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What the others said. 46 is a huge chain ring, esp if you are going dirt. The popular size for mixed use started out as 42, and that's still what comes stock, but unless you are chasing groups on the road or racing on rolling dirt, most of my crowd has downsized that considerably. Consider the position on the bike and what it will be like to grind out a climb - you won't have as much traction as a cushy, knobby mtb and if you have to stand, you will almost certainly spin the rear wheel.
I'd consider 42 the max, and smaller probably better. I started out 40 11-42 on my Traildonkey and swapped down to a direct mount 36, which I'm very happy with.
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