![]() It is a good setting for level terrain or even mild climbs. At level two the assist is a little more energetic. Basically, it makes up for the Peak being heavier than a pedal bicycle. The Peak has a throttle, but unlike many machines with a throttle (where a no-assist setting allows the throttle to provide assist on demand), the Peak throttle works at any level of assist and elevates the support to the absolute maximum, but only up to 8 mph. ![]() All four levels of assist sense pedaling and add assist automatically. The handlebar control allows you to toggle the assist level between one and four, turn on the display screen, and select information screens. There is a soft-button on switch on the battery case, and you start the system and activate the display with an on button that is part of the handlebar-mounted control unit. The battery case attaches to the frame tube where a bottle cage would normally reside. The brains of the outfit are all tucked in with the drive unit or in the battery case, so there is no external controller. ![]() The idea is the same: mount the assist unit in the middle of the chassis and allow it to use the derailleur and cassette to essentially give the drive unit a nine-speed transmission. The look is somewhat close, but this is not a Bosch drive. Most of the other e-bikes in the Currie Technologies Izip line have hub motors of one sort or another, but the Peak has a Currie-spec, 350-watt, TransX, mid-drive, high-torque assist unit with proprietary software. This is an e-bike tailor-made for climbing, so it is more than aptly named. In this case we were happy to find that the rest of the bike fully deserves an assist package this impressive. When an e-bike is destined to spend its time on pavement, the advantages of a mid drive are not so pronounced, but the Peak is a mountain bike with plenty of dirt in its future, and the benefits in handling off-road make the mid drive a huge deal for a bike that retails for $2999. To find a local dealer, visit, or drop by the official IZIP Store in Venice, Calif.Dedicated mid-drive e-bikes are the absolute latest in production models. In “pedal-assist-system” (PAS) mode, on the other hand, the motor is triggered to output half of its full power when sensors detect that the rider has started pedaling. This bike is lighter than electric bikes of yore and capable of two modes: In what's called “twist-and-go” (TAG) mode, the throttle triggers 100% motor power, which is added to any pedaling. Besides the Express and other models, the IZIP E3 Metro also exists. are less than two miles in distance, but 90% of them are made by car - a trend he hopes to change. Where does the motor get its power? A high-capacity lithium-ion battery pack powers the motor, and sits inside the bike's main triangle-shaped frame.Īs Pizzi points out, 40% of all urban trips in the U.S. Additional sensors cut motor power completely when the rider stops pedaling or hits the brakes. As is common in pedalecs, electric power is only actuated when one pedals. ![]() The electric motor is a brushless (permanent-magnet) four-inch frame motor, proportionally regulated by motor controls. The human-powered drivetrain consists of a classy SRAM Rear Derailleur, PowerGlide 950 11-32T 9-speed Rear Cassette, Shimano Front Derailleur M580-E, and a Shimano triple chain-ring crankset. It combines human power input on the right side of the wheel (through a conventional 27-speed bicycle drivetrain) with the power from a 750-W dc electric motor (on the opposite side of the hub) through a fiber-reinforced pulley - driven by a notched belt from Gates Corp., Denver. This integrated drive is a dual planetary system housed inside the bike's rear-wheel hub. As Larry Pizzi, president of Currie Technologies explains, “Through various phases of development, this hybrid drive has been referred to by many names - Dolphin, Syntelli - but ultimately, we settled on Evo-Drive.” Marketed by Currie Technologies, an Accell Group company, Chatsworth, Calif., one bike called the IZIP Express integrates what's billed as the Evo-Drive. More motor assist can be supplied when tackling longer distances or particularly nasty hills, for example. Cyclists simply pedal like on a normal bike, while getting a proportional boost from an electric motor when desired. At the forefront are pedalec bikes that allow mixing and matching of input as needed. Even the traffic capital of the world, Los Angeles, hasn't been able to resist the fun of electric bicycles - and maybe you won't, either.
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