G4 Ultra Safety Features: Temperature Protection, Dual Brakes & IP Ratings
A 70 km/h scooter is not just fast. It is a machine that demands respect — and a machine that must protect its rider.
The KuKirin G4 Ultra delivers serious performance. Dual 1000W motors. 2,400W peak output. 70 km/h top speed. But performance without safety is incomplete.
This guide covers every safety system on the G4 Ultra: temperature protection, braking, waterproofing, and speed limiting. These are the features that let you ride with confidence.
Temperature Protection System
High-performance riding generates heat. The G4 Ultra's dual motors and high-discharge battery work hard — and heat is the byproduct.
How temperature protection works:
Motor temperature monitoring
The controller continuously monitors motor temperature. During sustained high-power output — long climbs, repeated acceleration, or RACE mode — the system tracks heat buildup.
Battery temperature monitoring
The BMS (Battery Management System) monitors battery cell temperature. If the battery approaches unsafe temperatures, the system takes action.
What happens when temperature rises:
-
Power is reduced — the controller limits output to prevent overheating
-
Charging is stopped — the BMS cuts charging if the battery is too hot
-
Performance is protected — the system prioritises longevity over maximum output
Why it matters: Without temperature protection, sustained high performance can permanently damage motors and batteries. The G4 Ultra's system ensures that even aggressive riding does not destroy your investment.
Best practice: After a hard ride, let the scooter cool for 30–60 minutes before charging. Never charge a hot battery.
Braking System: 160mm Dual Discs
The G4 Ultra's braking system is one of its most important safety features.
Hardware:
-
Front 160mm disc brake
-
Rear 160mm disc brake
-
Front electronic cut-off brake
-
Rear electronic cut-off brake
160mm discs — larger than standard scooter discs — provide more braking surface, better heat dissipation, and stronger stopping power.
Dual electronic cut-off — when you pull either brake lever, the motor power is cut instantly. This prevents the motor from fighting against the brakes and ensures maximum braking efficiency.
Braking distance: 8–12 metres from top speed.
Why 160mm matters: At 70 km/h, braking generates significant heat. Larger discs dissipate that heat more effectively, reducing the risk of brake fade during repeated heavy braking — long descents, emergency stops, or aggressive riding.
Best practice: Use both brakes together. Shift your weight back slightly. Brake earlier than you think you need to.
IP Ratings: Protection Against Water and Dust
The G4 Ultra uses different IP ratings for different components — each matched to the level of protection that component needs.
Body: IPX4
The scooter body is rated IPX4 — protected against water splashes from any direction. This handles rain, puddles, and wet roads.
Battery: IP55
The battery pack is rated IP55 — dust-protected and protected against water jets. This is a higher level of protection than the body, which makes sense: the battery is the most sensitive and expensive component.
Motor: IPX6
The motor is rated IPX6 — protected against powerful water jets. This means the motor can handle heavy rain, splashing, and even direct hose spray without water ingress.
Why different ratings matter:
-
The body needs to handle general rain and splashes → IPX4
-
The battery needs extra protection → IP55
-
The motor faces direct water exposure from the road → IPX6
The takeaway: The G4 Ultra's critical components — battery and motor — have higher protection than the body. This is a thoughtful design that prioritises the parts most vulnerable to water damage.
Speed Limit Mode
Not every road, path, or country allows 70 km/h. The G4 Ultra includes a speed limit mode for compliance.
How to activate:
-
Squeeze the brake lever
-
Double-press the power button while holding the brake
What happens:
-
A white dot lights up on the display
-
Top speed is limited to comply with local regulations
-
The scooter becomes legal for restricted zones
To deactivate: Repeat the same sequence.
Why it matters: In many European countries, e-scooters are limited to 20–25 km/h on public roads. Speed limit mode lets you stay legal without modifying your scooter.
Safety Reminder: Ride Within the Law
The G4 Ultra is a high-performance scooter. With that performance comes responsibility.
High-speed riding is only appropriate in:
-
Private land with the owner's permission
-
Closed courses and tracks
-
Areas where local laws permit higher speeds
Before riding on public roads:
-
Check your country's e-scooter regulations
-
Confirm the speed limit for your area
-
Activate speed limit mode if required
-
Wear a CE EN 1078 certified helmet
-
Consider additional protective gear
The golden rule: The G4 Ultra's safety systems protect you — but they cannot replace responsible riding. Know the law. Ride within your limits.
Frequently Asked Questions (FAQ)
Q1: What safety features does the G4 Ultra have?
Temperature protection for motor and battery, 160mm dual disc brakes with electronic cut-off, IPX4 body protection, IP55 battery protection, IPX6 motor protection, and a speed limit mode.
Q2: What is the braking distance of the G4 Ultra?
8–12 metres from top speed. This is consistent with other high-performance scooters in its class.
Q3: What does IPX4 mean?
IPX4 means the scooter body is protected against water splashes from any direction. It can handle rain and wet roads.
Q4: Why does the battery have IP55 and the body have IPX4?
The battery is the most sensitive and expensive component. IP55 provides dust protection plus resistance to water jets — a higher level than the body's IPX4. The motor also has IPX6 for extra protection against direct water exposure.
Q5: Can I ride the G4 Ultra in the rain?
The G4 Ultra's body (IPX4), battery (IP55), and motor (IPX6) are all protected against water. Light rain and wet roads are fine. However, avoid deep puddles and never submerge the scooter.
Q6: What happens if the motor or battery overheats?
The controller reduces power output to protect the components. The BMS may also stop charging if the battery is too hot. This prevents permanent damage.
Q7: How do I activate speed limit mode?
Squeeze the brake lever and double-press the power button at the same time. A white dot on the display confirms the mode is active.
Conclusion: Performance You Can Trust
The G4 Ultra is fast. But it is also designed to be safe.
-
Temperature protection — motor and battery monitored continuously
-
160mm dual disc brakes — strong stopping power with electronic cut-off
-
IP55 battery, IPX6 motor — critical components protected from water
-
Speed limit mode — legal riding at the touch of a button
High performance is only meaningful if you can trust the machine beneath you. The G4 Ultra's safety systems are designed to earn that trust.
Ride fast. Ride safe. Ride smart.