[wongarsu]

In city traffic it's never save while you are moving, bike lanes are frequently intruded by parking or moving cars, or pedestrians if they are part of the sidewalk instead. And outside of bike lanes you're a car without crumple zones, not a good situation to look anywhere but the street either.

For leisure biking you obviously choose paths where it doesn't matter.

[endisneigh]

I get that, but wouldn't it be worse having stuff obscure your vision, especially at night where I assume it would be illuminated? reducing your ability to see dark things at night (assuming it works at night).

I guess I don't understand why you need to see your heart rate and speed constantly. presumably any device (bike computer or phone) could just record your position and speed and you could just look later if you cared.

[xcskier56]

Heart rate and power (in watts) are used as a measure of how hard you’re going. During intervals you’re almost always trying to target a specific heart rate zone and stay there. During long climbs, elite riders know how many watts they’re capable of making and for how long. Watts then become a way to pace yourself and avoid going too hard. Same with heart rate

[soco]

If the usage is meant in the city where as you mentioned the focus is on avoiding all kinds of obstacles, having the heart rate occupying display estate is at best meaningless and at worst dangerous.

[endisneigh]

interesting - thanks for the reply.

[mdp2021]

> having stuff obscure your vision

With the Augmented Reality headset I have, darker shades (obscuring the environment) improve the visibility of the "augmentational" displayed elements, but it is not necessary, and very probably unrequired when the information is concise (e.g heart rate value, as opposed to an essay).

> why you need to see your heart rate and speed constantly [...] record ... and ... look later

You do not get "feedback" if you check later. Real time feedback is different from "next-day analysis".