My bike can use stock chain with 15/47. How much have you backed off the adjusters currently? If they're al the way forward, then no, it probably wont fit. I cant remember exactly how much difference there is in the adjuster for a 45 and a 47. I think its around 6 clicks (2 numbers)
For really loose heavy sand, a lover than stock gearing would be best. How much of that are you gonna ride ? you know whats best for you, but I woudl say, when in doubt, choose the lover gearing, and just go a bit slowe, or "ring her out" more on the tarmac.
I think a 47 is what you want, but only you will really know
You could also go stock, and bring a 14tooth along, doesnt take much time to change, but I dont know if its worth it for ya? You would probably go crazy if you should change oit several times during the day. But if would be nice if you know you got a longtarmac-day ahead. but as I said, perhaps not the best option for you, in this situation.
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