Radar Rear Bike Lights: How Radar Detection Works and What to Verify Before Ordering
A radar rear bike light adds rear-approach detection to the tail light, so the rider is warned about vehicles closing from behind without turning around.
Built for bicycle brands adding a safety tier, and for importers and distributors who have to explain integration to dealers before the first order. The light works on its own; the radar warning needs a receiving device.
How Ridingoutdoor supplies this category
Ridingoutdoor supplies radar rear lights for wholesale, OEM and private-label programmes, together with the lighting and mounting products that sit around them.
Ridingoutdoor is a sourcing and OEM execution partner, not a factory: radar models are produced with selected manufacturing partners and confirmed at model level.
The function, described plainly
Rear-approach detection
A radar element in the light detects vehicles closing from behind and reports them to a display or head unit. The rider gets a warning without turning around.
Detection range
Range is quoted as a maximum under stated conditions. Treat it as a comparative figure, not a guarantee in every road situation.
Brake sensing
Brake light modes react to deceleration, which is the function most riders notice in traffic.
Light output and modes
Radar models also work as a normal tail light, with flash and steady modes of their own.
Integration questions to settle before you order
Wireless protocol
Ask which wireless protocol the radar transmits on — ANT+ and BLE are the two common options — and whether the receiving head unit, computer or app supports it. Ridingoutdoor confirms this per model rather than assuming it.
Receiving device
A radar light is only useful if the rider has something to receive the warning. Decide whether your programme sells the light alone or as a bundle.
App requirement
If a phone app is involved, confirm operating system support, account requirements and whether the light works without the app.
Compatibility with existing ranges
If you already list lights from another supplier, confirm whether the radar can be received by the devices your customers already own.
Radar models in the current range
Both models share the same core radar and output specification. Water resistance, detection distance and battery capacity are stated on each product page exactly as the supplier confirms them.
Confirmed figures on the current radar models
| Radar alerting light | 90 lm red flash on detection — a warning flash, not a steady mode |
|---|---|
| Steady light modes | High 30 lm, Low 15 lm, Day Flash 50 lm, Night Flash 20 lm, Breathing 30 lm |
| Detection distance | Up to 140 m (supplier-stated maximum) — validate in your own test conditions |
| Radar beam width | 40 degrees, covering typical bends in the road |
| Vehicles detected | Up to 8 approaching vehicles at one time |
| Not detected | Vehicles travelling at the same speed as the rider |
| Brake light | 50 lm, light ring for 3 seconds |
| Battery | Rechargeable built-in Li-Poly, 1100 mAh; USB-C, approx. 2-3 hours to full |
| Water resistance | IP64 as stated on the model page |
| Operating temperature | -20 to 50 °C (-4 to 122 °F) |
| Charging temperature | 0 to 45 °C (32 to 113 °F) |
| Sleep behaviour | Auto on/off mode sleeps after 60 seconds of stillness; the radar does not detect while asleep |
| Battery service | Flathead screwdriver to open the cover, unscrew the PCB and disconnect the cell |
| Body | Aluminium alloy and plastic, approx. 62 g |
| Mounting | Seatpost mounting, 250-1200 mm above the road; aero-seatpost support confirmed per model |
| Connectivity | LW-R90: Not supported. This model cannot be paired with a bike computer or smartphone; warnings stay on the light through the 90 lm flash and the built-in speaker. LW-R90 PRO: ANT+ connection to a compatible GPS bike computer, Bluetooth connection to a compatible smartphone, and the Cycling Radar App. See each model page. |
Who buys radar rear lights
Choosing between the two models for a distributor, wholesaler or brand range
Both models carry the same radar, light and alarm hardware. The decision is about what your customer already owns, and where the detection result has to appear.
Choose LW-R90 when
- Your customer rides without a compatible bike computer or a phone on the bike, so a paired display would never be used.
- You need one radar SKU rather than two, or the range price point has to stay simple.
