Storck Frame Geometry

We are often asked about how exactly our frame geometry is measured. Storck builds racing bikes with both traditional ("Italian") geometry as well as with sloping (also known as compact) geometry. Our carbon fiber racing bike frames as well as the Vision Light feature sloping geometry. The top tube slopes slightly downwards towards the seat tube junction at an angle of 6 degrees.

For the top tube we give two values. Looking at the drawing, the measurement "TT", is the actual length of the top tube material itself from the junction of the top tube/seat tube to the junction of the top tube/head tube. In addition, we give a theoretical measurement of the top tube measured horizontally to the ground, in the drawing "TT EFF". "Effective Top Tube" is an especially useful indicator for mountain bike and compact/sloping racing bikes frames.

With mountain bikes, the length of the fork used (suspension travel) has a significant effect on this theoretical value. Current Storck mountain bikes are optimized for 100mm travel suspension forks. Using a fork with variable travel is no problem but it will have a slight effect on the bikes steering geometry at maximum/minimum travel settings.