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croft
I don't quite understand the dynamics of the teeth during the pedal stroke, but on my XL Q rings the difference in height between top and bottom is massive, which means setting up the FD is a pain and the chance of the chain coming off if you shift whilst going over really rough tarmac is much higher.
In a word, faff. But if I was being supported by a team of world-class mechanics then I wouldn't expect to be having to pull over for a bike change caused solely by oval rings during the most important 3 weeks of my career. We'll never probably find out what the real problem was.