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  • Lezyne HR Flow Sensor
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LezyneHR Flow Sensor

Item # LED005V

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  • Black, One Size ($44.99)
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Item # LED005V

Keep it kosher.

If you've got one of Lezyne's comically feature-laden GPS units (which, if you don't, you should probably ditch the overpriced video game console on your bar mount and pick one up), then you're probably in the market for a heart rate monitor. Keep it all kosher with Lezyne's own HR Flow Sensor, a Bluetooth-enable monitor that lets you examine the minutiae of your ticker when the pressure's on. The HR Flow Sensor works with any head unit that speaks Bluetooth, and an LED indicator keeps you abreast of the power situation in the replaceable battery.

  • A heart rate monitor for the examined training life
  • Synchs with any Bluetooth-compatible head unit
  • Flexible strap for secure comfort
  • LED power level indicator and replaceable battery
Tech Specs
Tech Specs
Heart Rate Monitor
yes, Bluetooth
Battery Type
Low Battery Indicator
yes, LED
Mount Type
Recommended Use
Manufacturer Warranty
1 year

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Eats batteries like Tic-Tacs

  • Familiarity: I've put it through the wringer
  • Fit: True to size

Not sure what trash can Lezyne pulled this design out of, but they should put it back in. Consistently pairs about 50% of the time. And never pairs quickly. Oh and it goes through a battery in two or three rides. Awful. The end.

Worst HR transmitter

  • Familiarity: I've put it through the wringer
  • Fit: True to size

I went through 3 of these in relatively short order. Turns out that the unit keeps transmitting even after you take it off. That means the battery dies in practically no time. When I went to replace the battery, the very thin tabs that hold the battery cover in place broke. Lezyne sent a new battery cover. I also learned from the Lezyne rep that I had unsnap the unit from the chest strap in order for it not to transmit, therefore saving the battery. Never had to do this with any other unit.
This worked until the whole unit died. Got a replacement. It too died within a year.

Skip it, dies within a year.

  • Familiarity: I've put it through the wringer
  • Fit: True to size
  • Size Bought: n/a

I've had two. The first one died after 11 months, Competitive cyclist replaced it under warranty, but then so did the second. It's a piece of junk, sadly.

Firmly in the DO NOT BUY Category

  • Familiarity: I've put it through the wringer

I have gone through two of these since March 2018 - one that came with my Lezyne GPS bundle, and another that Lezyne sent on warranty after the first one failed totally in four months. The second one didn't last a month. That is just straight-up ridiculous - prior to this, I had a Nashbar Tempo unit I paid $40 for.. in 2003. Lasted 14 hot, sweaty summers until the head unit died. All those years, I may have burned 5-6 batteries. This one ate about 10-15... easy to lose count.

To add to it, their speed sensor just took a dump, too. That's why I'm here right now... buying (non-Lezyne) replacements.

All the GPS and sensor folks need to study some of the old tech for its durability. None of them have any excuse for products that last 6, 9, or 12 months like I commonly see reported for all brands. That said, the Lezyne takes the cake for the worst.

It works

  • Familiarity: I've put it through the wringer

Lezyne makes a really compelling value proposition, but I've been fairly underwhelmed with their stuff. I use a few different computers in conjunction, and I have a Super GPS that's given me problems for a while. The features and durability are awesome, but this is my second HR monitor in a year... hopefully new versions will bring more longevity!