Originally posted by PlacidityUm, yes.
Um no, its the level of superspeed, not how many feet you have. Flash only has two feet too.Vamps were running at blurring speeds, Werewolves should not be able to keep up.
The wolves were given a level of superspeed by the writer of the series and the reason they can keep up with vamps is because they have four legs. It should be noted that Victoria and Edward are both faster than werewolves... it's a case by case situation. But in most cases, the reasoning (given the by the author) that werewolves can keep up with vamps while running, is because of the 2-to-1 leg advantage.
Your Flash example does not correlate because the reason he's fast is completely different than why Twilight characters are fast... however, if Wally West did have four legs, he'd be even faster; this is science, not my opinion... Put Usain Bolt against a cheetah and the cheetah is gonna smoke Usain.
Four legs > two... i dunno how you can dispute this. Even if you can dispute it, it doesn't matter because the author of the book says this is the reason.