Size and Fit Guides

Icon™ Back System 

When choosing an Icon™ Back System, consider the widths of the wheelchair, the back shell and the support surface, plus the type of laterals.

View or download our complete Icon Back Technical Guide shown with inches or metric sizing. 

Evolution Back System

Below is a guide to properly fit back systems on wheelchairs. When choosing a back system, you need to consider the width of the wheelchair, back shell, support surface and type of laterals.

Points of Measurement

A. wheelchair width

B. outside shell width

C. width of support surface

D. width of support surface between laterals

E. width of support surface between offset laterals

Evolution Back System

Evolution Back Deep™
Size     A B C
  To fit wheelchair widths Outside width of shell Width of support surface
14 14" & 15" 14" 13.25"
15 15" & 16" 15" 14.25"
16 16" & 17" 15.75" 15"
17 17" & 18" 17" 16.25"
18 18" & 19" 18" 17.25"
20 19" & 20" 20.25" 19.5"

Evolution Back™ and Evolution Back™ Tall
Size A B C D E
  To fit wheelchair widths Outside width of shell Width of support surface Width of support surface with laterals Width of support surface with offset laterals
12 11" & 13" 9.375" 8.625" 7.375"- 7.875" 5.875"- 6.375"
14 13" & 15" 11.375" 10.625" 9.375"- 9.875" 7.875"- 8.375"
15 14" - 16" 12.25" 11.5" 10.25"- 10.75" 8.75"- 9.25"
16 15" - 17" 13.25" 12.5" 11.25"- 11.75" 9.75"- 10.25"
17 16" - 18" 14.25" 13.5" 12.25"- 12.75" 10.75"- 11.25"
18 17" - 19" 15.25" 14.5" 13.25"- 13.75" 11.75"- 12.25"
20 19" & 20" 17.25" 16.5" 15.25"- 15.75" 13.75"- 14.25"
22* 21" & 22" 19.25" 18.5" 17.25"- 17.75" 15.75"- 16.25"
24* 23" & 24" 21.25" 20.5" 19.25"- 19.75" 17.75"- 18.25"