I was wondering how aero helmets tend to fit. I've been looking at getting a used one. My head size is 58.5 cm, and the medium helmets usually run 55-59 cm. Would I be too tight if I went with a medium? Would it be okay to just go with a larger size, or would it be too big?
I have a big nogg'n and my to helmets prior made me look like an alien; when I picked up the Ballista, I tried to fit the Medium instead of the Large as I wanted as sleek a profile as I could get considering said head size. With a balaclava and the helmet I am firmly snug in there near max on the adjustment dial. Try them on and fit the smallest you can fit would be my suggestion
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This article estimates how much time can be saved in sprint races by converting from stock aero wheels found on most tri bikes to more aero disk and composite spoked wheels.