Rear Sprocket Question

Lunchy

Registered
Hey all, first post. Did search but didn't find what I was looking for. So, I want to go to a +2 (45) rear sprocket, but I only have 3,000 miles on the bike. Can I get away with just replacing the rear sprocket? Also, when I was looking at purchasing said sprocket there was an option for pitch (?) of stock or 530? Lost on that. Any advice or help would be greatly appreciated. Thanks -L.
 
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