I’ve been running Assiom Duo Shi for about 2.5 years. For the first 2 years or so, I was using Shimano SPD pedal bodies and consistently had roughly 53% L/47% R. I swapped to SPD-SL in February of this year, and had a similar L/R balance and it was even trending closer to 51% L/49% R after a bike fit with shorter cranks to deal with some hip impingment.
I put the SPD cleats back on a few weeks ago for a few gravel events and now I’m consistently showing much higher power on the right side and my overall ride power is trending lower (which could be fatigue maybe or reading low on my historically stronger left leg ). Screenshots below are from the same local road route and same RPE (July ride +20w).
Has anyone encountered something similar? Any tips are appreciated!
What was it before? I’m not worried about 50/50, more concerned that left leg has always been stronger and now the left power seems way low.
My left leg always read higher on Assiomas and my prior 4iiii left side PM only always read high vs Kickr (which makes sense if doubling power from the stronger leg).
Can you share your talk effectiveness and pedal smoothness stats too? I’ve found them useful to diagnose faulty pedals in the past… if the stats from your left pedal are lower than the right then it could indicate you are experiencing intermittent dropouts from that sensor.
I dont own the “Shi” version thoiugh - cant comment on any accuracy issues relating to fitting SPD pedal - technically not officially supported by favero.
Oh they may have changed it between the DUO and DUO-Shi - I dont have it on my Favaro MX pedals either but thought that was because it had full cycling dynamics…
And here’s yesterday’s ride with SPD bodies. Looking back through the past few weeks with this set up, it looks like the left power phase is consistently earlier in the pedal stroke (chart looks rotated counter clockwise)
I appreciate your help with this stuff! Not sure what to make of these. Rides were all on the same bike, just different shoes but got shorter cranks in Feb this year (175mm→170mm)
@FrankTuna is the stack height the same between the two pedal bodies? Did you adjust your saddle height accordingly? If not, then this change may be the result of the change in distance from saddle to pedals.
You’re also comparing rides with different crank lengths, which is probably contributing in some way, too.
While it does look like a big change, I wouldn’t worry about it too much.
I can’t remember if you typically focus on lifting legs during the off season, but if you do then recommend adding in some single leg work to force your body to even out leg strength. I (generally) follow the FasCat 10-Week Weight Lifting Program but do everything single-leg. It’s taken a while but I’ve seen my L/R balance trend more evenly by a couple of % points.
Good points…I’ll have to check the stack height but the seat hasn’t moved. Strength work is on the agenda for the off season but single leg stuff has me nervous because I’m not terribly coordinated
My rides earlier this year though with the shorter cranks and road pedals had similar L/R numbers as last year’s rides with slightly longer cranks/SPD’s. Seems like everything went out of whack when moving back to SPD’s a few weeks ago.
I’m going to check the pedals vs my Kickr today. They typically aligned well before, so if they’re still reasonably close I’ll take @kevistraining ‘s advice and just try and forget about it
@FrankTuna other considerations include PCO (pedal center offset) and q factor. Did you use the same shoes such that you swapped cleats? If so then another variable is how wide (or narrow) your foot spacing changed from one setup to another.
Tested against my Kickr Core today and the Assiomas were way low. They always used to line up really well with my Kickr I’m out of warranty too (even if I didn’t tell them about the SPD bodies )
Assiomas are ~10% low at Z2, ~6% at threshold, and ~15% lower in the 30 second sprints.
I could scale the left pedal so the total power lines up with the Kickr and that would get me to 51%L/49%R but then I would never really trust any PBs.
). Screenshots below are from the same local road route and same RPE (July ride +20w).
I’m out of warranty too (even if I didn’t tell them about the SPD bodies 
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