Surface 604 Yunbike C1 Step-Thru Bike

[LockH]

Mentioned on ES only once before maybe, here:
https://endless-sphere.com/forums/viewtopic.php?f=2&t=85110&p=1245525#p1245525

"Surface 604 Yunbike C1 Step-Thru Urban Electric Commuter Bike, Lightweight Electric Bicycle (Red)" seen also here:
https://www.everafterguide.com/surf...ht-electric-bicycle-red-679ca0df6b9ab9bf.html

Description
The Yunbike C1 is designed and built for the modern city cyclist. The C1 weighs just 35lbs; perfect for carrying in and out of the apartment and heading off to work.Through a built-in smart system that communicates directly with an app on your mobile device, tracking your speed, and other data is easy. The display has a USB port that charges your mobile device as you pedal to your destination. The removable battery includes a USB power bank to charge your devices.Battery placement gives a sleek design and stylish look, as well as providing a built-in rear light. Paired with a powerful front light, the integrated LED system means you're set for riding into the night.SPECIFICATIONSrive System:Yunbike rear hub gearless direct drive 180W+ (peaks at 250W) Torque:30NmBattery:36V 5.2Ah Samsung Lithium Ion, locking and removable Charge Time: 2.5 hours with 2A charger Battery Life:Up to 20mi depending on mode Weight Including Battery:35lbs Battery Weight:2.6lbsFrame:6061 aluminum alloy 17in Fork:Rigid aluminum 11mm Axle with Bolts Crank: 170mm Crank Arms, 44T Chain ring Headset: Custom CNC alloy Pedals:Wellgo Aluminum alloy platform, Cage Type Display Type: Fixed, backlit LCD display with built-in USB port shows speed in km/h, Assist level (1-3), Trip distance and Total distance Drive Mode: Torque sensing pedal assist with integrated gyrometer and a throttle ; single speed 11T Rear Sprocket Top Speed/Range:15.5mph 10-25 mile range Brakes:Formula C1 Mechanical V-Brakes with Formula C1 Levers with Motor Inhibitors Handlebar :Flat, 570mm Grips:Ergonomic rubber with lockers Saddle:Velo, ergonomic Seat post: Aluminum alloy 350mm, diam=31.6mmWheels and Tires:Alloy Double Wall, BMX Brand, 32H Brass Eyelets with 15G F/12G R Stainless Steel Spokes with Red Accent 20 x 1-1/8" Kenda Accessories:chain guard, kickstand, bottle cage and fender bosses, bell, rear rack capable 200 lb Max load Smart system with mobile app to have more control over your trip data Integrated lights, no need for spare batteries; easily maintenance single speed bike with pedal assist. Throttle is only for walk mode not for full speed Light weight stylish city commuter only 35 lbs! Torque control pedal assist for more natural feeling Street legal in most locations (check your local laws) Smart system with mobile app to have more control over your trip data Surface 604.

 

[2old]

These were on display at Interbike. Seem functional, but not for me. They also had a 35 pound carbon mid-drive (AIR) which was priced competitively.

 

[Drunkskunk]

Nice. But, you know, one of the important parts of a step-thru bike is that you can actually, you know, "step" like, "through" the bike. Seriously. That's what those words arranged in that order actually mean.

This is a step-thru :

This is sort of like Volkswagen naming their flagship car the Phaeton. it was a hard top saloon. but a Phaeton is a style of car or carriage that has no roof at all. It's not even a convertible. Yay for marketing totally getting a name's meaning all wrong.

 

[Chalo]

To be fair, a step-through bike is traditionally one that has the top tube low enough that you don't have to swing a leg over/behind the saddle. So the term includes ladies' bikes and mixtes. The bike in your photo is what I'd call a "low step-through", which is a kind of bike I'd sort with other special-needs bikes, like handcycles and side opening trikes.