1999 Gs400 New Tires Plus Size Need Help

[1999Lexus_GS400]

Hello I'm new to this forum. I own a 1999 Lexus GS400 I have the factory 17x8 5 spoked wheels, factory tire size is 235/45/17. I would like to know if I could go to a 245/40/17 and not change my speedo much or cause much more tram lining. Any suggestions would be greatly appreciated. Thanks

Dave

[01 Ultra]

Here is a link to a helpful webpage that will calculate the exact size you will need.

http://www.miata.net/garage/tirecalc.html