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I've been running 235/45 18 and 265/45 18 which is the factory size tyre for an 18" wheel for several years in the RE71R, but those are no longer available. I tried something else in a 245/40 275/40 setup and it lowered the car quite a bit (.3" in the front and .36 in the back, on X73 that had me hitting in one point and made it impossible to get my lift or jack under the car without first putting it on a wood plank). Now of course you can't get RE71Rs so I was going to try A052's which are available in that size, but they've been out of stock on the fronts since September. Unfortunately it doesn't look like anyone is making anything appropriate in this size any longer, and even most of the next size seem out of stock.
 

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2013 Boxster S
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When I first acquired my BS with 19" wheels, I explored the idea of replacing them with 18"s. Using Tirerack, I searched for 18" tires in the recommended sizes. While I don't recall the exact numbers choices at the time, it was probably less than 10. By contrast, my 987 BS with 18's had a ton of choices.
 

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This will be fine. Also depends on what offsets you are running if you want to go wider.
Hankook Rs4 and Yoko A052 work in 245/40/18 and 275/40/28
RE-71R in 255/35/18 and 275/35/18
Hankook z214 (DOT slicks) in 245/35/18 and 275/35/18
Nitto NT01 in 245 and 275 work

For those with more than 3 degrees of camber you can get Hoosier R7 245/40/18 and 295/40/18

Note: especially with Hoosiers, look at the exact measurements (tread width/etc) and don’t go based on the spec eg 245. For instance, the tread of the R7 in 255/35/18 and 275/35/18 are essentially the same.
Would
245/45ZR18/XL 100Y and 275s work
 

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I replaced my older model RE71R with Bridgestone's new model RE71RS a couple of months ago, Size is 255/35/18 f and 275/35/18 r on 9" wheels f and 10" in R. The Bridgestone new model works very well for the street as well as track. I run Ohlin coilovers so about 35 mm drop. I had my shop give a little more drop in the rear to take the rake out as well. I have a LN skid plate under my sump just in case.
The RE71RS demonstrates precision in selected line, good response, especially when toe out is used in front, progression is very linear all the way to breakaway. The balance, oversteer, and understreer is easily adjusted with Tarett GT adjustable swaybars. I am happy with the footprint size that was chosen especialy getting the power down from the apex with a Wavetrac LSD.
 
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