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I say 19”s over 20”s as everyone else suggested here. I’ve got 19” BBSs on my 997S and they look great without making me looking like racer boy. Also, if you live in a area of giant pot hole, you would regret those 20s in a week.
I got 20” initially and ended up swapping back the stock 19”. My car is dropped about 1” so I needed 30 profile tires for fender clearance. The ride was rough and not great for HPDE events
20" is pushing it on the 997 but in a forged design it works well with respect to the weight issue.
By dropping the car and adding centerlock I think it came out pretty nice.