I've been running ZTTO 9-50 cassette for 2 years now.
No major complaints.
Sure it is not as refined as Shimano, or Sram, but it is extremely light and shifting is still reliable.

Does backwards pedal calibrate this power meter?

Is the Q factor of the SPD-SL version the same as on Look, or is it wider (like Assioma Duo-shi)?

Last year I bough "Irefox 27.5 aluminium frame" on Aliexpress for my GF, size M was the only one available.
My GF is 164cm and it fits her fine, but for a smaller person, maybe you would need something smaller.
Frame cost me $135 delivered.
I used some spare parts, that were laying around my house, to build the bike, and it ended up looking really nice.
And which is most important, GF likes it a lot...

Frame is built very well, especially considering the price.
Only downside, no holes for the bottlecage... which I later solved by drilling some holes and placing rivet nuts in the downtube.
Later I also found a cheap set of 160mm cranks and that made a big difference for her comfort.

Let's goooo!

Quote from: wanted100 on February 13, 2026, 04:17:26 AM
For that you dont need to buy a pm.. just use the Strava watts/power estimation.

How can I access or check strava watts/power estimation during the ride?

Quote from: Da11as on February 13, 2026, 04:56:19 AM
I am not going into the philosophical debate how effort has to be paced or how one should train, but 10% drift in power on the same training could be a difference between blowing yourself up and making it through at exact effort. It is mandatory for power meter to be:
- reproducible in its technical error
- reliable in its ride-to-ride comparison
- able to compensate for temperature/pressure drift

If you need that kind of accuracy and repeatability for training purpose, then its time to accept that maybe this product is not for you.
Move along. 

On the other hand, you have thousands of people who are training successfully for years with one side power meters.
And it is well known that that kind of measurement/estimation has big issues when it comes to fatigue or drift in L/R power balance when under load compared to easy riding.

Maybe 5% error in measurement is not that big of a drawback as one might think.

Not everybody is using power meter for training.
You might use it just as a simple "power estimator", to help you control your efforts on longer rides.
+-5% or even +-10% is good enough for that kind of use. It is still much better than using just HR alone.
And why pay 500+$ for +-1% device, if you don't need that kind of accuracy?

I might buy it for my GFs bike. ¯\_(ツ)_/¯

It seems that power undershooting is a problem with cadence measurement.
The measured cadence is lagging noticeably on Xcadey during sprints.

Quote from: bigApple on November 27, 2025, 01:31:57 PM
After watching GP Lama's video, I did another test comparing the Xcadey to my Kickr.
What do you guys think?
The test procedure was as follows:
- Before starting, I calibrated the PM with my Garmin
- I competed in a Zwift race
- For comparison, the first 20 minutes, minutes 20 to 25 with two efforts
- After the race, a sprint 1
- Before sprint 2, I calibrated the PM again via the Garmin

What do you think of the data? Not as inconsistent as with GP Lama, but also not particularly accurate?

I would say yours if OK, no drifts after sprint consistant readings, but a bit high.
I observed the same on my unit, and also other users report that reported power values are always ~5% too high.
If you scale the power output to about 95% (in the Xcadey app) it gets really close to values reported by other power meters.
Not sure how can they get this wrong, are chinese watts different to western?
Or are they using a wrong calibration method in the factory?

Honestly not really acceptable for something that is advertised as 1% accurate.
But considering the price I can live with it.
On the other hand there are other units on the market for similar price that are more accurate.

Quote from: Shinobi_77 on November 27, 2025, 10:27:17 PM
Did anyone observe a difference in offset depending if you are in which front chain ring you aremin?

That is something I was wondering myself, but I use 1x so I can't test that.
Also it would be worth testing how much does chain alignment influence the values (ie. running on the big vs small sprocket).
But form what I was able to observe on my unit, there is hardly any difference.

I agree it is not acceptable that you need to verify the accuracy of you PM after every FW update.
Which can be a hassle if you don't have anything to compare to.

I also don't like Xcadey response, which is clearly bullshit.
My 2 year old PM has the same HW version as the one in Shanes video.
So their excuse this "only happens in a new revision" is complete BS...

Leese carbon crankset 165mm DUB, for ~$145 after coupons: https://www.aliexpress.com/item/1005008832402315.html
Elita one 3D printed saddle (Selle italia SLR copy), for ~$38 after coupons: https://www.aliexpress.com/item/1005007562893612.html
Carbon stem with spacers, for ~$44 after coupons: https://www.aliexpress.com/item/1005010070357991.html
Xcadey "random number generator" for ~250€: https://www.aliexpress.com/item/1005010254190071.html
Zrace DUB BB, I have several different models of these, and they are fine... ~$15: https://www.aliexpress.com/item/1005006290316561.html
Cheap chainrings ~$18: https://www.aliexpress.com/item/1005008343507378.html

I own Gen2 Xcadey since 2023... yes it consistently over reads about 5% compared to Assiomas... but I never noticed such drift in any of my comparisons. I did a few comparison rides in 2023 when I bought it, but the results were always quite "reliable".
Maybe the power signal is a bit more "noisy", but it does not influence averages.

For instance a few snips out of a longer (2+h) ride.
Two climbs, one in beginning and one close to the end of the ride.
There was a lot of varied terrain in between, also one short sprint close to 1000W...

I was very happy with it, considering I paid 220€ for it.
So much I ordered another one on this years 11.11 sale. ¯\_(ツ)_/¯

I guess your mileage may vary.

Yes, it is the same shape/design, but operation is a bit different between mechanical and hydraulic brake versions.

In the hydraulic version you can shift multiple gears in one push in both directions.
But the mechanical brake version is different, the thumb lever only shifts one cog at the time.

I received R9 mechanical a few weeks ago, haven't mounted them on the bike yet...

Quote from: Alex Jones on November 21, 2024, 04:59:26 PM
My guess is they kept the internals of the shifter and just changed the lever design. Probably costed too much to engineer the shifting mechanism into the mechanical mold or maybe it has some patent reason. I was so excited to see them at first thinking I could finally get Campy slam shifting with Shimano hardware on rim brakes (always wanted it ever since I used a Campy shifter). Imagine my surprise when I received them, and they would only do 1 shift into the harder gear

Maybe there is just a mechanical blockage inside the new style brake levers. Similar to what campy did in Ekar.
I almost doubt they could mount old mechanism inside the new style levers, because the position of the downshift lever is completely different in new vs old.

But if it is the same style thumb shifter as Hydro R9/RX why could you not shift multiple gears at once as Alex Jones mentioned?