Reflectors and other visibility parts on an e-bike

A reflector has no battery and no wire. It can't fail the way a light can, but it also can't do anything on its own. Another vehicle's lamps have to shine on it first.

How it works

A retroreflector is a device or surface that reflects light or other radiation back to its source with minimum scattering¹. On a bike, that source is usually a car's headlight, and the "returned" light goes back toward the driver.

That's also the limit. A general reference says reflectives are for being seen, and that they do nothing to light up the road². It adds that reflectors are not a substitute for lights, but are an important supplement to portable lighting².

The usual set on a bike

The passive parts differ by country. In the United States, rules come from the Consumer Product Safety Commission. Wikipedia's summary lists the set. A white reflector faces forward on the front. White reflectors face sideways on each wheel. A red reflector is mounted on the rear, and yellow reflectors go on the front and back of each pedal². The same source says many jurisdictions require bicycles to be fitted with reflectors at the point of sale².

Check the commission's own text for the current wording, since a summary may be out of date.

In the UK, the Highway Code says that at night your cycle must have white front and red rear lights lit. It must also be fitted with a red rear reflector³. It adds that white front reflectors and spoke reflectors will also help you to be seen³. The Code also mentions amber pedal reflectors on bikes made after a set date, so read the rule itself for the detail³.

A catch with pedals

Pedal reflectors catch the eye because they move. They can clash with some pedal types, though. One source says that unfortunately they are not compatible with most clipless pedal systems². If your bike has such pedals, your local rules and your manual decide what to do. Don't remove a required part on a guess.

Other things that help you be seen

Not all visibility parts are bolted to the bike. The Highway Code says reflective clothing and/or accessories (belt, arm or ankle bands) can increase your visibility in the dark³.

On the bike itself, one source says reflectors and reflective tape provide additional visibility, especially when applied to moving parts of the bicycle². Whether any of these counts toward a legal requirement depends on the rule in your area, not on what looks bright.

What to check on your own bike

• Is there a rear reflector, and is it clean and facing back?
• Are the wheel or spoke reflectors still there?
• Do the pedals carry reflectors, and does your local law ask for them?
• Is anything blocking a reflector, such as a pannier or a bag?
• Does the manual list the reflectors the bike shipped with?

Reflectors don't replace lights. For what your area asks for after dark, see where to find your local rules.