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If you have chainrings in 144 and want to mount them onto cranks with 130 bcd this will adapt them.This part keeps the same chainline since the mounting surface for the 130 and 144 sides are on the same plane. You will need to acquire another set of chainring bolts. I designed this because I bought a road fixed gear for training purposes but the cranks were 130bcd. I already had a full set of 144 bcd rings for my racing track bike and buying a new crankset was too pricey.
Weight: 37 grams without chainring bolts.
update:Printed in plastic to test fit. Printing in stainless to test strength. will update soon.
Compatibility: will not work with disc style chainrings such as the FSA track ring since the diameter of the inner circle would go right through the 130 bcd mounting holes.