Gotrax · Folding
Gotrax Z4 Pro: real range, hills and charging
A 180 lb rider on the Gotrax Z4 Pro at 16 mph with relaxed pedaling over rolling hills (±2%) on pavement can expect about 29 miles per charge (23–34 mi), using 15.1 Wh per mile. The brand claims up to 50 miles. That is about 57% of the claim. On throttle only over hills it drops to about 19 miles.
$1,299
480
Wh battery
500
W motor
28
mph max
Price checked 2026-10-20. We may earn a commission.
How far does the Gotrax Z4 Pro go for your weight?
Miles per full charge on a new battery at 70°F on pavement, no wind. Each number is the middle of a ±20% band. Gotrax claims up to 50 miles (no conditions stated).
| Rider weight | Easy 12 mph | Everyday 16 mph | Fast 20 mph | Throttle, hills |
|---|---|---|---|---|
| 150 lb | 46 mi (37–56) | 30 mi (24–36) | 21 mi (17–25) | 21 mi (17–26) |
| 200 lb | 41 mi (32–49) | 28 mi (22–33) | 20 mi (16–24) | 18 mi (15–22) |
| 250 lb | 36 mi (29–43) | 25 mi (20–29) | 19 mi (15–23) | 16 mi (13–19) |
| 300 lbover max load | 32 mi (26–39) | 22 mi (18–26) | 18 mi (14–21) | 14 mi (11–17) |
- Easy 12 mph: 12 mph, relaxed pedaling, flat
- Everyday 16 mph: 16 mph, relaxed pedaling, rolling hills
- Fast 20 mph: 20 mph, relaxed pedaling, rolling hills
- Throttle, hills: 15 mph, no pedaling, hilly
Can the Gotrax Z4 Pro climb hills?
Highest steady speed on each grade, motor at an estimated 800 W peak. A 10% grade is a steep city street; 15% is a hard hill.
| Rider | 5% grade | 10% grade | 15% grade |
|---|---|---|---|
| 180 lb, throttle | 16 mph | 9 mph | 7 mph |
| 180 lb, pedaling | 18 mph | 11 mph | 8 mph |
| 250 lb, throttle | 14 mph | 8 mph | 5 mph |
| 250 lb, pedaling | 15 mph | 9 mph | 6 mph |
Steepest grade at 8 mph (180 lb): 12% on throttle, 14% with moderate pedaling. Peak power lasts for short hills; on long climbs motors fall back toward their 500 W nominal rating.
Charging time and cost
Empty to full (2 A)
4 h 44 min
With a 5 A charger
2 h 30 min
Cost per full charge
$0.10
Cost per mile
0.33¢
US average residential electricity, 18.31¢/kWh (EIA, July 2026), 85% charger efficiency. Charge time: constant current to ~85%, then about an hour of top-off.
Range in cold weather
70°F
29
mi · 100% cap.
50°F
26
mi · 94% cap.
32°F
23
mi · 85% cap.
20°F
20
mi · 75% cap.
Everyday scenario, 180 lb rider. Capacity loss is temporary; store and charge the battery indoors and never charge it below freezing.
Simulate your own ride on the Z4 Pro
Gotrax Z4 Pro specs
From the Gotrax product page, checked 2026-10-20. est. marks values Gotrax doesn't confirm.
- Price
- $899 (list $1,299)
- Class
- Class Not stated, throttle est.
Source note
28 mph with twist throttle; no class stated
- Top assisted speed
- 28 mph
Source note
Product page says 28 mph; Gotrax's EBE4 (same bike) manual says 20 mph
- Battery
- 480 Wh (48 V × 10 Ah), removable est.
Source note
Product page gives only '48V'. 48V 10Ah from the EBE4 manual on Gotrax's store CDN; Gotrax sells one battery for 'Z4 Pro & EBE4' cdn.shopify.com
- Motor
- 500 W nominal, rear hub
Source note
Gotrax says '500W Avg'
- Torque
- Not published est.
Source note
Not stated
- Pedal sensor
- Torque and cadence
- Claimed range
- Up to 50 mi (No conditions stated)
- Weight
- 66 lb with battery
- Max load
- 265 lb rider + cargo
Source note
Total weight limit
- Wheels & tires
- 20" × 4"
- Frame
- 6061 aluminum folding fat tire, front suspension
- Charger
- 2 A
- Safety certification
- UL 2849 ('in accordance with')
Replaces or follows: Gotrax EBE4.
Common questions
What is the weight limit of the Gotrax Z4 Pro?
Gotrax rates the Z4 Pro for 265 lb total (rider plus cargo). At 250 lb it still goes about 25 miles in everyday riding.
Can the Gotrax Z4 Pro climb steep hills?
On throttle alone, with a 180 lb rider, it can hold 8 mph up a grade of about 12% (our estimate from its 800 W estimated peak power). With moderate pedaling, about 14%. On a 10% hill it holds about 9 mph on throttle.
How long does the Gotrax Z4 Pro take to charge?
About 4 h 44 min from empty with the 2 A charger, or about 2 h 30 min with a 5 A fast charger. A full charge costs about $0.10 at the US average of 18.31¢/kWh, or 0.33¢ per mile.
Is the Gotrax Z4 Pro a Class 2 or Class 3 e-bike?
Gotrax lists it as Class Not stated, with a top assisted speed of 28 mph and a throttle. Class 3 speeds (up to 28 mph) are limited to pedal assist; on throttle, Class 2 rules cap it at 20 mph.
Which hitch racks fit the Z4 Pro?
At 66 lb with battery (about 61 lb without it) and 4" tires, 12 of 23 hitch racks we track can carry it.
| Kuat Piston ION 2-bike | 100 lb/bike | Fits |
| 1UP USA Super Duty Double | 100 lb/bike | Fits |
| Saris MHS 2 Bike Package | 100 lb/bike | Fits |
| Aventon Hitch Rack Pro | 85 lb/bike | Fits |
| Yakima OnRamp LX | 80 lb/bike | Fits |
| Hollywood Racks Sport Rider for Electric Bikes | 80 lb/bike | Fits |
| Hollywood Racks RV Rider E-Bike Rack | 80 lb/bike | Fits |
| Aventon Hitch Rack | 77 lb/bike | Fits |
| Yakima StageTwo | 70 lb/bike | Fits |
| Hollywood Racks Destination E | 70 lb/bike | Fits |
| Allen Sports High Capacity Locking Premier for Electric Bikes | 70 lb/bike | Fits |
| Kuat Piston Pro X 2-bike | 67 lb/bike | Fits |
Doesn't fit: Thule Epos 2-bike (tires too wide), Yakima OnRamp (tires too wide), Thule EasyFold XT 2 (tires too wide), 1UP USA Heavy Duty Double (tires too wide), Thule T2 Pro XTR 2-bike (too heavy), Kuat NV 2.0 2-bike (too heavy), Kuat NV Base 2.0 2-bike (too heavy), Saris Door County 2-Bike Motorized (tires too wide), Saris SuperClamp G4 2-Bike (too heavy), Hollywood Racks Sport Rider SE2 (tires too wide), Saris Freedom G2 2-Bike (tires too wide).
All hitch racks →
