This one (znb) seems quite controllable, pivot slightly pointed to the rear, and trail ~zero or negative, and probably gigantic turning circle. http://www.youtube.com/watch?v=SGlNhdxesbc&feature=related A RWS python should retain the best features, hands-free, self-centering, low... RWS seems more difficult because of no direct control of both wheels like the FWD version by the body / legs. However, if it works, we can gain quite a few benefits - less PSI / speed, positive trail, bigger front wheel, lots of space for pivot behind the seat and even handle bar... Should I give it a try? Vi [python] Re: dennis renner * From: Dirk Bonné <dirk.bonne@xxxxxxx> * To: python@xxxxxxxxxxxxx * Date: Thu, 23 Sep 2010 07:25:52 +0200 The experiment is as follows: hold rear part vertical and turn the front part -> on a python we get seat rise. But if we hold the front part vertical, then turn the rear part, then the seat will lower on a python. On a RWS the bulk of the weight is on the front part, so leaning of the front part on turning will be small (to balance we need to shift weight). So from this assumption there would be no self centering effect on dennis bike (and the cal poly bike it would have). Dirk