--- product_id: 391550594 title: "Auto-Sensing Rear Bike Tail Light G4R–[2022] USB Rechargeable – 240HRs - Precise Brake Sensing-for Cargo Rack- 50lumen - Large Reflector-50/80mm Screw Mounted/Easy Release -Made in Taiwan" brand: "bikespark" price: "KD 31.76" currency: KWD in_stock: true url: https://www.desertcart.com.kw/products/391550594-auto-sensing-rear-bike-tail-light-g4r-2022-usb-rechargeable store_origin: KW region: Kuwait --- # 240+ hrs runtime 50/80mm quick mount bracket 50 lumen max brightness Auto-Sensing Rear Bike Tail Light G4R–[2022] USB Rechargeable – 240HRs - Precise Brake Sensing-for Cargo Rack- 50lumen - Large Reflector-50/80mm Screw Mounted/Easy Release -Made in Taiwan **Brand:** bikespark **Price:** KD 31.76 **Availability:** ✅ In Stock ## Summary > 🚴‍♂️ Light up your ride, own the night, and never get left behind! ## Quick Answers - **What is this?** Auto-Sensing Rear Bike Tail Light G4R–[2022] USB Rechargeable – 240HRs - Precise Brake Sensing-for Cargo Rack- 50lumen - Large Reflector-50/80mm Screw Mounted/Easy Release -Made in Taiwan by bikespark - **How much does it cost?** KD 31.76 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.com.kw](https://www.desertcart.com.kw/products/391550594-auto-sensing-rear-bike-tail-light-g4r-2022-usb-rechargeable) ## 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 - • **Set & Forget Power:** Automatic ON/OFF with motion detection means no wasted battery or forgotten lights. - • **Effortless Mounting:** Quick snap-release bracket fits standard 50/80mm racks for fast, tool-free installation. - • **Ultra-Wide Visibility:** 220° beam angle with 14 sideview + 2 superbright LEDs ensures you're seen from every angle. - • **Brake Brightness Boost:** Patented auto-sensing tech instantly amps brightness on deceleration for ultimate rear visibility. - • **Weatherproof & Durable:** IPX6 water resistance and rugged materials built to withstand all your urban or off-road rides. ## Overview The BikeSpark BKS-G4R is a premium auto-sensing rear bike tail light engineered in Taiwan, featuring patented brake detection that boosts brightness instantly to alert traffic behind you. With up to 240 hours of runtime across 4 lighting modes, a powerful 50-lumen output, and a wide 220° visibility angle, it combines safety and convenience. Its IPX6 water resistance, quick-release mounting compatible with 50/80mm racks, and low battery indicator make it the perfect upgrade for professional cyclists seeking reliable, hands-free safety on every ride. ## Description BikeSpark BKS-G4R Auto-sensing Rear Light for cargo carrier meets ISO 6742, StVZO K/Z/ECE/E mark. It offers a perfect balance of self-illuminating source from LEDs and reflective light with the reflector. It provides unique 4 lighting pattens, directly working with the reflector while providing brake warning light in deceleration. With the Strobe Flash mode, it enhances the rider's safety with optimal visibility in the most efficient way, up to 240+ HRs runtime. Features& Specification:Precise Motion Sensor Warning Brake Light (US Patent No.: 10427594 B2).Automatic ON/OFFMicro-USB Li-polymer Battery 3.7V, 2000mAh14 Sideview LEDs, 2 Superbright LEDs, up to 50 Lumen MAX, 220 Degree Visibility.Low Battery Indicator: Yes.IPX6 Water Resistance.Firm and Secure Quick Mount, and Snap to Release Design.Bolts Spacing Compatibility on Rack 50 and 80 mm.4 Lighting Modes and Runtime Mode 1: Economic Lighting: 90+ HRs (Recharge Every 2 Months)Mode 2: Extended Lighting: 43+HRs (Recharge Every Month)Mode 3: Flashing Lighting: 160+ HRs (Recharge Every 3 Months)Mode 4: Strobe Flash Lighting: 240+ HRs (Recharge Every 3 Months) In the box:BikeSpark Auto-sensing Rear Light BKS-G4R *1A large-area Retroreflector embedded.A 50/80 mm Mounting Bracket – Quick Mount and Snap to ReleaseM5 Bolts/Lock Washers/Nuts *2Micro-USB Charging Cable *1Buy with No Risk - BikeSpark offers the highest quality lights that are required to pass our rigorous standard. We back all products with a 30 DAY No Question Asked Money-Back Guarantee — GET A FULL REFUND IF YOU ARE NOT 100% SATISFIED. BikeSpark also protects our customers with One Year Limited Product Warranty. 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 | Red | | Material Type | Aluminum, Polypropylene, Polyvinyl Chloride | | Power Source | Battery Powered | | Batteries Included? | Yes | | Brand | BikeSpark | | Department | outdoors | | Manufacturer | J-MEX Inc. | | Item model number | AQ-6OW2-VCVP | | Product Dimensions | 10.8 x 4 x 3.3 cm; 80 g | | ASIN | B0991V426W | ## Product Details - **Colour:** Red - **Brand:** BikeSpark - **Material:** Aluminum, Polypropylene, Polyvinyl Chloride - **Power source:** Battery Powered - **Water resistance level:** Water Resistant ## Images ![Auto-Sensing Rear Bike Tail Light G4R–[2022] USB Rechargeable – 240HRs - Precise Brake Sensing-for Cargo Rack- 50lumen - Large Reflector-50/80mm Screw Mounted/Easy Release -Made in Taiwan - Image 1](https://m.media-amazon.com/images/I/71onBMCdx7L.jpg) ![Auto-Sensing Rear Bike Tail Light G4R–[2022] USB Rechargeable – 240HRs - Precise Brake Sensing-for Cargo Rack- 50lumen - Large Reflector-50/80mm Screw Mounted/Easy Release -Made in Taiwan - Image 2](https://m.media-amazon.com/images/I/715VMiau+OL.jpg) ![Auto-Sensing Rear Bike Tail Light G4R–[2022] USB Rechargeable – 240HRs - Precise Brake Sensing-for Cargo Rack- 50lumen - Large Reflector-50/80mm Screw Mounted/Easy Release -Made in Taiwan - Image 3](https://m.media-amazon.com/images/I/81JM3msHxYL.jpg) ![Auto-Sensing Rear Bike Tail Light G4R–[2022] USB Rechargeable – 240HRs - Precise Brake Sensing-for Cargo Rack- 50lumen - Large Reflector-50/80mm Screw Mounted/Easy Release -Made in Taiwan - Image 4](https://m.media-amazon.com/images/I/710cHEcM5kL.jpg) ![Auto-Sensing Rear Bike Tail Light G4R–[2022] USB Rechargeable – 240HRs - Precise Brake Sensing-for Cargo Rack- 50lumen - Large Reflector-50/80mm Screw Mounted/Easy Release -Made in Taiwan - Image 5](https://m.media-amazon.com/images/I/71dcpBNz4aL.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? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.com.kw/products/391550594-auto-sensing-rear-bike-tail-light-g4r-2022-usb-rechargeable](https://www.desertcart.com.kw/products/391550594-auto-sensing-rear-bike-tail-light-g4r-2022-usb-rechargeable) --- *Product available on Desertcart Kuwait* *Store origin: KW* *Last updated: 2026-05-18*