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How can you hear cars approaching over wind noise?

As I transition from a Sunday rider to a commuter I've gotten a good deal faster. This increases the wind noise in my ears, and it's gotten to the point were an unexpected car was surprisingly close as I glanced back prepping for a turn and I wobbled.

At low speeds I used my ears for a general sense of what is around me, is that expected to become unreliable at better speeds?

  • Numbers please. I.e. what speeds are we talking about? – Chris H May 5 '17 at 20:32
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    A lot has to do with your helmet, whether you wear glasses or goggles, etc. (And of course those ear buds can be a problem as well.) But as a general rule you can't count on hearing cars behind you at "road speed". – Daniel R Hicks May 5 '17 at 20:33
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    I live in the midwest, and with wind speeds you often can't hear cars so you need to turn back and look or use a mirror. Hybrids and electric cars are becoming more common, and they're pretty quiet -- you might not hear them creeping even at low speeds. – Batman May 5 '17 at 20:37
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    I was probably going 20 mph in still air. – user30065 May 5 '17 at 21:04
  • At 20mph in still air something is odd. Maybe your helmet is particularly noisy, or the car particularly quiet. – Chris H May 6 '17 at 16:07
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The stock advice is to put zero reliance on your ears ever. There's this issue, there's the related issue of wind direction keeping you from hearing a car even not at high speeds, and there are extremely quiet cars. Basically the choice is look back a lot and get good at it or use a mirror.

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  • Yeah, if you spend any time at all on the road you should have a mirror. I find helmet mirrors work best, but it's a personal thing. – Daniel R Hicks May 5 '17 at 20:34
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In short, you can't.

I find turning my head to the side a bit reduces the noise a bit in one ear, but you can't do this all the time.

A rear view cycle mirror may help you.

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I once met a chap who had attached long fuzzy fur to the part of his helmet strap that went just in front of his ears. He claimed that it reduced wind noise considerably, same theory as the really fury boom microphones they use in windy conditions. I have no experience, but it seemed to work for him.

I concur with Nathan, don't rely on your hearing for cars, ensure you can see what's coming up from behind and very importantly, make sure you as as visible as humanly possible from all directions.

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There are times you can and times you can't. I've got a regular descent at around 50km/h, which seems to be a bit of a transition. The typical car speed there is 60-70km/h. Cars coming downhill don't make as much engine noise as on the flat, and small new vehicles are inaudible there. It's not all engine noise of course. I've heard a Tesla coming up behind from the wheel noise alone. When you're behind a very noisy vehicle it drowns or other vehicle noises. In fact the last time a car hit me I would have heard it coming had it not been for a very loud train nearby (wing mirror hit my arm as I lifted my hand off the bars to signal. The mirror broke; I didn't). So you can't rely completely on your ears. But they're still very useful (I say this as someone who has and uses a mirror on my main bikes).

Generally speaking you can hear when the closing speed is significant. When you're going slowly you can hear cars at any speed. When you're going reasonably fast you can hear fast cars, but of course you don't get much warning before they catch you up. What's really useful is that you can hear the change of gear and revs before someone pulls out to overtake. At typical urban speeds you can also get quite a lot of information about speed and position of following vehicles.

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