
The Cyrusher Zenith is a step over fat tire e-bike for trails and the city: a 52V 750W rear hub motor with 95 N.m, a sensor you can switch between torque and cadence, and a 52V 15Ah battery of LG 21700 cells, 780Wh, sealed inside the down tube. Cyrusher rates it at 28 MPH and up to 60 miles.
A coil spring suspension fork with a lockout carries the front over gravel, sand and broken pavement on 26 x 4 fat tires. Logan hydraulic disc brakes on 180mm rotors stop it and a Shimano 7 speed covers the climbs. It weighs 75.6 lb with the battery and carries 350 lb.
One size fits riders 5'1" to 6'4" over a 30 inch standover. Want the same bike with a frame you step through? That is the Aura.
Built to be lived with
An aluminium step over frame with the battery inside, a coil spring fork with lockout, Logan hydraulic disc brakes on 180mm rotors, a Shimano 1x7 drivetrain and 26 x 4 fat tires on a 26 inch wheelset.
A mid mounted colour LCD, headlight, brake light and kickstand all come on the bike, with a toolkit box and keys in the box. The electrical system is UL 2849 and UL 2271 certified. Frame, motor and controller are covered for two years, battery and parts for one.
The Zenith is the step over version of the Aura: a classic diamond frame in aluminium with the 52V battery sealed inside the down tube, so the frame stays stiff when you stand on the pedals. It is a hardtail. A coil spring fork with a lockout for pavement handles the front, and 26 x 4 fat tires do the rest over gravel, sand and broken road.
Standover is 30 inches and the saddle sets from 32.3 to 40.4 inches. Cyrusher fits one size to riders from 5'1" to 6'4" and rates the bike to carry 350 lb. At 75.6 lb with the battery it is the lightest fat tire Cyrusher we sell.

The rear hub is a 52V 750W brushless motor with 95 N.m of torque. Most e-bikes give you one kind of sensor. The Zenith gives you both: torque mode reads how hard you press and adds power in proportion, cadence mode adds a set amount as soon as the pedals turn. You switch between them on the display.
Five assist levels top out at 28 MPH. The 52V 15Ah battery uses LG 21700 cells, charges in 7 to 8 hours on the 2A charger and comes out of the frame to charge indoors. Cyrusher sells the Zenith as Class 2 or 3, so where you can ride at the top end depends on your local rules.


52V 750W brushless hub with 95 N.m driving a Shimano 7 speed, in torque or cadence mode at the touch of a button.

A bright, waterproof, anti glare headlight on the fork crown, so you see the path and get seen.

A coil spring fork with a lockout for pavement, over a 26 x 4 fat tire that soaks up the rest.

Logan two piston hydraulic discs on 180mm rotors front and rear, with levers that cut the motor.

52V 15Ah of LG 21700 cells, 780Wh, sealed in the down tube and removable to charge off the bike. 7 to 8 hours on the 2A charger.

A rear light that comes on when you brake, so drivers behind know you are slowing.
| Motor | 52V 750W brushless rear hub, 95 N.m |
|---|---|
| Battery | 52V 15Ah, 780Wh, LG 21700 cells, inside the frame; 9.9 lb |
| Range | Up to 60 miles, Cyrusher estimate |
| Top speed | 28 MPH in pedal assist level 5; Class 2 or 3 by Cyrusher |
| Sensor | Torque and cadence, switchable |
| Display | Mid mounted colour LCD |
| Lights | Headlight, rear brake light |
| Charger | 2A, 7 to 8 hours |
| Water resistance | IPX5, some parts IPX7, by Cyrusher |
| Frame | Aluminium step over with internal battery |
| Rider height | 5'1" to 6'4" |
| Standover height | 30 in |
| Reach | 18.5 in |
| Head tube | 5.5 in, 68.5 degrees |
| Saddle height | 32.3 to 40.4 in |
| Handlebar width | 27.6 in |
| Wheelbase | 47.6 in |
| Overall length | 76.4 in |
| Front suspension | Coil spring fork with lockout |
| Rear suspension | None, hardtail |
| Brakes | Logan hydraulic disc, 2 piston, 180mm rotors, front and rear |
| Drivetrain | Shimano 1x7, TY500 derailleur |
| Tires | 26 x 4 fat, on a 26 in wheelset |
| Payload | 350 lb |
| Weight | 75.6 lb with battery, by Cyrusher |
| Colours | Green, Silver, Grey |
| Certification | UL 2849 and UL 2271, SGS certified |
| Warranty | 2 years frame, motor and controller; 1 year battery and parts, by Cyrusher |
| In the box | Bike, charger, toolkit box, keys, user manual |
| Not included | Fenders and rear rack, sold as a set by Cyrusher |
Cyrusher quotes up to 60 miles from the 52V 15Ah, 780Wh battery, and that is a best case pedal assist figure. Rider weight, hills, headwind, cold, tire pressure and how much throttle you use all bring it down. Cadence mode at a high assist level uses more than torque mode does.
Cyrusher lists the Zenith as Class 2 or 3, with 28 MPH reached in pedal assist level 5. In most US states that is legal on roads and many bike lanes, but paths and trails set their own limits. Check your state and local rules, especially where Class 3 bikes are kept off multi use paths.
Same motor, battery, fork, brakes and tires in two frames. The Zenith is the step over, with a 30 inch standover and a saddle from 32.3 to 40.4 inches, for riders 5'1" to 6'4". The Aura steps through for riders who want to get on without swinging a leg over.
A torque sensor reads how hard you press and adds power in proportion, so the bike feels natural and uses less battery. A cadence sensor adds a set amount of power as soon as the pedals turn, which feels more like a throttle. The Zenith has both and you switch between them on the display.
Cyrusher ships the bike, the charger, a toolkit box, the keys and the user manual, and posts an assembly video. You fit the front wheel, handlebar, pedals and saddle, then check every bolt. Fenders and a rear rack are sold separately as a set.
Cyrusher covers the frame, motor and controller for two years and the battery and other parts for one year against manufacturing defects, for the original owner, one replacement per part. Crashes, stunt riding, water damage, modifications and normal wear are excluded. We are an authorized dealer, so it applies.
Six quick questions so the Garage knows how you ride. Then spin the wheel for your code.

