I’m considering on buying a Timewear sensor, but wanted to know is worth it or not?
I assume you mean TymeWear VitalPro?
I have been using the sensor for 5-6 months. The sensor works fine and give you some extra insights. I mostly use it to make sure the target intensity for my VT1 and VT2 rides are right below the threshold. I also use it for my VO2Max to see how many reps it takes before I reach peak minute volume.
you get three new measurements: breathing rate (BR), tidal volume (VT), and minute volume (VE).
VE = BR x VT
Most of the time you will be monitoring the VE. You basically look at the stability of VE. If the drift it too high you over threshold.
VE typically responds much faster than HR to a change in intensity.
Let me know if you want me to share some examples from some of my workouts.
how close or accurate was your VT1 and Vt2 against Xert LTP and TP?
Good question. I haven’t really tried to keep my Xert values up to date lately, but according to Xert my current numbers are TP = 307 W and LTP = 271 W.
From my own testing with TymeWear, I have VT2 at 290 W and VT1 at 205 W. My TP might be reasonably close to VT2, but an LTP of 271 W seems clearly too high—it’s not consistent with a VT1 at 205 W. Most likely, the Xert values could be improved with a proper breakthrough workout.
Like all purely power-based models, Xert relies on efforts to failure, which means there is always a psychological component involved.
With physiological testing (lactate, breathing, SmO₂, etc.), that factor is largely removed. Thresholds are determined from objective measurements, without the need to push to complete exhaustion—this also makes sense, as a threshold is by definition a steady-state condition where production and clearance are in balance. In practice, thresholds are often set too high, which leads to a gradual accumulation of lactate (and increasing physiological strain) across intervals rather than a true steady state.
Below is a VT2 3×26 min workout I completed. You can see that VE and BR (respiration) stabilize at the same level in each interval, which suggests that I’m operating right at (or just below) VT2.
I also use a few additional sensors that you might find interesting: Moxy for SmO₂ and tHb, CORE 2 for core temperature, skin temperature, and heat strain, and RuuviTag for room temperature and humidity. That said, it’s probably a bit overkill 
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I’ve had the strap now for a month and find it useful, especially for easy endurance rides that make up most of my riding. I use Magic buckets for high intensity days to fill the intensity buckets and then revert back to the Tymewear field while filling the low bucket. My VT1/LT1 and VT2/TP were pretty close both heart rate and power wise. I do need to do another test as my boundary between Endurance and top of VT1 is only 5 points (Vol/min) so not very useable. Tymewear will apparently, be giving you up-to-date metrics per ride like XERT does so no real need to take a test every 6 weeks.
The test result was interesting in that it confirmed that my Endurance (65% of VO2 max) and VT1 (81% of VO2 max) were really good as was my VT2/TP, (91% of my VO2 max) but I needed to work on my VO2 to allow the others to grow.
But the main thing to realise is that it is that Tymewear is early on its journey, so there will be lots more development and features, just as XERT has one the past decade.
Do i need their subscription in order to have all the features and benefits?
You have a free subscription the first year. I do not really use the app. I analyze my data in Intervals.ICU and ChatGPT (basically it evaluates the intervals in Python for me).