Wind.

[Jenn]

I'll fight a headwind up to 25-30 mph, but I hate crosswinds!! Both are a struggle; to keep pedaling, to keep your bike straight, to mentally not give up. Headwinds are simply a struggle of wind against pedaling power to keep one moving. Crosswinds test your control of the bike, your stereing, your balance, your strength, your reaction time. Much more challenging, IMO.

Annie

Talk about crosswinds, I had a few hit me this morning that I thought it was going to take the bike right out from under me, didn't like it much.