Garmin Varia RTL515 vs RVR315: Which Cycling Radar Should You Buy?
What to Look For
Garmin’s Varia rear-view radar range has two entry points — the RTL515, already reviewed here, and the RVR315, reviewed separately. Both use the same underlying radar detection technology, so the choice comes down to one feature rather than raw performance.
Garmin Varia RTL515
- Radar + taillight combined — a bright integrated LED taillight alongside the radar unit, so you don’t need a separate light.
- Weight — 71g.
- Detection range — up to 145m line of sight, same as the RVR315.
- Price — £149.99, verified in stock on Tredz.
Garmin Varia RVR315
- Radar only, no light — pairs with whatever taillight you already run.
- Weight — 51g, 20g lighter than the RTL515.
- Detection range — identical 145m radar performance to the RTL515.
- Price — £109, verified in stock on Tredz — the cheaper way into the Varia ecosystem.
Verdict
Since both units share identical radar detection, this is a straightforward decision: if you don’t already own a decent rear light, buy the RTL515 and get both in one unit for £40 more. If you already run a taillight you’re happy with, the RVR315 gives you the same rearward vehicle-detection alerts on your Garmin Edge or compatible watch for £40 less and 20g lighter — there’s no radar performance you’re giving up by choosing it.
Buying Tips
- Both require a compatible Garmin Edge computer or watch to display alerts — check compatibility before buying.
- If choosing the RVR315, pair it with a taillight running a similar or brighter lumen output so you’re not creating a mismatch in visibility.
- Charge fully before long rides — radar units draw more battery than a standalone taillight and typically last 6-20 hours depending on mode.
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