Hey Mac, had TK’s front and rear on my Spitty to begin with and was the 2.3, which were fine size wise and the HR2 in 2.35 I’m currently running looks about the same size. Oh and make sure they’re protection ones if planning on running tubeless.
The HR2 is a better tyre on the rear IMO though so maybe a better option for you, mine is a max terra 3C compound and has lasted me since about March, although the knobs are starting to look pretty worn on the sides but then I’ve not had a huge amount of riding this year which is why it’s lasted as long as it has.