YYB-5 Fat Electric Bike

YYB-5 fat Electric BikeYYB-5 fat Electric Bike

YYB-5 Fat Electric Bike

Electric systemMain component
Model NO.YYB-5Frame26 inch Aluminum alloy
Motor250W/350W/500W Rear motorTyres26*4.0
Battery36v/10.4ah lithium batteryRimAlloy double wall
PasSpeed sensorFront ForkAlloy suspension fork
ControllerIntelligent controllerFront brakeDisc brake
ThrottleOptionalRear BrakeDisc brake
DisplayLCDSpokesStainless steel
PerformanceSpeed GearsShimano 6/7 speed
Speed25km/h-32km/h (16 mph -20 mph )DerailleurShimano
Range35-45km (22 miles – 28 miles)Handle BarAlloy
Max Load120kgs (264 lbs)Seat postAlloy
Weight29kg/33kg (64lbs – 73lbs)StemAlloy
Carton size150*34*81CMBrake LevelF&R disc brake
Loading Qty92pcs/20ft,210pcs/40HQChainAntirust
Delivery45-60 DaysChain wheelAlloy



  • Upgraded Kenda Juggernaut tires that feel good on pavement, dirt, sand and snow, removable battery is convenient to charge and has a USB port on the side mostly out of the way for portable electronics
  • More active saddle and bar setup, the reach was a bit longer which might suit taller riders, integrated headlight is convenient on cloudy days for winter riding or at night, trigger throttle design doesn’t compromise grip
  • Only available in one color scheme and one frame size, basic Shimano Tourney 7 speed drivetrain, average mechanical disc brakes, the battery rattled a bit on my unit, suspension is fork is entry level


  • The motor is fairly quiet but feels zippy and had no problem with the soft sand or hills we tested it on, when the air pressure was lowered in the tires to ~7 PSI the bike worked great, the 8Fun motor seemed to be fat-bike specific and extra wide to support the spoke pattern of the wheels, it looked nice
  • The battery can be charged on or off the bike, has an integrated USB charging port (though it’s a bit exposed on the right side) and you only need to push one button to get the bike powered on, not two! Also, keys don’t have to be left in when riding
  • Pedal assist relies on a 12 magnet sensor, that’s the highest number I see on other bikes and it leads to faster on/off activation, I also love that the brake levers override all power modes and cut the motor when pulled
  • It’s neat that you can override assist at any time with the trigger throttle with full power output! Note however that assist is always active, there is not throttle-only mode on the bike
  • I love that this bike offers nine levels of pedal assist because the increments are finder and differences are more subtle… you can find the perfect level for your terrain, range and ride style
  • I love that Kocass sells a matching fender and rack set for just $100, it can be difficult to find the correct size of accessories when dealing with unique frames like those of fat tire bicycles
  • Thumb throttles work great for off-road riding because they don’t compromise your grip on the handle bar, I hear some people say that they are also easier to actuate and can be adjusted up or down to sit wherever your thumb feels most comfortable
  • The punched out rims are cool looking, reduce weight and might offer a little bit more comfort and cushion than solid ones, the red liners show through and match the paint accents on the frame
  • I like that the battery is seated into the downtube and doesn’t stick up very far, it leaves a bit more room for hanging the bike on some racks, lifting it and possibly adding a tight fitting bottle cage adapter to the seat tube like this
  • I appreciate having a kickstand and love that this one is adjustable and mounted far enough back on the left chain stay that it doesn’t collide with the crank and pedal if you are backing up (the crank automatically turns)
  • The Kenda Juggernaut pro tires are high quality… light but durable and with a good off-road tread pattern that’s still fairly dense for use on hard surfaces
  • Quality battery cells from Sanyo, a generous one year comprehensive warranty and flat rate shipping to the US and Canada for just $70 (cheaper than almost all other bikes I see being sold online)
  • I like that the top tube slopes down, lowering stand over height to accommodate people with shorter inseams, I feel like it could slant more but Kocass also has the Mariner folding fat bike for people who really need a lower stand over or just don’t like the big frames


YYB-5 fat Electric Bike YYB-5 fat Electric Bike YYB-5 fat Electric Bike YYB-5 fat Electric Bike

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