 In comparing them, it is the range of adjustment of their "comfort points" that need considered, and because the matter is largely subjective, giving it proper attention is difficult to do.The range of fore-aft adjustment for double-rail saddles rarely exceeds an inch or so, but advertisers claim that I-beam saddle designs can give up to 200% more adjustment range than some of these.When the fore-aft adjustment range of the saddle needs "further" extension than the clamp affords, it may be possible to add a "saddle adjuster".