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Yeah, I did about 2500ish miles with the 16% rings. I've mostly been riding the Brompton lately, with round ring. Going from that to 16% oval there's a really noticeable feeling of the foot 'sliding' over the top of the pedal stroke. Also this effect is noticeable when climbing seated.
Going from Brompton to 4% oval the difference is much less apparent. I'll need to do more miles on them I think (but thus far I've been very lazy over xmas). There's still a hint of that sliding sensation and generally I think the 4% made the same gearing feel higher/harder than previously with the 16%.
But you had experienced the 16% ones right? Do you feel much difference?