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@a_person
you was trying to work out the bcd on you cranks
but no one said how to work it out so i thought i would add it on here
BCD chart for 4-bolt chainring[FONT=Times New Roman]
[/FONT]Bolt to Bolt (measure center to center)[FONT=Times New Roman] [/FONT]BCD Bolt Circle Diameter
41mm [FONT=Times New Roman][/FONT]58mm[FONT=Times New Roman]
[/FONT]45.3mm[FONT=Times New Roman] [/FONT]64mm[FONT=Times New Roman]
[/FONT]48.1mm[FONT=Times New Roman] [/FONT]68mm[FONT=Times New Roman]
[/FONT]73.6mm[FONT=Times New Roman] [/FONT]104mm[FONT=Times New Roman]
[/FONT]79.2mm[FONT=Times New Roman] [/FONT]112mm