There is a 24t 10 spd chainring available from SRAM, but I don't know if it's available in 120 bcd, it's definately available for 104 bcd since Specialized uses them on their custom SRAM S-2200 cranksets. I would call them or look in 2011 SRAM spare parts catalog.
26 ring is the smallest that will fit on an XX crank. Using any combination of rings other than 26-39 and 28-42 will have serious repurcussions on shift performance and drive train dependability. The timing on these rings is very specific, and changing to a 24 small ring (if somebody made one) would impact shift performance. We have calculated that a 25 tooth ring might fit on the 80 BCD, but not a 24. The bolts interfere with the chain. The Specialized 24-38 rings are mounted to a 104 BCD crank.
Actually, the Specialized 24-38 rings are 47.5mm chain line. 49.5 applies to current 26-39 and 28-42 2x10 rings.
A Specialized S Works crank with XX rings maintains the 49.5 chainline though.
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