No tape handy at the moment. However, I just went and looked at mine. My 16" Tall Tines riser looks to be the same as my 17" Schafer as they both taper into the limb at very close to the same distance above the shelf. However, they are not cut on the same radius, therefore the Schafer allows a longer narrow sight window for a greater length [ if that makes sence??]
My 19" riser on my 3 pc Silver Ghost [ by Paul] has a considerably longer sight window than either of the previously mentioned ones...
However, since I "cant the bow" when shooting they all work equally well for me.
Do not let appearance's decieve you.. The Tall Tines has a wonderful grip and does not seem thinker or blockier at all. I love shooting mine and the way it performs.. The Schafer may be a hair faster but its also 56# vrs. 51# on the Tall Tines.
I plan on chasing Mulies this fall with the 58" 51# TT and Grabbing the heavier 60" 56# Schafer come Elk Season. Both are wonderful bows and you won't be disappointed with either.
Gene