Hi, I have an old Giant Rainier that's been sitting mostly idle for a few years. The frame and Marzocchi Bomber fork are in great shape and I love the old warhorse but it needs a complete drivetrain replacement. I'm replacing the derailleurs, casette, chain, and shifters with Shimano XT (maybe with some SLX mixed in) but I'm at a loss regarding the chainrings. They're utterly destroyed (missing teeth etc.) and I'd like to throw some replacement chainrings on there and replace the entire crankset and bottom bracket at a later date ($65 for the chainrings vs $190 for the crankset + $30 for a bottom bracket + about $30 worth of tools). However, I have no idea whether the Shimano 3x10 XT chainrings will fit on my old crappy OEM cranks or not. How can I figure out whether I can continue to use my old cranks for a while?