Cyrusher Rumble Step-Thru Fat Tire E-Bike

Meet Rumble—a comfortable, confidence-inspiring step-thru fat-tire e-bike built to make every ride easy. The low step-thru frame welcomes you aboard, the suspension fork and high-volume 4" tires smooth out chatter, and hydraulic disc brakes keep stopping predictable. A reliable 500W rear hub motor (65 Nm) paired with cadence-based assist delivers smooth power up to 22 mph, while the 48V 18Ah (864 Wh) battery supports up to 80 miles of real-world range. With a 350 lb payload, Rumble is ready for commutes, errands, and weekend path rides—without the intimidation. 

Quick highlights

• Step-thru frame for easy on/off and confidence at every stop. 

• 20×4.0" fat tires + suspension fork = calmer rides on pavement, gravel, and light trails. 

• 500W (65 Nm) hub motor with cadence sensor for smooth, intuitive assist up to 22 mph

• 48V 18Ah / 864 Wh battery for up to 80 miles per charge. 

• Hydraulic disc brakes and 6061 aluminum frame for control and durability. 

• Payload: 350 lb; recommended height: 5'1"–6'2"; bike weight w/ battery: ~70.3 lb.