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@Object
Please bear in mind I have a missing ACL in one leg (a knackered knee) and a fully working knee on my right leg. SO I can compare both a working knee and a none working knee.
With reference to your second sentence, I am saying exactly that.
The required force required for a given gearing combined with the reduced movement in the joints meant that my knee issue in my left leg worsened and I started getting pain in my good right knee as well.
For reference, I use 165mm cranks on my fixed wheel bikes, 172.5s on my road bike and 170 or 175s on my mountain bikes.