Shimano uses a 130 BCD for their road cranksets, has for a longtime..
the triple crank was a 110 74, as I recall ..
non round chainrings are a variable radius, so chainring is like several sizes at once.

perhaps a smaller round ring will give a better set of ratios with your rear cluster,
130 cranks can use a 38t small gear, or of course anything larger
Its a common size, so aftermarket chainring sources abound.

Other Non Round chainring suppliers : Highpath Engineering in Wales UK
will make any size and shape you wish, custom

Rotor is a Spanish company that makes non round chain rings, now...
many on the Pro Circuit use them, they have mounting holes all around the inside,
so you determine where the larger and smaller portions of the oval are
in that rotation.... Useful for recumbents as I understand..