I've tried them. They are fast. Too bad only in the 406 and 349 sizes. I am in the process of doing some roll-down testing on them but it is such a pain to swap tires out quick enough that environmental factors don't affect the consistency of the results and I don't have a spare set of rims to use either.
I edited my post as I made a typo. I mean to write 349. That was the standard tire size for many of the Greenspeed trikes and same size as the Brompton and Merc.
Last edited by Wavshrdr; 06-25-06 at 08:30 AM.