I currently have a CAAD9-7 that runs 9-speed Tiagra FD and RD. I bought a Sram Rival chainset for the bike, I was told this combo will work. First off do i need to change the chain that is on the bike if it is in good condition? If I do need to swap chain would I simply buy another 9 speed chain?

I am new and still learning please forgive me.

Thanks,
Jess