What do the choices in frame angles mean?

What do the choices in frame angles mean?

The front frame angle on a rigid wheelchair affects positioning of the feet and legs (i.e., how close the feet are positioned to the wheelchair frame). The front frame angle also affects the wheelchair’s front-stability, and turning radius. To achieve the optimized configuration for each individual, the Nitrum offers 3 choices for its front frame angle: 100°, 92°, and 88°.