Upgrading tires and wheels question

[jfitz981]

I am upgrading my tires and wheels from 17"-F/ 18"-R to 19F 20R. Currently my tires sizes are 235/40-17 Front and 285/35-18. The current overall diameter is 24.4 inches Front and 25.9 inches Rear. Does anyone know or reccommend and new tire size for my 19/20 combo that would stay close to the current overall diameter? I appreciate your time..thanks.
Jason

[grahambell]

You'll find a handy tool that enables you compare tyre sizes here: http://www.carbibles.com/tyre_bible.html

[jfitz981]

Excedllent!! Thanks