I'm trying to decide between 205/50/16 General GMax AS 05 and 205/55/16 GMax RS. I have X- lites 16*6.5 for wheels. I have another set I use for winter so I really don't need an all-season tire. Give me your 2 cents on these two choices or feel free the throw out another idea.
I have an R53 that I mainly use as a daily but I wouldn't mind using it for an autox now and again,btw.

 

Firehawk Indy 500 in 205/50-16?
https://www.tirerack.com/tires/tires...FHI5&tab=Sizes

Not an all-season, in the proper size, and asymmetric for better tire rotations.

 

I plan to order a set of Firehawk Indy 500's in 205/50-16 for my '03S in the next month or so to replace the Comp 2's that have reached the end of their life. They are rated well for a summer tire and should give an improved ride as well.

 

OK, R53 (Cooper S) used for daily driving plus possible limited autocross. If so then Summer tire rather than All Season tire will give you better handling and response for any performance driving and better wear on the track. All Season tire better if no autocross and you need more ride comfort and low noise with longer treadlife but don't demand performance.

General GMax AS 05 Ultra High Perf All Season tire, 500 treadwear
205/50-16 $92 each on backorder, 20 lbs, W speed rated
205/55-16 $98 each on backorder, 21 lbs, W speed rated

BFG G-Force Comp 2 A/S Plus UHP All Season tire, 400 treadwear
205/50-16 $107 each on backorder, 22 lbs, W speed rated
205/55-16 $116 each, 23 lbs, W speed rated
Tirerack test result vs GMax AS 05
https://www.tirerack.com/tires/tests...y.jsp?ttid=253
G-Force Comp 2 A/S Plus tests better for street use and dry/wet performance

General GMax RS Ultra High Perf Summer tire, 360 treadwear
205/55-16 $95 each on backorder, 21 lbs, W speed rated
225/50-16 $105 each, 22 lbs, W speed rated (will fit OEM 16" wheel, higher cost, wider tire, lower profile, same tire diameter 24.9")
Tirerack test result vs Yokohama Fleva V701
https://www.tirerack.com/tires/tests...y.jsp?ttid=247

Firestone Firehawk Indy 500 Ultra High Perf Summer tire, 340 treadwear
205/50-16 $114 each, 21 lbs, W speed rated, tire diam 24.1"
205/55-16 $113 each, 21 lbs, W speed rated, tire diam 24.9"
225/50-16 $131 each, 22 lbs, W speed rated, tire diam 24.9"
Tirerack owner survey results
https://www.tirerack.com/tires/surve...=true&filter=y
Tirerack test results vs Gen GMax RS
https://www.tirerack.com/tires/tests...y.jsp?ttid=235
Indy 500 not quite as good for street use, not as good in wet

Yokohama Advan Fleva V701 Ultra High Perf Summer tire, 300 treadwear
205/50-16 $112 each, 19 lbs, V speed rated
205/55-16 $112 each, 20 lbs, W speed rated

For street use the UHP Summer tires look OK, prices, weights and speed ratings look similar enough. In general 50 series sidewalls are a little stiffer than 55 series but it may vary with each tire as some ride more comfortably in general than others. UHP All Season will give a little more treadlife but won't handle and perform as well for performance driving. Autocross will be vastly better with Summer tire.

Yokohama Advan Fleva V701 is worth a look in 205/50-16.
BFG G-Force Comp 2 A/S Plus is a common daily driver choice for UHP AS tire in 205/50-16