Bike lights / J-MEX
7.9/10

J-MEX Bike lights

Precision-engineered rear signaling devices featuring advanced motion sensing and cargo-ready mounting solutions

Bicycle taillights USB rechargeable bike lights Brake sensing bike lights Smart sensor bike lights Bicycle reflectors USB-C bike lights IPX5 water resistant bike lights Universal bike lights
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Featured listing
Cargo Rack Taillight with Brake Sensing View details
What stands out

Brake Sensing Tech

Automatic deceleration flashing alerts following traffic during braking.

Cargo Rack Integration

Specific bolt spacing supports 50mm and 80mm rack mounts.

Smart Power Management

Auto on/off functionality conserves battery based on motion.

About this lineup

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
Built this way

Specialized Rack Mounting

Unlike standard seatpost lights, these models are designed for cargo racks. They feature 50mm and 80mm bolt spacing for a permanent, secure fit.

Motion-Based Automation

The G2 and G3 models include auto-sensing technology. The light activates when movement is detected and flashes brightly during deceleration.

Extended Battery Life

The G4R model offers up to 240 hours of operation. This makes it ideal for long-distance touring or heavy daily commuting.

Modern Connectivity

Newer iterations like the G5 include Type-C recharging. Some models also incorporate AirTag mounts for added bicycle security.

Catalog

4 lights in this lineup

First-hand

From this set

Amanda 4.4

The brake sensing on the G4R is very precise and gives me confidence when carrying heavy loads on my cargo rack.

Nicole 4.8

I love the auto on/off feature because I never have to remember to click the button when I start my ride.

Evelyn 4.2

The 80mm bolt spacing fit my rear rack perfectly and the large reflector is a great backup safety feature.

Common questions

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.