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). 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. Powering the Sumo is a 48 volt 8.7 amp hour battery pack reminiscent of other 2015 IZIP models. 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. 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 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 motor itself is small, well positioned (completely replacing the bottom bracket tubing) and fairly responsive. 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. 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. 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. 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 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. 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.ĭriving the bike is a 350 watt geared centerdrive from TranzX. 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. The Kenda Juggernaut tires are 4 inches wide and can take 5 to 30 PSI for navigating soft or hard terrain respectively. If you like the fat bike style or plan to do trail, sand and snow riding then this is a capable option. 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. It uses an efficient mid-drive motor system by TranzX for climbing and reaching greater speeds and distances efficiently. 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”.
IZIP E3 DASH BOOST BUTTON FULL
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.
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