Originally Posted by bullitt5897

This really depends on the tire brand and model... No two tire sizes are the same (I.E. Dunlop 305s are not the same as toyo 305s in spec sizes). This is also going to depend on the cosmetic look you want too! Stretched/bulged... I will tell you this a 245 on a 9" wheel will look identical to a stock 19" profile but just a few mm taller in sidewall.

There is sooo much more that goes into picking a tire for me but that's because I know what to look for like tirewall stiffness and multiple compound tread. Actual spec'd size of tire and more...

So all in all you are fine with your choice but if you find yourself digging for that last .1 around the track every bit helps.