i agree a lot of it is anecdotal evidence , but have a google of bipoace rings and they are very marmite , with the marmite haters citing knee problems .
seems they work well for some but not for others.
I dont think that biopace didnt take off for the big S because of some nasty urban myth either, it was a failed design
again anecdotally speaking, but my knee's arent great, the only chainset i remember problems with was a biopace , but then it was also a 200gs. i also used to push bigger gears at a lower cadence . now i spin quicker in lower gears and dont have the problems
I went through a period of knee problems - and truth be told, didn't really suffer the symptoms directly from periods of being in the saddle.
I've lifted weights since forever, and have always looked after my knees from that perspective, but strongly believe full squats are helpful for knee health (given work on technique). My knee issues seemed to coincide with perhaps my most active in terms of gym usage, plus my most active in terms of off-roading and hill climbing.
Perhaps BITD, being relatively strong in the leg department, meant I was inclined to push bigger gears than I really should, I'm not sure, but I do know this - once I focused on cadence and being more inclined to spin a bit faster than lug a higher gear, the problem largely went away.
I have used biopace BITD, and one of my current bikes has biopace rings, and although I don't tend to do much miles these days, and little hill climbing, I don't tend to feel anything I'm directly connecting to them. Any minor niggles I have with my knees, these days, is normally one of those biological tells that I should focus more on certain lifts to keep my legs at their fighting strength.
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