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|   | ZR | Summary | 
Measure from front of back post to the front edge of seat sling. Frame bend will start 0.5" (1.3 cm) in front of seat sling unless Custom Frame Depth is specified or the combination of specifications affects the rolling dynamics of the chair.
| ZSD1 | 10" (25.4 cm) 10 11" (27.9 cm) 11 12" (30.5 cm) 12 13" (33 cm) 13 14" (35.6 cm) 14 15" (38.1 cm) 15 16" (40.6 cm) 16 17" (43.2 cm) 17 18" (45.7 cm) 18 19" (48.3 cm) 19 | STD | 
| ZSD2 | 20" (50.8 cm) 20 | $568 E2203 | 
