FeretRacing Added a comment about feature Modern Mountain Bike Geometry Defined - Transition Explains Effective Top Tube Versus Reach 1/16/2015 2:08am If the reach and stack are available, you can easley calculate the "effective reach": http://www.algebra.com/calculators/geometry/pythagorean.mpl Votes: You must have JavaScript enabled to use this form. 1 Save This feature has 39 comments.