Hi * sorry, in the video the "sirio" trike is the second one! the number 2! ("a combination of steering and leaning (leaning of the seat).") * in that video the steering goes straight (when sitting on the bike and doing nothing) because of the fact that 1 - the seat is under the steering axle 2 - the steering axle itself is inclined I think for both of that reasons (am I right or wrong?) From that considerations my questions: how much COULD BE the steering axle? (that is the same of pivot axle) 40°? 65°? Because, unlike python where the seat is a single blok with rear frame (seat is rear frame) and there is only a point linking rear and front frame (the pivot), in my case the seat "is" front frame, and it is not so easy to find a good combination of 1 steering axle 2 inclinations of seat for the fact that here there are 2 linking from front and rear frame, and they affect the inclination of the seat, changing the trike from a city-trike to race-trike... I enclose some drafts hoping they'll help. * there are 2 square (behind the head and under the seat), it is supposed that they should be 2 silent block, in the middle of which the steering axis goes through; * the draft is not completed, anyway there is a rear frame and a front frame (the seat is part of front frame) and the couple of silent block are the (only) con