I've been looking for a bike helmet for a while, but they're all too small. My melon measures 62cm, but it's wider than usual, and even the largest Specialized, Giro, and Bell helmets don't fit. The largest Bell I tried yesterday came the closest--it's supposed to fit 64cm. It went on rather than riding like a beanie, but it was way too tight at the temples.
I've asked other places online, and was recommended Lazer and Nutcase. The Nutcase helmets sound most promising, but there's no dealer very near to me. I'd appreciate more advice from cyclists with full-sized upper appendages. It's frustrating because I decline to do risky cycling (ie, bad weather, slippery conditions) without a helmet, and I can't find one that I can use. I want to get out there in the ice and snow, but I need skull protection.