What are the choices in frame inset?

What are the choices in frame inset?

The QUICKIE Nitrum offers 3 choices in frame inset: standard (0 mm), small (10 mm) and performance (30 mm). This refers to the amount that the front frame, where the feet are positioned, is tapered relative to the seat width. The amount of taper will determine the front frame width and affects the maneuverability in tight spaces, the ability to get close for transfers, and the positioning for the lower extremities.