I know it's a hot topic, and I sit (sat) on the fence about helmet wearing ( I'm actually led on the couch, unable to walk :oops: )
I wear one, maily because my wife goes mad if I don't
, 90% of the time, always for my commute and club rides / training rides, but not for leisure rides.
I went out Weds for a 50 miler on the flat (part of route 91 in west lancs), and as I was only going to take it easy wasn't going to bother with a lid. It started to rain, so I put it on, mainly to keep my head dry!
20 miles in, I was riding non-handed eating, and got hit by a crosswind, and went over the bars at 16 mph, landing on my head and elbow. I was briefly knocked out, but managed to get to the side of the road, gather my thoughts, and get back on the bike after 5 mins. I made it home under my own steam (10 miles), whinging and moaning like a girl (sorry girls!) Luckily the bike only suffered a scuffed saddle an bar tape.
Without my helmet I would have been in a lot of trouble. I hit the ground hard with my head, hard enough to have suffered a serious injury without my helmet. As it stands I am resonably ok..... I've spent 24 hrs in hosptal due to a large (melon sized) Haematoma on my hip. Without the lid I'd still be on a ward.
I won't be riding again without a helmet. The only reasons not to are vanity / overheating / laziness, which in now way outweigh the pros.