{"product_id":"garmin-varia-rvr315-rear-radar-cycling-light-for-road-safety","title":"Garmin Varia RVR315 Rear Radar Cycling Light for Road Safety","description":"\u003cp\u003eThe \u003cstrong\u003eGarmin Varia RVR315\u003c\/strong\u003e is a rear cycling radar and light combined into a single, compact unit — and it's one of the most genuinely useful safety upgrades you can add to any road or gravel bike. The RVR315 detects approaching vehicles from up to \u003cstrong\u003e140 metres behind you\u003c\/strong\u003e and alerts you via a paired Garmin Edge computer, compatible head unit, or the Varia app on your smartphone, giving you advance warning of traffic long before you'd hear or see it yourself.\u003c\/p\u003e\n\n\u003cp\u003eThe integrated rear light is no afterthought: it operates in \u003cstrong\u003esolid and flashing modes\u003c\/strong\u003e and automatically adjusts brightness based on ambient light conditions, ensuring you're always visible to drivers without you having to think about it. The aerodynamic, low-profile design adds minimal drag and weight to your seatpost, and installation takes seconds with the included mount. Battery life is strong enough for extended rides, and the unit charges via USB.\u003c\/p\u003e\n\n\u003cp\u003eWhere the Varia RVR315 really earns its place is in the ecosystem integration. Paired with a \u003ca href=\"\/collections\/computers-gps\"\u003eGarmin Edge computer\u003c\/a\u003e, approaching vehicles appear as alerts on your screen — a yellow alert for a vehicle detected in the distance, turning red as it closes in. This gives you time to move to a safer road position, check your mirror, or simply ride with greater awareness and confidence. It's particularly valuable on fast descents, narrow lanes, and any road where you can't easily look behind you. Browse the full \u003ca href=\"\/collections\/garmin\"\u003eGarmin range\u003c\/a\u003e or explore our complete \u003ca href=\"\/collections\/lights\"\u003elights collection\u003c\/a\u003e and \u003ca href=\"\/collections\/rear-lights\"\u003erear lights\u003c\/a\u003e for complementary products.\u003c\/p\u003e\n\n\u003cp\u003eThe RVR315 is the radar-only variant in the Varia range — if you'd prefer a model with a more powerful integrated light, explore the wider Varia lineup. For most road and gravel riders, the RVR315 strikes an excellent balance of radar capability, light output, and compact form factor.\u003c\/p\u003e\n\n\u003ch3\u003eWhat It's Good For\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDetecting approaching vehicles up to 140m behind you and alerting you via a paired Garmin Edge or the Varia app\u003c\/li\u003e\n\u003cli\u003eAdaptive rear light that automatically adjusts brightness to ambient conditions\u003c\/li\u003e\n\u003cli\u003eRoad and gravel riding where rear traffic awareness significantly improves safety\u003c\/li\u003e\n\u003cli\u003eSeamless integration with Garmin Edge computers for on-screen vehicle alerts\u003c\/li\u003e\n\u003cli\u003eFast descents, narrow lanes, and any situation where looking behind is difficult or dangerous\u003c\/li\u003e\n\u003cli\u003eCompact, aerodynamic seatpost mount with quick installation\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat It's NOT Good For\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eOff-road MTB use where rear vehicle traffic is not a concern\u003c\/li\u003e\n\u003cli\u003eRiders wanting a high-powered rear light as their primary visibility tool — the RVR315's light is designed to complement the radar function; other Varia models offer more powerful light output\u003c\/li\u003e\n\u003cli\u003eUse without a paired device — radar alerts require a compatible Garmin Edge computer, head unit, or the Varia smartphone app to be displayed\u003c\/li\u003e\n\u003cli\u003eReplacing attentive riding and road awareness — the Varia is a safety aid, not a substitute for good road craft\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eHow does the radar work?\u003c\/strong\u003e\u003cbr\u003eThe Varia RVR315 uses radar technology to detect vehicles approaching from behind at up to 140 metres. When a vehicle is detected, an alert is sent to your paired Garmin Edge computer or the Varia smartphone app — a yellow indicator appears as the vehicle is detected, turning red as it closes in. This gives you several seconds of advance warning to adjust your road position.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eDoes it work without a Garmin Edge computer?\u003c\/strong\u003e\u003cbr\u003eYes — the Varia RVR315 can be paired with the free Varia app on a compatible smartphone to display radar alerts, so you don't need a Garmin Edge to benefit from the radar functionality. However, pairing with a \u003ca href=\"\/collections\/computers-gps\"\u003eGarmin Edge computer\u003c\/a\u003e gives the most seamless, glanceable experience.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhich Garmin Edge computers are compatible?\u003c\/strong\u003e\u003cbr\u003eThe Varia RVR315 is compatible with a wide range of Garmin Edge computers including the \u003ca href=\"\/products\/garmin-computers-gps-edge-540-gps-unit\"\u003eEdge 540\u003c\/a\u003e, \u003ca href=\"\/products\/garmin-computers-gps-edge-840-gps-unit\"\u003eEdge 840\u003c\/a\u003e, \u003ca href=\"\/products\/garmin-edge-r-850-gps-unit\"\u003eEdge 850\u003c\/a\u003e, \u003ca href=\"\/products\/garmin-gps-unit-edge-1040-unit-only-p108757\"\u003eEdge 1040\u003c\/a\u003e, and \u003ca href=\"\/products\/garmin-gps-unit-edge-1050-p134310\"\u003eEdge 1050\u003c\/a\u003e. Check Garmin's compatibility list for the full range of supported devices.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eHow long does the battery last?\u003c\/strong\u003e\u003cbr\u003eBattery life varies depending on the light mode used. In radar-only mode the battery lasts longer; combined radar and light modes reduce runtime. The unit charges via USB and is straightforward to top up between rides.\u003c\/p\u003e","brand":"Garmin","offers":[{"title":"Default Title","offer_id":45471938871471,"sku":"010-02254-00","price":126.75,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0654\/2003\/4223\/files\/Screenshot2026-04-03091836.jpg?v=1775204406","url":"https:\/\/www.swinnertoncycles.co.uk\/products\/garmin-varia-rvr315-rear-radar-cycling-light-for-road-safety","provider":"Swinnerton Cycles","version":"1.0","type":"link"}