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Backspacing 4" = 101,6mm alt 4,75" = 120 mm ET -12 mm alt +6 mm..
Backspacing 4,25" = 108 mm ET +6 mm..
Backspacing 4,5" = 114,3 mm ET +0 mm..
Backspacing 5" = 127 mm ET +0 mm..
Backspacing 5,75" = 146 mm ET +6 mm..