RoundOne Rear Bike Light

£14.99 Regular price £19.99
Rear warning light with reflector
Product highlights
  • Motion sensing technology
  • Reflectors embedded into lens
  • Clothing / bag clip included
  • IPX6 Waterproof

Introducing the RoundOne 10 lumen rear bike light.

Ideal for commuters and road cyclists and a great choice for children's bikes this light has 5 operating modes including steady, flash and daytime flash. .

Works well as an extra warning light for night or daytime use. IPX6 water proofing, smart memory and motion sensing technology this light is packed with features.

At just 34 grams this light is a good lightweight option and can be worn on bags and clothes as well as attaching to your bike.

Motion sensing technology

Revolutionary motion sensing technology. The RoundOne automatically turns off after 120 seconds when stopped. When motion is detected again the light automatically turns on in the previously selected mode.

Smart memory

Have a favourite mode? The RoundOne rear light remembers the last selected mode next time it powers up. Starting your ride is quick and painless.


Now with EasyClip for quick removal from your bike. EasyClip works on bags, coats and belts. This light can be used on your bike or wherever you chose to clip it.

Long battery life and fast charging

With an amazing 60 hours max battery life there's no need to charge before each ride. Recharging is easy via a micro USB cable (included).

Operating modes
Mode Brightness Runtime
High steady 10 lumens
Low steady
5 lumens 12.5hrs
High flash
10 lumens 32hrs
Low flash
5 lumens 60hrs
Daytime flash
5 lumens


Dimensions 40.8mm x 40.8mm x 17mm
Weight 34.6g
Max lumens 10
Visible from >1000m
Waterproof IPX6
Battery Lithium 500mAh
LED / Bulb Red
Charging Micro USB (cable included)
Manufacturer Gaciron

If you need your lights quickly we offer Express delivery otherwise our Standard delivery takes 2-3 days. All deliveries are trackable and we will send you a tracking number when your order is shipped.

Standard: Free over £50 spend, otherwise £2.99

Express: £1.99 over £50 spend, otherwise £3.99

Like most online stores we charge additional postage to the Highlands & Islands and Northern Ireland. This is to cover the additional cost from the courier.

Read our delivery information for full details.

Lumens explained

What is a lumen?

Lumens measure how much light you are getting from a bulb. The more lumens you have the brighter the light; fewer lumens means it's a dimmer light.

Do lumens matter?

Yes they do however it also depends on the ambient light conditions and which mode you are using. A 10 lumen rear light with a flashing pattern can be more effective than a 80 lumen solid beam at getting you noticed.

How many lumens should my front bike light be?

For general road use between 400 and 1000 lumens is recommended. For off-road use or unlit roads 1000+ lumens is advisable. Just make sure you're not dazzling other road users.

How many lumens should my rear bike light be?

A rear bike light can range from 5 lumens up to 300 lumens. Remember your rear light is about being seen rather than lighting your way. Look out for flashing patterns and breaking modes rather than a super high lumen rating.