Originally Posted by
Street rider
Well, by small I mean a size 7 hat is just the super tiniest bit not snug on my head. So I'm usually skeptical of that 'one size' thing because, even though they're adjustable, They usually just don't fit quite right.
Gotcha. Just call around to some LBS or find a Performance in your area(s) and go try one on. All the Lazer helmets seem to fit the same, so even if it's a different model(like the Helium or the MTB version), you can at least get an idea of whether or not it'll fit, then you can order online if you want.
Edit: Looks like a size 7 hat is 56cm. The Lazer O2 is 53-61cm, so I'd think it's worth a shot. If it doesn't fit, just return it.