okay, shift the gear

19" for Lexus, 20" for Mercedes and 22" for BMW - My thumb rule

17" GS is a Luxury car, not a race car, so I don't think 17" will look good

 

come on now, you gotta throw in 20s for the lexus gs as well

but seriously, i am not trying to offend anyone, but putting on 20s with stock height the car will look so out of place. personally of course i will never do that, but if really not going to lower the car, i would get that big of a wheel

 

Lookwise 20" is better

We tried both 19" and 20" (same wheel) on the same car, 20" is little bit bumpy.

Personally, I don't care about this bumpy feeling, especially I think GS owners will not care easy. But I think LS owners might care because statistically LS owners are about 10-15 years older than GS owners so they care more about the comfortibility than appearance and performance per my experience

 

very interesting, i wonder why that's the case, considering that the 19s and 20s use the same profile tires? (i assume you were not running fat setup)

 

you are absolutely right, not fat setup. Again, that feeling is just very minor