Was adjusting my chain and noticed that I have a 45 tooth rear sprocket in place of the stock one (bought the bike used). The bike runs great, as you would think, but I wonder how much higher the rpms are at 65 that they would be stock
Bike now runs 4K rpms at 65 mph. (Speedo is about 5 mph off at 70, I think.)
Thanks in advance.

 

Hey, tom..
It should be running about 300rpms faster @ 65mph with that setup.
I run a 44rear.

Check this site out.... it will show you whatever you want to know with regards to different gear setups:
Gearing Commander