Torque sensors and power controls were developed in the late 1990s. For example, Takada Yutky of Japan filed a patent in 1997 for such a device. In 1992 Vector Services Limited offered and sold an e-bike dubbed Zike.[9] The bicycle included NiCd batteries that were built into a frame member and included an 850 g permanent-magnet motor. Despite the Zike, in 1992 hardly any commercial e-bikes were available.
{"id":1475552477250,"title":"SONDORS Fold Z (NOVEMBER SHIPPING)","handle":"sondors-fold-z-shipping-nov18","description":"","published_at":"2018-01-22T06:00:00-08:00","created_at":"2018-07-27T11:25:47-07:00","vendor":"SONDORS Electric Bikes","type":"Electric Bike","tags":["Battery","bike","folding bike","gear","ion","lithium","motor","shimano","sondors","SONDORS Fold","sondors folding bike","tire"],"price":84900,"price_min":84900,"price_max":84900,"available":true,"price_varies":false,"compare_at_price":null,"compare_at_price_min":0,"compare_at_price_max":0,"compare_at_price_varies":false,"variants":[{"id":12819685474370,"title":"Flame","option1":"Flame","option2":null,"option3":null,"sku":"183","requires_shipping":true,"taxable":true,"featured_image":{"id":3973527928898,"product_id":1475552477250,"position":2,"created_at":"2018-08-02T12:43:13-07:00","updated_at":"2018-08-06T05:24:32-07:00","alt":"SONDORS Fold Z (NOVEMBER SHIPPING) - SONDORS Electric Bikes","width":1024,"height":660,"src":"https:\/\/\/s\/files\/1\/1439\/6088\/products\/Fold_Z_Flame.jpg?v=1533558272","variant_ids":[12819685474370]},"available":true,"name":"SONDORS Fold Z (NOVEMBER SHIPPING) - Flame","public_title":"Flame","options":["Flame"],"price":84900,"weight":136078,"compare_at_price":null,"inventory_quantity":9,"inventory_management":"shopify","inventory_policy":"deny","barcode":""},{"id":12819685507138,"title":"Black","option1":"Black","option2":null,"option3":null,"sku":"180","requires_shipping":true,"taxable":true,"featured_image":{"id":3973527961666,"product_id":1475552477250,"position":3,"created_at":"2018-08-02T12:43:14-07:00","updated_at":"2018-08-06T05:24:32-07:00","alt":"SONDORS Fold Z (NOVEMBER SHIPPING) - SONDORS Electric Bikes","width":1024,"height":660,"src":"https:\/\/\/s\/files\/1\/1439\/6088\/products\/Fold_Z_Black.jpg?v=1533558272","variant_ids":[12819685507138]},"available":true,"name":"SONDORS Fold Z (NOVEMBER SHIPPING) - Black","public_title":"Black","options":["Black"],"price":84900,"weight":136078,"compare_at_price":null,"inventory_quantity":5,"inventory_management":"shopify","inventory_policy":"deny","barcode":""},{"id":12819685539906,"title":"Pistol","option1":"Pistol","option2":null,"option3":null,"sku":"181","requires_shipping":true,"taxable":true,"featured_image":{"id":3973527896130,"product_id":1475552477250,"position":1,"created_at":"2018-08-02T12:43:12-07:00","updated_at":"2018-08-06T05:24:32-07:00","alt":"SONDORS Fold Z (NOVEMBER SHIPPING) - SONDORS Electric Bikes","width":1024,"height":660,"src":"https:\/\/\/s\/files\/1\/1439\/6088\/products\/Fold_Z_Pistol.jpg?v=1533558272","variant_ids":[12819685539906]},"available":true,"name":"SONDORS Fold Z (NOVEMBER SHIPPING) - Pistol","public_title":"Pistol","options":["Pistol"],"price":84900,"weight":136078,"compare_at_price":null,"inventory_quantity":10,"inventory_management":"shopify","inventory_policy":"deny","barcode":""}],"images":["\/\/\/s\/files\/1\/1439\/6088\/products\/Fold_Z_Pistol.jpg?v=1533558272","\/\/\/s\/files\/1\/1439\/6088\/products\/Fold_Z_Flame.jpg?v=1533558272","\/\/\/s\/files\/1\/1439\/6088\/products\/Fold_Z_Black.jpg?v=1533558272"],"featured_image":"\/\/\/s\/files\/1\/1439\/6088\/products\/Fold_Z_Pistol.jpg?v=1533558272","options":["Color"],"content":""}
But this bike isn’t just about the accessories. The powerful 48V 13Ah battery will allow you to pedal for longer, with some riders getting over 100 miles from one charge. The bike can be ridden as pedal-assist or throttle only and it’s equipped with full suspension and puncture-free Kenda tires. It folds up neatly to fit into the boot of a car or for commuting, though at 57 pounds, it’s heavy to cart around. A great value-for-money commuting bike with lots of features.
Because they’re electrically powered, e-bikes sit in a bit of a gray area between bicycles and motorcycles. While some states have enacted specific legislation to state where electric bikes can and can’t be ridden, in other states outdated laws mean they’re regulated as a moped or motor vehicle which can cause confusion over registration requirements, access to cycling infrastructure and how old you have to be before you can ride one.
Out on the road the Soho is easy to fire up, just press the button hidden under the top tube (a nice discreet touch), you’ll then get a set of five top-tube mounted LED’s light up to give you a charge indication. First impressions were that the engagement of the motor is a little jerky in tight traffic (tested in central London) and you could find yourself pulled toward the cars you’re weaving though at slow speeds - unless you’re feathering the brakes.
The other thing to consider is that this is a Kickstarter project, so you aren’t directly purchasing from the company, but rather “backing the project” in exchange for a bike. Technically, Stark Drive, or any Kickstarter creator, could cut and run with the money, leaving their backers without legal recourse. In this case though, Stark Drive has already run a successful crowdfunding campaign for their previous bike and demonstrated their ability to deliver, so this is probably at least somewhat safer than a brand new Kickstarter start-up.

This bike impressed me right when I saw it. I love that Haibike offers spec-heavy options with the Yamaha PW system. I think the PW system gets a bad rep sometimes for being less powerful than the Bosch, but to be totally honest not everybody needs the power of a Bosch system. Haibike makes up for the lower torque of the PW system by offering a premium Shimano Deore XT drivetrain with 20 speeds. This is great for riders who want to stay in the action a bit more, but still not arrive sweaty and out of breath.

All Kalkhoff bikes come with lots of extras: hub or motor powered front and rear lights, bells, fenders, chain guards and racks. Some include a built-in quick-lock or a rack-mounted pump. There are a number of features available for the discerning cyclist, whether it's the Magura hydraulic brakes, the B&M super-bright hub-powered headlight, the top-of-the-line Shimano internal hub or derailleurs or the three-layer powder-coated paint process.
The body is made from light and durable aluminum. The handlebar comes with simple controls to let you accelerate, brake, monitor battery life, operate headlights and of course…sound the horn. There’s even an USB point that will let you charge your iPhone or Android on the go. The bike can reach a top speed of 10mph. Feel the wind in your hair as you zoom up and down hills and past all that city traffic…

For many bikes, battery range is more important that total power (because they're all pretty powerful). You want a bike that delivers a range long enough for your rides at the power levels you want. Most e-bikes will have three to five levels of assist kicking in anywhere from 25 percent of you pedal power to 200 percent boost. Consider how fast the battery takes to recharge, especially if you'll be using your bike for long commutes.