>>I wonder what it is like to ride one of these bikes.
>>
>>http://www.dailymail.co.uk/sciencetech/article-2321942/The-British-engineer-really-HAS-reinvented-wheel-Loopwheels-abandons-spokes-springs.html
>
>I want one of these
>http://solowheel.com/

One fear that I'd have would be situation where it could stop suddenly (e.g. because of an obstacle, or it suddenly brakes unexpectedly)...