Is this a decent trade? Dont know much about raderwerks

[Ross08]

So i have a set of chrysler crossfire wheels up for trade and theyre basically brand new only 3 months old. and for everything i paid about 1600 for them. a kid offered me 18x8 and 18x9 raderwerk mten-80's. i like the wheel itself but not sure if he should add cash or if theyre just a really played out wheel. or worth anything. i dont wanna downgrade wheels at this point. Also hes running a 215 up front and a 225 on the rear. A 225 in the rear is kind of beefy i feel like. i would wanna stretch them. anyone has info let me know please.. thanks guys

[Ross08]

anyone?