I don't know that I would say it's definitely spam, but it is kind of suspect, for the reasons SadieKate mentioned. And if the link is legit, jeez why can't the poster just come out and say something like "You might want to check out my friend's cool and helpful website"?

All right so maybe I'm just grouchy today because the weather's gorgeous and I'm at work instead of out riding my bike.

The Halloween costumes for bikes is an intriguing idea, though. Hmmm.....