[mimilo]

Hi, i have an R85's in my MCS2004, with 205/40 r17 RFT's, and i want to change to 205/45, non runflats, but im not shure if keep in 40 or change to 45. I would like to have a great handling in corners, but also good acceleration and comfort.
Also i have heard about 215/40, some people say that are good too, or even 215/45, but im little confuse, i dont know what to choose in order to get what i need.

Ill apreciate any help

Thanks

[MINIAC]

OEM run flat tires are 205/45-17.

Here's the tire sizes which will fit on R85 wheels:

+-----------+-------------------+
| TIRE SIZE |     DIAMETER      |
+-----------+-------------------+
| 205/40-17 | 23.46in (595.8mm) |
| 215/40-17 | 23.77in (603.8mm) |
| 205/45-17 | 24.26in (616.3mm) | 
| 215/45-17 | 24.62in (625.3mm) |
+-----------+-------------------+

As diameter increases, ride comfort improves but acceleration suffers.