I finally found time to install and test the Sigeyi SRAM MTB AXO vs my Assioma Duos on my mountain bike and take them for a ride.
I tried them on pavement and MTB trails. I calibrated multiple times during my ride in case there was any break-in or settling needed.
The results were quite good. On pavement, pedaling most of the time but varying power a lot, the power meters agreed very close: within 0.3% average power, 1.7% NP but that is mainly due to differences in a few short power spikes.
On the trail, the numbers differ a bit more. However, this was not due to any power offset. Instead this was a short coming of the Assiomas. During my ride I had many short power bursts and short periods (1-3 sec) of not pedaling. Also lots of standing on the pedals and pumping the terrain. It’s the standing and pumping that seems to have thrown off the Assiomas. It shows power when the cadence is zero according to the Sigeyi (which also tracks with what I know I was doing). See pics below.
So, the Sigeyi AXO agrees with the Assioma Duo for steady state power and is more accurate than them for mountain bike use when you’re pumping and standing. Plus it’s about half the price and actually meant for mountain biking. That’s a great product as long as it proves durable.
