Who is to say for sure? I have had this thing for years, long before they became popular. I guess i am not too concerned about it. From the frames I have seen they all appear to be legit. Was advised to mount engine and rear rim to determine placement of rim that acts as the sheve. It makes sense to me due to the many variations on these frames. RegardsSo given everything I've read so far there seem to be variations in every one of these bikes, scooters, sleds, etc... If that's the case whose to say every one of these is a genuine Alexander? Seems to me it would be fairly easy to replicate these. Thoughts?