he is referring to the weight of the wheels affecting mpg i belive.
those CSL's are replicas, many people are happy with them, i belive they weight about 24 in 19's...same as the 17'' sport wheels
most of the guys who do bend them, do so becuase they are running a small sidewall and hit a huge pothole
ignore the other guys post, the diameter will change thats why its a 18 instead on a 16...the diameter
and dont count on any better traction or control...
depending on your wheel prefrences, the OZ supperleggara from tirerack.com, is a very strong, light, and relativly inexpensive
about more expensive wheels taking hits better... it really depends on the brand and type of wheel.