--- product_id: 346533951 title: "Auto-Sensing Rear Light G4R, USB Rechargeable, 240HRs, Precise Brake Sensing for Cargo Rack, Large Reflector, 50/80mm Screw Mounted, Easy Release, Made in Taiwan" brand: "bikespark" price: "366.35 DT" currency: TND in_stock: true url: https://www.desertcart.tn/products/346533951-auto-sensing-rear-light-g4r-usb-rechargeable-240hrs-precise-brake store_origin: TN region: Tunisia --- # 50 Lumen Ultra-Bright LEDs 240HR USB Rechargeable Runtime Precise Auto Brake Sensing Tech Auto-Sensing Rear Light G4R, USB Rechargeable, 240HRs, Precise Brake Sensing for Cargo Rack, Large Reflector, 50/80mm Screw Mounted, Easy Release, Made in Taiwan **Brand:** bikespark **Price:** 366.35 DT **Availability:** βœ… In Stock ## Summary > πŸš΄β€β™‚οΈ Light up your ride, stay ahead of the pack! ## Quick Answers - **What is this?** Auto-Sensing Rear Light G4R, USB Rechargeable, 240HRs, Precise Brake Sensing for Cargo Rack, Large Reflector, 50/80mm Screw Mounted, Easy Release, Made in Taiwan by bikespark - **How much does it cost?** 366.35 DT with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/346533951-auto-sensing-rear-light-g4r-usb-rechargeable-240hrs-precise-brake) ## Best For - bikespark enthusiasts ## Why This Product - Trusted bikespark brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Smart Brake Alert:** Instant ultra-bright boost on deceleration for safer rides - β€’ **Quick Snap Mounting:** Tool-free rack mount with easy release for on-the-go convenience - β€’ **Effortless Auto On/Off:** Motion-activated lighting means no more forgotten switches - β€’ **Weatherproof Durability:** IPX6 water resistance keeps you glowing rain or shine - β€’ **Regulation-Ready Visibility:** 220Β° wide-angle LEDs and reflector exceed EU & German safety standards ## Overview The BikeSpark Auto-Sensing Rear Light G4R is a USB rechargeable, ultra-bright bike safety light featuring patented deceleration sensing technology that boosts brightness instantly when braking. With 240 hours of runtime, 4 lighting modes, and a highly reflective surface exceeding EU and German standards, it ensures maximum visibility. Designed for quick rack mounting and IPX6 water resistance, this Taiwanese-made light combines cutting-edge safety with effortless convenience for professional cyclists and urban commuters alike. ## Description Auto-Sensing Rear Light G4R, USB Rechargeable, 240HRs, Precise Brake Sensing for Cargo Rack, Large Reflector, 50/80mm Screw Mounted, Easy Release, Made in Taiwan ## Features - Upgrade Your Reflector to BKS-G4R Now! - BikeSpark’s Auto-Sensing Rear Lights detect bike deceleration with an innovative deceleration sensing algorithm, Vsenx (US Patent No.: 10427594 B2). Once deceleration is detected, BikeSpark increases the brightness to ultrabright for 2.5 seconds, alerting and improving the reaction time of the person in any vehicle traveling behind. - Automatic ON/OFF - Press the Control Button to turn on the light and you are good to go. Never have to remember to turn off your rear light again! BikeSpark turns off automatically after 1 minute of inactivity, and turns on when motion is detected. The perfect balance of convenience, battery life and riding safety. - Great Brightness meeting Regulatory Compliance - Super bright LEDs provide excellent long distance and 220 degree visibility, up to 50 lm with low power consumption. Besides, two constantly-on lighting modes meet ISO 6742 1/3/5, and Germany StVZO Regulations help you riding safely in the darkest nights. - Highly Reflective Reflector Meeting Regulatory Compliance: BikeSpark BKS-G4R equips with the world-class vehicle reflector. The highly reflective reflector not only meets