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@hippy
Work out BCD:
http://www.sheldonbrown.com/gloss_bo-z.html
http://www.sheldonbrown.com/harris/chainrings.html
Measuring BCD: This 110 mm BCD ring measures 64.7 mm center-to-center.
Multiplying this dimension by 1.7 will give you the actual BCD for a 5 bolt chainring.
Use 1.4 for 4 bolt chainrings