15/46? Wow bet that thing does 150mph! The exact opposite of what you want on tight trails.
NO! it wont. i use 15/47 alot and the top speed is nowhere near the top speed of a stock enduro bike. it doesnt seem so "close ratio" when your in the woods with that gearing, but in more open areas im constantly up in 5th gear...
what you want on trails is long gears, not the focused acceleration you get with 14/52.
i should point out that running a rekluse will stop these meaningless gearing changes.