Slow Twitch has a great review published on made in the USA WickWerks’ chainrings. These chainrings use a unique ramp design instead of pins for shifting. They weigh in very competitively to other high end brands and don’t cost an arm and a leg.
WickWerks’ take on shifting technology is very unique. They don’t use any pins at all (save the outer catch pin in case of outside derailment). Rather, they use a very aggressive system of ramps, which they call BRIDGE technology. – Slow Twitch