Assioma on Road Bike / Look keo on trainer

i have a specialised roubiax for the road and a tacx neo bike for all my indoors stuff. The only measurement that i cannot replicate on the neo bike is the crank length so i equate for that with shorting the saddle height slightly.

Cleats are the ones that came with my Assimoas (Expedio i think they are called)

Road bike pedals are Assioma
Trainer: Tried 2 pairs of Look Keo Classics - currently installed are:

When I’m on my road bike, i don’t feel any resistance towards the outside of my right foot, and my foot feels like all is in contact with pedal.

On my trainer, I can feel a resistance against the outside of my foot like when your unclipping, and there is a bias towards the outside of my foot being used to push down. I have to actively think about pushing my big toe down to engage that part of my foot.

The q factor of the pedals is the same, they both even have a 2mm spacer in there from a bike fit. What else could be at play here? I am coming back from pretty much the entire of 2023 being a disaster from constantly issues with my right side and this is playing on my mind aswell.

What pedals do others use who have assioma on their primary bike?

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This is the float on the trainer pedals.

Why not put your Assimoa pedals on the trainer? Its a 30 second swap. Its what I do with mine all the time. Appreciate you still have the crank length issue but this may help?


I would do this because that’s the whole idea of pedal based PM but if that is still too much work, did you check spring tension of the pedal?. Or maybe the left cleat is more worn, my left cleat always wears out much faster than the right one

Is the Q-Factor of the bikes definitely the same too?

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Have you at least tried this for the sake of comparison? If you don’t have the same issue when the Assiomas are on the indoor bike then you can always get the Xpedo dumb version of them - this is the pedal body that Favero uses: THRUST NXL – XPEDO

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It’s always a good idea any to once in a while take off your pedals and apply new grease so they don’t become stuck

I use assioma and look keo classics without issue - they do feel a little different to clip in and out of but I don’t notice a difference when I’m pedaling.

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I hadnt done this as the bikes live in different places, but I’ll give it a go for comparison.

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Thanks for the reply - how do i check the q factor of the bikes? looking on the Tacx Neo bike dimensions I can see a q factor of 147mm

But i cannot find a q factor for my specialized Roubaix. But can find a q factor of the 105 groupset which is 148. would that be the same?

Yep Q is determined by the crankset plus the pedals (plus cleat positioning on your shoes if you want to get really technical).

So the Tacx bike has one listed because its crankset is proprietary (and I assume you can’t easily swap it for a 3rd party option).

Roubaix doesn’t have one listed because you can put about a hundred different cranks in it and each of them could have a different Q factor. 105 cranks at 148 is your number here.

So in this case it’s not a huge difference, but I just double checked pedal specs and looks like the Assiomas are 54mm while the pedals you linked in the first post are 53mm. Crank/bike specs are total width but pedal specs are per side, so now you’re talking about being 3mm narrower indoors than out, or 1.5mm per side. That means your indoor bike is closer to your pre-bikefit width (before you added the 2mm spacers each side) than it is to your current outdoor setup.

I think for most of us 1.5mm probably wouldn’t be noticeable when pedalling, but if you’re sensitive to it or you’re already on the limits of your ‘ideal’ range of fit measurements then it’s the kind of thing that can make the difference between getting foot hotspots or stabilising muscle aches or not after a few hours.

Based on your video it does look like there’s a separate issue to do with cleat interface and that appears more significant. Once you try the Assiomas on the indoor bike you’ll be able to answer that question at least. But the 3mm width difference could be contributing as well. Hope that helps!

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