Don't wait and change out the chain before your trip, the sprockets should be OK. I was on part of the 5,000 mile Western States tour and the daily hammering required chain adjustment/inspection every evening on every bike. Once the chain starts to stretch, it goes very quickly. Sorry that I don't have anything to add for the sprockets, mine are still good with over 7,000 miles.
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George
2016 CanAm Spyder F3-L
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