Trikes in the USA have such a dowdy image, but in the UK we still have a few custom builders making lightweight high-performance trikes for racing and touring. You have to unlearn bike riding to ride a trike, but they are fun.
http://www.bikebrothers.co.uk/lt_01.htm
http://www.longstaffcycles.co.uk/lon...ard_ttrike.htm
http://www.longstaffcycles.co.uk/lon...cing_trike.htm