I am trying to compare frame geometry of a couple of frames using CAD

however when I try to input the geometry of a Spesh Epic 29er Medium I am getting some odd shapes

here is the manual pic

here is the manual geometry

but when I enter all this I am getting the BB (datum point) above the wheel axles (wheels are to scale):

http://www.bikecad.ca/

?

331 is from where the wheels touch the ground, not a random hovering point?

331 is from where the wheels touch the ground, not a random hovering point?

yep thanks, however the drawing is fully constrained as it is,

Spesh diagram implies the fork is dead straight with no rake, i have removed this and put the wheel forward based on the wheelbase geom, seems okay now