- You are positioning the light on its own merit: the radar, light and alarm specification is unchanged.
Choose LW-R90 PRO when
- Your customers already own ANT+ bike computers or run a phone on the bike, so vehicle position and threat level have somewhere to go.
- You are targeting commuter, city or e-bike programmes where riders read ride data on a device.
- You want one model to cover both the no-device buyer and the connected buyer, which keeps the range shorter than two separate radar lines.
Check before you commit
- Which bike computer brands and phone models your customers actually own. Icons and menus differ by brand.
- Whether an ANT+ pairing requirement changes your packaging, manual or onboarding material for the destination market.
- Whether a second radar SKU is worth the range complexity against the value of the connected version.
Bicycle brands
Brands building a safety tier above standard tail lights, where the radar function justifies a higher shelf position and a bundle discussion.
Importers and distributors
Distributors who need to brief dealers on integration, so that returns do not come from a mismatch between light and head unit.
Private-label programmes
Buyers who need their own branding on the light, plus packaging that explains the function honestly.
E-bike and commuter programmes
Segments where a rear-approach warning is most valued: commuter, city and higher-speed e-bike use.
What can be customised
| Logo | Available, subject to project confirmation |
|---|---|
| Packaging | Colour box artwork — available |
| Manual | Language and layout — available |
| Product colour | Custom colour — available |
| Standard order MOQ | Confirmed per model; published where the supplier has confirmed it |
| Sampling | Available — see the Sample Policy |
| Programme management | Sourcing, specification confirmation, quality control and export execution |
OEM and private-label solutions · Radar Tail Lights category · Sourcing and quality process
Installation and daily operation
The manual gives a mounting height, an angle requirement and two switches. These matter for programme documentation because they are the points most often missing from retailer instructions.
| Mounting height | 250 mm to 1200 mm above the road |
|---|---|
| Mounting angle | The mount surface should be vertical. A typical seatpost sits at about a 15-degree angle to vertical, which the mount has to accommodate. |
| Orientation | The light faces backward, perpendicular to the road. |
| Battery indicator | Five levels: green 100-70%, blue 70-30%, red 30-15%, flashing red below 15%. Solid red while charging, solid green when charging is complete. |
| Radar switch | Hold for 2 seconds to turn the radar off, press for 2 seconds to turn it back on. The radar indicator shows blue when the radar is on. |
| Speaker switch | Press to turn the alarm speaker on or off. Solid blue when on, flashing blue when off. |
| Mode switching | Press the light switch to change mode. Double-click to toggle between manual mode (solid indicator) and auto on/off mode (flashing indicator). |
The device can improve situational awareness. It is not a replacement for cyclist attentiveness and good judgement.
Where to go next
Category pages
Browse the Radar Tail Lights category, the wider Bicycle Lights range, or Mounts & Adapters for the AY286 universal mount and the AY620 adapter for the RO-RZ series.
Lighting output guide
Compare claimed performance properly in Bike Light Lumens vs Lux.
Before you shortlist
Radar rear bike lights — common buyer questions
Do the radar models work without a head unit?
Yes. The light function works on its own, and so does the radar warning. On the LW-R90 the alert reaches the rider through the 90 lm flashing light and the built-in speaker on the unit, with no paired device needed. On the LW-R90 PRO the same warnings are also delivered to a paired bike computer or phone, and the paired device adds vehicle position and threat level. Confirm which devices your customers own before you position the product.
Is the LW-R90 the same as the LW-R90 PRO, just cheaper?
No. They are the same light with a different level of connectivity. The LW-R90 is standalone: the manufacturer states it cannot be paired with bike computers or smartphones, so the warning reaches the rider only through the 90 lm radar alerting flash and the built-in speaker on the light itself. The LW-R90 PRO adds three connections — ANT+ to a compatible GPS bike computer, Bluetooth to a compatible smartphone, and the Cycling Radar App, which shows vehicle position and threat level. Radar range, beam width, vehicle count, light modes, output, battery, charging, water resistance and sleep behaviour are the same on both models.
