Quarq TyreWiz Air Pressure Sensor for Presta Valve, Pair

Works perfectly. It's a bit of a uneeded extra, but I do like getting my bike ready to ride, flipping on my iPhone and checking tire pressure, easy peasy. While switching to tubeless it let me easily monitor my tire pressure without having to pull a pump out every time I wanted to check. I could stream it to my bike computer, but that seems like overkill for me - more important data to concern myself with - but I do like being able to access the data via my iPhone.

Riding for long backpacking trips riding over rocks, sticks, and road debris that unable to avoid leaves doubt whether I’ve punctured with my tubeless set up. I greatly enjoyed the knowledge of being able to look at my head unit and instantly know whether I’ve punctured or have a slow leak. Also great for multiple day trip, instantly knowing whether I need to top off my tires.Now the bad news. Just after the 90 day warranty was a big trip from central Kansas to Texas and back. One of the sensors developed an air leak on the side of the unit. Not sure it was my error in over tightening the unit or a product defect. In hindsight, I think it best to install prior to mounting the tire to get the best alignment.Because I enjoyed the product, im going to buy a replacement and see if it was a one off defect.

Easy to install. Connects every time without issue to my Wahoo computer. You can assign to front or rear and have both fields show on the Wahoo. Its nice to have the info available at a quick glance.

Each time I use these, when I go to the app, I have to select the sensor and then determine which one is the front and which one is the rear and then it will show them in the right place in the app (like connecting to a bluetooth device every single time you go to the app). I feel like this should happen automatically so that I don't have to keep doing it manually. Maybe I'm missing something but 4 stars till they fix this issue.

I bought these 6 months ago and one of them is already toast (won't power on). I liked the idea of being able to inflate my tires to an exact pressure and then be able to monitor the pressure from my Garmin head unit. The connection to the Garmin was surprisingly solid but here are the main problems with these units:-durability/longevity: as mentioned, I've had these for 6 months and one of them is dead, even after swapping out the battery to a fresh cell-LEAKING: this is the second biggest issue; in my opinion, these sensors cause the problem they were created to solve. after just 3 hours they would have lost 10-15 psi on my road bike. between rides the total loss of pressure could be upwards of 30 psi. I tried these sensors on a traditional tube/tire set up as well as tubeless (Specialized RapidAir) with the same problem. I've also tried using teflon tape on all threaded interfaces. no matter what I tried, i got the same result-awkward shape/size: I used these almost exclusively on a pair of Roval CLX64 wheels and the battery compartment would rub on the spokes on the rear wheel to the point where I had to shift the sensor about 20 degrees just so it wasn't rubbing. these sensors are designed to be aerodynamic so it was unfortunate to have to shift it to a position that wasn't very dynamic. I tried different valve stem lengths to get the sensor as close to the rim as possible but it didn't solve the issue.When the sensors were working they "worked" great in the sense that the data connection was never really an issue. The Garmin Connect IQ app worked really well and there was no lag, even when pumping up the tires. the problem was the constant leaking. I wanted to use these to dial in a specific pressure but I also wanted to monitor my tire pressure during rides so I could spot slow leaks before they became a big problem, especially when descending. I will probably buy the next version of these once the leaking is addressed and the footprint of the battery/sensor housing is fixed (could you design something that wraps around or clips onto the next nearest spoke?). maybe there's a design where the battery and transmitter body simply slides off the valve stem and is rechargeable; and the valve stem itself is where the sensor is (sealed for no leaks). I would also like to see Quarq sell tubeless valve stems that are compatible with these sensors and with all major rim profiles and depths (having the stems available in 5mm increments would be awesome). I spent too much time online (eBay) trying to find a valve stem for my CLX64s that would barely protrude out of the rim so I could attach the sensor stem/body as close to the rim as possible.

One already had a dead battery after three months of service. I think they are staying ON while the bike is in transport on my vehicle. They do work very well, had a puncture and watched my pressure drop down to 2psig (fat tire bike) before I got off and walked.

If you're a data geek like me, these are kinda fun.. but... You can get your air pressure anytime without hooking up a pump and you can even view your air pressure over the course of your ride against both ambient temp and altitude in the SRAM app. My Garmin 830 shows me the air pressure (although no alert if it drops.) But, it's really TMI (too much information) even for a data geek. The TyreWiz work ok, although I had to change both batteries within 6 weeks (and by the way - the manual says use no tools to turn the battery compartment - good luck with that.. after breaking two fingernails I used the tip of a blunt screwdriver and a cloth to turn this lid... ) So.. if you like pressure data, and you have an extra $200 to put in your bike, go for it. I think they're ok but not the most valuable add-on I made for my bike. Sometimes it's just better to squeeze your tires before your ride and make the call that way if they need air or not...

But then again my Garmin fenix takes some time to get a signal from other devices too. I might have too many devices hooked up. If I make sure it's close enough and give it time to sync before starting it will take good data the rest of the trip and record the whole thing. Amazing how precise it is, as it looks like it goes up and down with temperature changes, as expected under the ideal gas law. Maybe work with garmin to ensure they can keep trying to read from it even if it's not seeing it yet at first.

Easy to install, does what it should.