I use my mtn.bike helmet on my road bike also. I think they might have a bit longer visor. I've just gotten over sun poisoning (no fun!), and I will definitely be using sunscreen or long sleeves from now on. I'd never had sun poisoning like that (took 3 wks and itched like crazy!). In fact, can't remember when I ever had sun poisoning before. The UV's must really be getting through nowadays. Sunblock does work-I will use an SPF 45 if I plan on being out long now.