4 Amps, it fills the battery faster than many other electric bike chargers which are only rated at 2 Amps. 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. The battery case is thoughtfully designed with a handle loop at the top and an LED charge level indicator on the left. The battery interface remained the same from the Powerpack 400 to the 500 so you could always get one of the larger batteries later if you wanted. Of course, those packs cost a bit more and the IZIP E3 Sumo is impressively priced at just over $3k. I say standard because Bosch now has a 500 watt hour pack that would take you further and be welcome for the rigors of soft surface riding with lower tire pressure or long steady climbs. Powering the bike is a standard Bosch Powerpack 400 rated at 36 volts and 11 amp hours. Again, I’m extrapolating here but the ample rack bosses suggest that this ebike is meant to carry a load. That sucks if you want to go bikepacking and are trying to put gear onto racks without having the already heavy 53 lb bike tip over. One thing it does not have is a kickstand or mounting bracket to add one. 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. 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. 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. 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. 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. The frame on this thing is purpose built with internal cable routing and a custom battery motor interface. ![]() In the future, if this does present itself as an issue, maybe a lower guide will be added to the bike? Depending on the type of terrain you intend to explore, I’d approach with these considerations in mind and possibly bring a cleaning tool. 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. 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. ![]() 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. ![]() On some other Bosch powered ebikes that have rear suspension, pulley wheels and chain guides have been added to reduce chain slap, slip and kickback. 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. The chainring is much smaller than you’d normally see and is rotated at roughly 2.5x your pedal cadence making it very responsive. 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. This thing offers 75 Newton meters of peak torque output, shift-sensing and shift recommendation, as well as a compact design. Instead of using the mid-tier TranzX motor system, IZIP has opted for the top-tier Bosch Performance Line CX motor system. Lightweight Alloy, SoCal relaxed geometry and styleįormed Aluminum Alloy with oversize steerer and blades.The 2017 IZIP E3 Sumo is a complete upgrade from prior year models. It’s an e-bike that ascends the hills and comfortably covers the distance from beach side to town center and everywhere in between. The Bosch Active Line mid-drive motor and downtube-mounted battery pack provide a low center of gravity for enhanced stability. Pedal away with supreme confidence thanks to the laid-back frame geometry. An elevated version of the Zuma, the Zuma Luxe model encompasses sophisticated styling and stunning looks inspired by the SoCal, sun-worshipping lifestyle found at world-famous Zuma Beach. ![]()
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