MMWR/Tutuloo W100 Radar Review: A Positive Surprise?

MMWR W100 radar review: W100 radar attached to my Canyon Endurance AL.

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Cycling radars such as the Garmin Varia, Bryton Gardia, and Magene L508 are very popular due to their usefulness.

So it’s no wonder this product category attracts other manufacturers who want the slice of the pie – even those you’ve never heard of.

One such company contacted me to see if I would be interested in selling their radars. I respectfully explained to them that I don’t sell products, but I am open to review. A few days later, their radar from China was at my desk.

So in this review of the MMWR W100, you will learn about my experience.

In short: My most intense emotion is a surprise. Find out below whether it was positive or negative.

NOTE: I wrote this review before the radar was launched on Amazon, where it’s now listed as the Tutuloo W100.

MMWR W100 Summary

The MMWR W100 is a bicycle radar inspired by Garmin, Magene, and Bryton ones.

It’s sold on Alibaba for around $60. There’s a catch, though. You have to order at least 10 of them.

I honestly couldn’t find this radar on Aliexpress either. So it’s very difficult to get at the moment.

MMWR Radar Setup

After delivering the radar, I made a short unboxing video with first impressions:

I then tried to pair it with the MMWR app for iOS. This went without any problems.

The app has an outdated design and only basic features: bike computer simulation and the ability to change light modes. It works most of the time but tends to freeze, so you have to close it and open it again.

Pairing with Garmin and Wahoo bike computers was also seamless. However, after a while, I noticed that the radar tends to disconnect and reconnect from the Garmin.

MMWR W100 Technical Specifications

  • Dimensions: 41.5×100×21mm
  • Weight: 83g (w/o mount), 175g (with mount)
  • Claimed battery life: Solid 14 hours, flash 18 hours, radar only
  • Real battery life: will be updated
  • Charging: USB-C
  • Radar: Yes
  • Taillight: Yes
  • Brake sensing: No
  • Auto standby: No
  • Lumens: n/a
  • Light modes: Solid, flash, radar only
  • Water resistance: IPX6
  • Viewing angle: 220°
  • Horizontal angle: 40°
  • Protocols: ANT+, Bluetooth

My Experience with MMWR W100

I used W100 for about a week. I found the following pros and cons.

W100 Radar Pros

  • Increased sense of safety
  • Long battery life
  • USB-C charging
  • The radar itself gives sound alerts

W100 Radar Cons

  • Unreliable (false positives and false negatives)
  • Terrible mount (heavy, bulky, incompatible with aero seatposts)
  • Hard to press the turn-on button
  • Radar’s sound alerts cannot be turned off

Among the first surprises were the sound warnings – whether it was information about turning on the radar, changing the light mode, or alerts about approaching cars.

Honestly, I’m not a big fan of them. On the other hand, they allow people without a bike computer to use the radar. They can rely on audio cues instead of visualizing them on a screen. It’s just a shame that they can’t be turned off.

Another controversial thing is the mount. Almost immediately after receiving the radar, I contacted the manufacturer with my initial impressions and criticized it. MMWR went down this path to avoid patent infringement. However, they told me the next generation of their radar should have a better mount.

As for reliability, the W100 initially pleasantly surprised me. It tracked cars accurately. I even had the feeling that when aiming at a busy highway, it tracked multiple vehicles better than, for example, the Magene L508 or Bryton Gardia R300.

But, it gave me many false positives. The signals reflected from cars driving from the other direction. This was not good.

Unfortunately, during one ride, it missed two motorbikes (false negative). That reason alone is a reason to avoid buying this radar.

The claimed battery life of 18 hours in flash mode seemed quite high to me. But due to the critical errors in product reliability, I decided to stop using it.

The radar offers several light modes. They are confusing – I don’t understand why anyone would want to use this product just as a taillight without the radar.

You can switch between the modes in the mobile app or with the power button. The button is difficult to press, and it also deserves a redesign.

To summarize, MMWR W100 performs well in its basic function, which is tracking traffic behind you. Unfortunately, it is evident that the development process was rushed, and the product didn’t receive the care it deserved.

Things to Consider Before Buying MMWR W100 (or Any Other Bike Radar)

If you buy a device like a cycling radar, you should have zero tolerance for false negatives. But you also shouldn’t 100% rely on cycling radars and use your other senses while riding.

Based on my testing, W100 proved to be unreliable. It gave many false positives and even a few false negatives (e.g. when overtaken by a motorbike).



I did not have high expectations from the W100 radar because of its low price. After unboxing it, I was unpleasantly surprised by the mount, which is large, heavy, and not compatible with aero seatposts. On the other hand, it is quite sturdy.

From using it for about a week, I have concluded that its reliability isn’t on par with other radars on the market. It had given many false positives and even missed several motorbikes.

The product feels rushed and unfinished. So, despite its low price, I would wait for the next generation that should have many of its problems solved.

The product for this review was kindly provided by the manufacturer. This did not influence my overall verdict or my opinion about the product.

About The Author

5 thoughts on “MMWR/Tutuloo W100 Radar Review: A Positive Surprise?”

  1. Profile picture of Petr Minarik - the founder of

    Hi, after owning the Garmin RVR315 for a couple years, an excellent unit, the Bluetooth started failing, probably due to extreme Florida temperatures. This was dangerous so I replaced it with the less costly W100 because it was self contained and didn’t need a Bluetooth connection. Here’s my experience: Negatives: First, the W100 software was not compatible with my relatively new cell phone, so I didn’t use the app. I used the sound output instead. The W100 was less sensitive to cars by 100′ approximately and missed an ATV altogether. There’s a false positive at the same part of my neighborhood every time I pass a particular house. Positives:The high powered LED warning lights are very good at alerting drivers coming up behind me. The W100 works well in Florida temperatures that are over 100F. Bottom line: I’m heading back to a Garmin unit. The 100 feet makes a difference.

  2. Profile picture of Petr Minarik - the founder of

    GP Lama sent me …

    Shane just published his review of the Bryton 300 radar. They’ve updated and he had some positive things to say about it. He posted a link to buy it at Amazon US. It was sold out, but Amazon suggested the Tutuloo as an alternative. At $90 (less than half of a Varia) I was intrigued and messaged GP. He’s never heard of it but suggested your website for a review. Based upon your experience, it’s safe to say that neither of us are impressed.

    Great website – you’ve found a new fan.

    1. Profile picture of Petr Minarik - the founder of

      Hey Kevin,
      I’m thrilled that you’re finding my website helpful. Comments like yours always bring a smile to my face.
      It’s pretty neat that GP Lama remembers me from Eurobike 2023. As for “Tutuloo,” they’re in the process of working on an updated version. But this one was just not good enough.
      Regarding the Bryton R300, I actually did a review on it too. Unfortunately, I tested a demo unit with outdated firmware (which I only discovered later). The good news is that the new R300L is already on its way, so I’ll be revising my original review soon.


      1. Profile picture of Petr Minarik - the founder of

        Maybe one more thing to consider. When it comes to safety accessories like a radar or helmet, trying to save doesn’t really make sense. These things can literally save your life.
        The difference in radar prices can be offset, for instance, by not getting a new jersey or opting for a 105 cassette instead of Ultegra. You know what I mean. 🙂
        – Petr

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