Join Date: Sep 2008
Bikes: Baum Romano, Colossi xCr, Homemade Bamboo!
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I've got a moderately big head and I'm in a Large size Giro helmet with room to spare. Giro Atmos is a bit pricey though, but presume that their sizing is standard across the range.
My head doesn't sound quite as big as yours though. 'One size fits all' cap are a struggle, but I'll get an adjustable cap on in the last 1/3 of the adjustment.