18" rims on a 997S?

[hatchback]

From reading posts, it seems like 18" rims provide a better ride and better handling than 19" rims, and tires for 18" rims are cheaper than those for 19" rims, but many people think 19" rims look better. Is that true? If so, can you put 18" rims on a 997S, which ships with 19" rims standard, or will it confuse the speedometer/odometer or any of the computerized systems like ABS or ESP? Thanks.

[jnx]

From reading posts, it seems like 18" rims provide a better ride and better handling than 19" rims, and tires for 18" rims are cheaper than those for 19" rims, but many people think 19" rims look better. Is that true? If so, can you put 18" rims on a 997S, which ships with 19" rims standard, or will it confuse the speedometer/odometer or any of the computerized systems like ABS or ESP? Thanks.

18" will give a better ride, while 19" will be better handling. both 18" and 19" have the same diameter so it will not change speedometer/odometer. Why would you want to put 18" instead of19" on a S ?

[hatchback]

both 18" and 19" have the same diameter so it will not change speedometer/odometer.

AFAIK, the size measurement refers to the diameter of the rim, so 18" rims have an 18" diameter while 19" rims have a 19" diameter. The dimensions of the tire will also affect the ultimate wheel size. My question is whether the 997 electronics will self-adjust to different wheel/rim/tire diameters or whether you must use OEM specifications to ensure the correct functioning of the speedometer/odometer and all the electronic systems that look at wheel speed (ABS, traction control, and stability protection). Hopefull some renntecher knows the answer to this basic question!

[Loren]

If you use the factory recommended tires/tire sizes (for the wheel size) you will not have any problems.

[jean]

both 18" and 19" have the same diameter so it will not change speedometer/odometer.

AFAIK, the size measurement refers to the diameter of the rim, so 18" rims have an 18" diameter while 19" rims have a 19" diameter. The dimensions of the tire will also affect the ultimate wheel size. My question is whether the 997 electronics will self-adjust to different wheel/rim/tire diameters or whether you must use OEM specifications to ensure the correct functioning of the speedometer/odometer and all the electronic systems that look at wheel speed (ABS, traction control, and stability protection). Hopefull some renntecher knows the answer to this basic question!

The overall diameter ( rim + tire ) affect the speedometer reading.

Your electronics will not self adjust.

If you put 18" rims on the 997S, you will need to put on larger profile tires of the correct size.

I understand that snow tires are routinely put on 18" rims.

[hatchback]

Thank you, Loren and Jean.