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This is just telling you which of SRAM's pregonfigured chainring options on their complete cranksets it can shift.
If it can shift 22/36 which is a 14 tooth difference then it can shift the 10 tooth difference of your 38/48 no problem, providing you can mount it in the correct place in relation to the larger chainring (regular FD setup).
Some manufacturers adjust the curvature of the FD plate to ensure better shifting with smaller rings but in reality this makes little difference.
lmamammal-
This is just telling you which of SRAM's pregonfigured chainring options on their complete cranksets it can shift.
Ah, that makes a bit more sense. Still not much wiser whether I'd want a low or high clamp and if it's going to reach, though :(
Road cranks with mtb FD?
Yes. I'd go for a 1x but it's 130bcd and all the narrow/wide chainrings in that bcd look ridiculous. I'm considering sticking a chain catcher on instead.
Jonny69
SRAM X7 2x10 front derailleur questions. This is a mtb part. Is the cage going to struggle with road size rings? I'm wanting to use my 48/38T setup on my existing cranks. Some places quote some ring sizes e.g. 36/38T - is that its upper tooth limit? Then on SRAM's site there's High direct mount and Low direct mount. Is that the derailleur itself or where the mount is attached to the frame? On the datasheet it's got like a matrix with 42/28 and 39/26 above and below each other. Does that refer to the maximum capacities on each mount? So confused.