Figure on adding about 0.8 to 0.9cm (for frames in the 50-60cm range, c-c) to the toptube length for every degree that you slacken the seat tube. This will keep the relationship between the bb and stem quill about the same, and allowing you to use the same stem length if the seat position can also be made the same with whatever range of adjustment is available.
David Snyder
Auburn, CA
> My question is. What is the relationship between seat tube angle and frame
> sizing? If I normally ride 52cm with a 74 degree
> Seat tube angle would a bike with a shallower angle require a larger
> frame?
>
> Just curious. I may be selling this soon anyway to pay for another
> project.
>
> Mike "Couldn't even ride to Krispy Kreme" Wilkinson