~Important Note on 100×8 Version~
The 1X 100×8 version is for use with Shimano XT FC-M8100 Chainrings. In order to use this chainring on the Sigeyi power meter, you must remove the current chainring spider from the chainring. The spider is held on by 8 T15 security bolts. These security bolts require a specific hollow tip tool for removal and installation. Therefore, you need a tool such as the Sigeyi Chainring Bolt Tool for Shimano 100×8, unless you already have the same type of tool.
Please also note, even with the correct tool, these bolts can be very difficult to remove! If you purchase a new Shimano XT FC-M8100 Chainring from us, we would be happy to remove these bolts for you before your order ships.
Key Product Details
Compatibility:
This Sigeyi is compatible with Shimano MTB direct mount cranksets using a 1x chainring. This includes the M9100, MT900-1, M8100, M7100, M6100 and MT610. Regarding chainrings, it requires a 104 BCD 4-bolt MTB chainring (which is different than the direct mount chainrings found on many Shimano MTB cranksets). If you don’t already have a 104 BCD 4-bolt chainring, we offer several to choose from. See Compatibility tab for more information.
Power Measurement:
The Sigeyi power meter measures power at the spider and is therefore able to measure power from both legs.
Key Features:
Dual-leg power measurement, accurate to +/- 1.0%, 300 hours of battery life, rechargeable battery, very lightweight, left/right power balance, ANT+ and Bluetooth compatibility, auto-zero (automatic calibration). See Specs tab for more information.
Advice From Our Staff:
The Sigeyi is a great way to add power to Shimano MTB direct mount cranksets. It measures power from both legs, is accurate and affordable. In addition, since it bolts on to your existing crankset, there is no need to buy new cranks or change bottom brackets. It is also lightweight which makes it a great option for cyclists looking to minimize added weight.
Options For This Power Meter
BCD: This power meter is available in the following versions:
- 1X 104×4 (For 104×4 Chainring)
- 1X 100×8 (For Shimano Chainring)
Please see Compatibility Tab for more information on these two versions.
(949) 535-3742
matt (verified owner) –
So far so good! Can’t beat the quality for the price. Accuracy on par with all my other meters.
Power Meter City –
Hi Matt! Glad to hear you’re happy with the quality and accuracy! Thanks for choosing us and enjoy your rides.
Jim Messer (verified owner) –
This is my second Sigeyi power meter. Why did I buy another? My other bike is my fun bashing bike- and I wanted an affordable, dead on power meter. I got just that- again. I took off the 8 security bolts- which was a pain, but I was able to do it. It’s super easy to strip them, so bring your patience and don’t rush them. I got the new spider on with my 34t and on my bike it went. I charged it to 100% and paired it easily with my Garmin 840. Super happy with this meter. And of course- even more important- I am happy with power meter city. Great people to deal with.
Power Meter City –
Hi Jim, thanks for the kind words! We’re happy to hear this power meter is working well enough you’ve added to your collection. Thanks for the detailed response, we’re here if you need anything else. Happy riding!
Scott (verified owner) –
This is not a long term review since I’ve only had this a couple weeks and done a few rides with it. Overall very happy so far. I was a little skeptical not having ever heard of this company before, but after reading some credible reviews online I decided to try it out. The setup was very simple once I had the proper security torx bit and spider tool to remove the stock spider and then separate it from the chainring. FWIW, the spider tool can be had for less than $10 and I found the right torx security bit at my local Ace for $4. Accuracy was my big concern but after having done some testing of this vs my Assioma Duo pedals as well as on the Saris H3 trainer, both indicated this power meter was well within 1% of the readings from both of those other sources for any interval over 30 seconds (accuracy measurement on intervals less than 30 seconds always shows more variation across all power meters in my experience) so I haven’t even needed to adjust the power scaling on this, but I’m glad I have that option via the app in case it ever becomes necessary. That’s actually quite impressive accuracy in my experience and I’ve had quite a few power meters over the years, most quite a bit pricier than this. Its worth noting that even though this is dual sided measurement, the power balance metric accuracy has its limits because its trying to measure left side power sensing the strain registered on the spider which is on the right side: some calc adjustments are involved there. I think this makes the overall power measurement even more impressive really, but you can very quickly see where the balance calculations fall apart if you try pedaling with just one leg: the result is not 100%/0%. But as long as you’re pedaling with both legs and don’t have a balance skew worse than maybe 65/35 this thing tends to be right on point so from a practicality standpoint there’s really nothing to criticize here. I also like the design of this power meter for MTB purposes because its almost entirely out of harm’s way. And for the price, is there a better value out there? If you want power on your MTB then I would not hesitate to suggest this option. If I had to pick all over again, I’d go right back and buy this same thing.
Power Meter City –
Hi Scott, thanks for providing this valuable insight into the Sigeyi AXO Shimano MTB Power Meter! We’re glad this product has been working well for you, it’s quickly become one of our staff favorites! We’re stoked to see all the data comparison too! Enjoy the riding!