How reliable is the quoted detection distance?
The published figure is a supplier-stated maximum. Real-world range depends on road geometry, traffic and mounting height, so validate it in your own test conditions.
Can the radar models be branded for our programme?
Yes — logo, packaging, manual and colour customisation are available subject to project confirmation.
Are these lights waterproof?
Water resistance is specified per model and stated on the product page. We do not publish a rating the supplier has not confirmed.
Do the radar rear lights need a phone or bike computer?
The LW-R90 does not. It is a standalone model and cannot be paired with bike computers or smartphones; the alert is delivered by the light and its built-in speaker. The LW-R90 PRO can be paired with a compatible ANT+ GPS bike computer or a compatible smartphone, and the warning is then also shown on that device.
How is the LW-R90 PRO connected over ANT+?
Bring the bike computer and the light within about 3 m of each other, keep other ANT+ sensors roughly 10 m away, switch on both, search for the sensor on the computer and add it. After the first pairing the computer reconnects on its own when the light is on and within range. Menu wording and radar icons differ between brands, so the computer you actually use governs. We do not claim compatibility with every bike computer, phone or brand.
What are the limits of the radar detection?
Detection reaches up to a supplier-stated 140 m with a 40-degree beam and tracks up to eight approaching vehicles. The manual specifies an approaching vehicle speed range, but the exact reference for that figure is being confirmed with the supplier, so we do not publish it as a validated range yet. Vehicles travelling at the same speed as the rider are not detected, so a vehicle holding pace in the same lane will not trigger the alert. In auto on/off mode the light sleeps after 60 seconds of stillness and does not detect while asleep.
Is Ridingoutdoor a light factory?
No. Ridingoutdoor is a sourcing, OEM and private-label execution partner working with selected manufacturing partners.
Standard radar or connected radar: which one fits the programme
The two radar rear lights in the current range share the same core specification. Both detect rear approach at a stated 140 m, both flash 90 lm on radar detection with the same five steady modes, both use a 1100 mAh Li-Poly battery, and both are rated IP64 at 80 × 30 × 23 mm and 62 g. The difference is not brightness, range or battery. It is connectivity — and whether that matters depends entirely on what your rider already owns.
| Specification | LW-R90 | LW-R90 PRO |
|---|---|---|
| Connectivity | Not supported. This model cannot be paired with a bike computer or smartphone; warnings stay on the light. | ANT+ connection to a compatible GPS bike computer, Bluetooth connection to a compatible smartphone, and the Cycling Radar App. |
| Best suited to | Programmes that sell the light on its own, or bundle it with a head unit the buyer supplies. | Programmes whose customers already run a compatible bike computer or phone and want the warning on a screen they are already looking at. |
| What is identical | Radar alerting light 90 lm flash · radar detection distance up to 140 m (supplier-stated maximum) · radar beam width 40 degrees · up to 8 vehicles detected · vehicles at the same speed as the rider not detected · brake light 50 lm for 3 seconds · battery 1100 mAh Li-Poly · USB-C charging approx. 2-3 hours · water resistance IP64 · operating temperature -20 to 50 °C · charging temperature 0 to 45 °C · sleep after 60 seconds of stillness with no radar detection · body aluminium alloy and plastic · size 80 × 30 × 23 mm · net weight 62 g · the same five modes with the same stated output and runtime · seatpost mounting. No core performance figure differs between the two models. | |
| Availability | Both models are available for OEM and private-label programmes. Logo, packaging, manual and colour customisation are available subject to project confirmation, confirmed per model with the manufacturing partner before sampling. Standard order quantity and lead time are confirmed per project; price is quoted on request. See the Radar Tail Lights category page for the full range. | |
Request a quote
Send the models you are considering, your destination market, target quantity and whether you need standard, OEM or private-label execution. We will come back with confirmed specifications, sampling steps, lead time and documentation status for the models you shortlist.