The Glance

The TriEye mirror sits in the lower outer corner of the lens — closest to traffic, furthest from the bridge of your nose. To check what's behind you, you don't turn your head. You tilt your eyes. About 10 to 15 degrees down and out.

That's the entire technique. The hardest part is unlearning the head-turn.

Why head-turning is risky

Most cyclists don't realise how much their bars follow their head. A small over-the-shoulder check at 35 km/h drifts your wheel 30–50 cm sideways — enough to put you into a passing car or a teammate's wheel. The eye-tilt keeps your hands still, your line straight, and your body silent on the bike. It's the difference between checking and reacting.

What it feels like

The first ride feels deliberate. You'll catch yourself turning your head out of habit and have to stop short. By the second or third ride the glance becomes automatic, like checking your speed on a bike computer. The mirror's lower-corner placement is intentional: it stays out of your forward view until you ask for it.

On the road

In rolling traffic you can spot a closing car before it's alongside. On group rides you can see whose wheel you've dropped without sitting up and breaking your draft. On gravel and MTB — where you can't always hear a bike behind you over your own breathing — the mirror is the only way to know when a rider is about to call "on your left."

In the city

Commuters use the glance for three things: pulling away from a light, choosing a lane line, and watching the bus or taxi closing on your shoulder. None of these need a head-turn. All of them are safer with one fewer.