Originally Posted by
Peterpan1
I don't know anything about that particular bike, but I don't think the kind of thing you are finding is unusual.
I would break it down into two catagories. 1) difference between specs and frame, which is normally a good thing. 2) QC in manufacture.
Where "1" is concerned I just looked at the table, and it isn't my kind of bike so I might not spot anything, but generally the fixed parts like CS length over certain sizes do appear to be accomodated to some degree under the variable items like the HT angle. Quite often the measurements in the geometry trables are for show. But there is some plausibility here.Where 2 is concerend I would wonder how able you are to measure some of this stuff, just knowing how difficult it can be to get a level to sit on head tubes unless it is the perfect length and there isn't any paint build or head badge to get in the way. It is pretty hard to mis-saw a tube by 2mm in a production setting, so I would tend to put apparent erors down to geometry fuzz. If they are left/right problems, and there are also alignment problems then the frame may have problems. Factory frames aren't built like custom frames though.
You're right about the difficulty in measuring a bike, but some measurements can be done pretty accurately by using a plumb bob, level and tape measure once the bike is secured in a vertical/square position. Other measurements, like the top tube and seat tube (c-c) cannot be measured accurately.
When I enter all the measurements I am confident about into BikeCAD and use the published specs for the rest of the measurements (that I can't take myself), that's when it becomes apparent that there is a problem. Something isn't right and like you say, usually it's something like a tube angle that has to move to make it work.