Ultracortex
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Head size
I noticed the STLs come in 3 different sizes (small, medium, and large). What head sizes are they meant for?
The frames correspond with these approximate head circumferences: Small = 50-55cm Medium = 55-60cm Large - 60-65cm
The adjustment bolts create significant overlap between size ranges, so that the actual ranges overlap by 50%. A large headset fully adjusted inward (smaller) is approximately equivalent to a small headset adjusted outward (larger). A medium frame can fit an adult male about 90% of the time. Most women can wear an adjusted medium, but a small is usually a better fit.