What's the rear spacing on the bike? Which SRAM crankset? The one Powerspline crankset I found recommends either a 113mm or 118mm, presumably to fit either 120mm or 130mm rear spacing.

If you can adjust the position of your cog on the rear wheel, you might be able to get the 108 to work but it may also put the chainrings too close to the chainstays.