BikeSpark BKS-G5 Auto-Sensing Rear Bike Light — AirTag Mount, USB-C Rechargeable, Deceleration Boost

The BikeSpark BKS-G5 is an auto-sensing rear bike light that boosts brightness instantly when it detects deceleration, doubles as an AirTag mount, and recharges via Type-C for reliable, regulation-compliant rear visibility.

Compact and engineered in Taiwan, the BKS-G5 combines an intelligent deceleration algorithm with strong reflector performance and multiple light modes to improve how others perceive your bike on the road. It’s designed for riders who want a smart, low-maintenance taillight that meets StVZO-style visibility standards, mounts to common cargo-rack bolt spacings, and offers convenient tracking capability with an Apple AirTag (AirTag sold separately).

How does the auto-sensing brake detection work?

The BKS-G5 uses BikeSpark’s patented Vsenx deceleration-sensing algorithm to recognize rapid slowing and temporarily raise output to an ultra-bright pulse for 2.5 seconds. This short, intense flash is meant to draw attention from following traffic without continuous high power drain.

• Patented detection algorithm (Vsenx, US Patent 10427594 B2)
• 2.5-second ultra-bright boost when deceleration is detected
• Detects changes in motion—no external sensors needed
• Works automatically while the light is powered on

What mounting options and compatibility does the light offer?

The housing fits common cargo-rack bolt spacings and includes a large built-in reflector to meet regulatory visibility requirements. Its installation is targeted at rack-mounted setups but can be adapted with compatible brackets for other rear mounts.

• Mounting compatible with 50 mm and 80 mm bolt spacing
• Large, high-efficiency vehicle reflector compliant with StVZO-like standards
• Low-profile casing designed for rack placement and rear visibility
• Tool-free AirTag compartment for added tracking capability

How long does the battery last and how is it recharged?

The BKS-G5 includes a built-in 550 mAh Li‑polymer cell and recharges through a convenient USB-C port for fast, routine topping up. Automatic on/off intelligence helps conserve charge by shutting the unit off after inactivity and waking it with motion.

• 550 mAh internal Li‑polymer battery
• USB-C recharge port for universal, fast charging
• Auto-off after ~1 minute of inactivity to save power
• Auto-on when movement is detected, reducing user steps

Can I use it as a tracking mount and is it weather resistant?

The rear housing includes a snap-in pocket sized for an Apple AirTag so you can pair visibility with location tracking without extra mounts. While designed for outdoor cycling conditions, follow manufacturer care guidance for prolonged exposure—AirTag is not included.

• Integrated AirTag compartment with press-to-click installation
• No extra tools required to install or remove AirTag
• Durable casing and high-visibility reflector for wet-weather riding
• Designed for routine outdoor cycling use; maintain charging port cover clean

Who is this for: The BikeSpark BKS-G5 is aimed at commuters, cargo-riders and utility cyclists who need a smart rear light that enhances noticeability during braking, meets stringent reflector standards, and adds simple tracking via AirTag. It’s a good fit for riders wanting low-maintenance automatic operation, Type-C charging convenience, and a rack-focused mounting solution built in Taiwan.