German and EU compliance but also provides up to 30% more than required reflective brightness. - Made in Taiwan / Quick Mounting / Snap to Release / 4 Lighting Modes / Li-polymer Rechargeable / IPX6 Water Resistance / Low Battery Indicator / Upgrade Your Reflector to BKS-G4R Now! ## Technical Specifications | Specification | Value | |---------------|-------| | Color | Black, Red | | Brand | BikeSpark | | Power Source | Battery Powered | | Water Resistance Level | Water Resistant | | Item Weight | 0.08 Kilograms | | Mounting Type | Rack Mount | | Product Dimensions | 4.25"L x 1.57"W x 1.3"H | | Number of settings | 4 | | Brightness | 50 Lumen | | Auto Part Position | Rear | | International Protection Rating | IPX6 | | Manufacturer | J-MEX Inc. | | Item Package Dimensions L x W x H | 4.72 x 3.58 x 1.85 inches | | Package Weight | 0.12 Kilograms | | Item Dimensions LxWxH | 4.25 x 1.57 x 1.3 inches | | Brand Name | BikeSpark | | Warranty Description | 1 Year | | Suggested Users | outdoors | | Part Number | AQ-6OW2-VCVP | ## Product Details - **Color:** Black, Red - **Brand:** BikeSpark - **Power Source:** Battery Powered - **Water Resistance Level:** Water Resistant - **Item Weight:** 0.08 Kilograms - **Mounting Type:** Rack Mount - **Product Dimensions:** 4.25"L x 1.57"W x 1.3"H - **Number of settings:** 4 - **Brightness:** 50 Lumen - **Auto Part Position:** Rear ## Images ![Auto-Sensing Rear Light G4R, USB Rechargeable, 240HRs, Precise Brake Sensing for Cargo Rack, Large Reflector, 50/80mm Screw Mounted, Easy Release, Made in Taiwan - Image 1](https://m.media-amazon.com/images/I/71onBMCdx7L.jpg) ## Questions & Answers **Q: Does the company offer replacement brackets? I don’t want to buy a whole second light to get a bracket.** A: On the Q & A section on the product page, BikeSpark says they don't sell extra brackets, and don't recommend moving the light from bike to bike, but they don't say why. It would seem if you can safely remove the light to prevent theft, moving it to another bike shouldn't be a problem. I wanted a second bracket as well and found it wasn't available. I think the 'problem' is that they want to put the bottom-line ahead of customer satisfaction. It's a great light, don't get me wrong, but customers should be able to use it as they see fit. **Q: Does light go out when fully charged?** A: Yes the light goes out after fully charged **Q: where is the photo of the mounting bracket to the rack ?** A: The mounting bracket has 2 bolts that fit the standard reflector mounting holes in the rear rack. **Q: Does it come with a mount?** A: Yes. It's designed to mount on a flat surface like the rear of a metal bike luggage rack which usually has the standard holes pre drilled. The mount stays on the bike and the actual light securely snaps into it. It is the best light you can possibly buy for a bike. Make sure you get the rechargeable model. ## Frequently Bought Together - BikeSpark Auto-Sensing Rear Light G4R, USB Rechargeable, 240HRs, Precise Brake Sensing for Cargo Rack, Large Reflector, 50/80mm Screw Mounted, Easy Release, Made in Taiwan - BriskMore Handlebar Bike Mirror, Scratch Resistant Glass Lens, Ajustable and Rotatable Safe Rearview Bicycle Mirror - ROCKBROS Bike Bell Classic Bicycle Bell Mountain Bike Bells for Adults with Loud Sound and Fit for 0.87-1.25in/22.2-31.8mm Bicycle Handlebars --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.tn/products/346533951-auto-sensing-rear-light-g4r-usb-rechargeable-240hrs-precise-brake](https://www.desertcart.tn/products/346533951-auto-sensing-rear-light-g4r-usb-rechargeable-240hrs-precise-brake) --- *Product available on Desertcart Tunisia* *Store origin: TN* *Last updated: 2026-06-04*