looking at the website, it looks like "locking" is an option (more money!). :yikes:
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Here is a four wheel tilting motorcycle
Attachment 24754
Honda has a concept Neo Wing tilting motorcycle.
Attachment 24760Attachment 24761
This is one more.
Attachment 24762
Honda made a moped in the mid to late 80s that had the lean and two wheels up front was interesting and very motorcycle like to ride