this year on my 29er hardtail. As far as I know, 29 tooth rings aren't easily available without going custom or finding one of the older Ritchey setups. I got and old LX square taper crankset (with the cassette style chainrings) off of eBay that I had a 5 arm 94/58mm spider for. I'll be running 30/42 tooth rings and an 12-34 tooth cassette. I think the square taper cranks might be better for this application since you can fine tune chainline with different spindle lengths...the newer splined cranks don't usually offer more than 2 spindle lengths and the shorter one is usually a bit too long for a double chainring set up.