new clones
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Radikal Bikers (Version 2.02) [Ricky2001 (from AUMAP)]

note, this is the original Gaelco version, the one we had was the Atari license, only one rom differs so I guess it's a region / license byte.
note2, pretty sure multithreading is broken with poly.c, you have to use -numprocessors 1 or the whole thing is a flickering mess.