carkat

thank you! there's a bearing cup at the bottom of the extended head tube, yes. probably it's a good idea to check if it fits in the new tube first before cutting/welding...

hi, that's 34mm outer diameter and 2mm wall thickness!

hi, hard to say from a distance. do you have a pic of your bike? there could be a few reasons for this... e.g. if the 90 degree-angle of the pivot is not really accurate the bike leans in turns (this is used with christiania bikes so that it feels more natural to ride the bike in turns). also if you turn too far the weight gets probably shifted to one side while the effective wheelbase gets smaller (think of the points where the wheels touch the ground: with a 90 degree turn they are all in line while the weight is on one side - this can't work :-) ). if you're riding too fast the weight wants to keep on track in turns while you try to move it somewhere else, this can pull your bike over, too, as i experienced in person a few times ;-)

:-) thanks!

yeah, i guess "beast" is the best description for it. a beast in the making, and to ride :-)thanks!c

..aaand another one did it :-) joel from sweden sent a link to a documentation of his bike: http://recycle-design.blogspot.se/2016/05/slutpro...check it out!