Brake Sensing Tech
Automatic deceleration flashing alerts following traffic during braking.
Bike lights
/ J-MEX
8.7
J-MEX Bike lights
Precision-engineered rear signaling devices featuring advanced motion sensing and cargo-ready mounting solutions
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What stands out
Cargo Rack Integration
Specific bolt spacing supports 50mm and 80mm rack mounts.
Smart Power Management
Auto on/off functionality conserves battery based on motion.
Why we keep it
Intelligent Rear Signaling Standards
The BikeSpark series utilizes precise motion sensors to detect deceleration and movement. These units are built with large reflectors and specialized mounting hardware for cargo racks.
- Precise brake sensing technology
- Auto on/off motion activation
- 50/80mm screw mounted hardware
- USB-C and Type-C rechargeable ports
- Integrated AirTag mount options
- IPX5 water resistant housing
What sets them apart
What is here
This J-MEX set is built around Bicycle taillights, USB rechargeable bike lights, Brake sensing bike lights, Smart sensor bike lights.
How they are built
J-MEX keeps the build language in the product names: Cargo Rack Taillight with Brake Sensing; Brake Sensing Taillight with AirTag Mount; Superbright Auto Sensing Rear Tail Light.
Made to use
The range is aimed at the uses named in Bicycle taillights, USB rechargeable bike lights, Brake sensing bike lights, Smart sensor bike lights, not a catch-all.
How they differ
Use Bicycle taillights, USB rechargeable bike lights, Brake sensing bike lights, Smart sensor bike lights to tell one J-MEX model from the next.
Catalog
4 lights in this set
Collections Brake sensing USB rechargeable
Quick take
What stands out
From reading 16 reviews
Often liked
- Battery life 6
- Auto on/off sensing 5
- Bright LED output 5
- Brake light accuracy 4
- Brake light response 4
- Motion auto on/off 4
- Brightness 3
- Light modes variety 3
- Secure mounting 1
Minus side
- Missing instructions 3
- Secure mounting 2
- Brightness 1
Buyers
From this set
The brake sensing on the G4R is very precise and gives me confidence when carrying heavy loads on my cargo rack.
I love the auto on/off feature because I never have to remember to click the button when I start my ride.
The 80mm bolt spacing fit my rear rack perfectly and the large reflector is a great backup safety feature.
FAQ
J-MEX Questions
How does the brake sensing feature work?
The lights use motion sensors to detect deceleration. When you slow down, the light automatically triggers a bright flash to warn vehicles behind you.
Will these lights fit a standard rear cargo rack?
Yes, the models are designed with 50mm and 80mm screw mounting options. This makes them compatible with most standard bicycle cargo racks.
What is the battery life of the BikeSpark G4R?
The G4R model is rated for up to 240 hours of use. It is USB rechargeable for easy power replenishment.
Are these lights weather-resistant?
The units feature an IPX5 water-resistant rating. This protects the light against splashes and rain during outdoor use.