Saw this on YouTube ... Interesting option ... don't know cost.
Had generated a significant amount of interest, almost 1.7million views since April of this year.
Why stop at 90?Really didn't want to go trike as I got older, and this just might be the answer. At 73 and suffering from effects of life's adventures, it is something to think about. Goal to ride until 90 looks even more attainable.