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[junhyuk8901]

Hi, I have questions for ZCP wheels' tire.

I heard many people saying the best tire size for ZCP wheels are

Front 245/35-19 Rear 275/30-19 Tires. As you know, front is fine because

both sides are suggesting same size of tire. But, i was wondering why OEM

ZCP tires are comes with 265/35-19 for the rear. If the 275 is the best??

Thank u

[calintexas]

Why wouldn't you go with 255/35's and 275/35's? That maintains the OEM stagger and reduces speedometer error. That's the size virtually all the RAC group buy guys used with the same width wheels and slightly more offset than the ZCP wheels.

[aajami]

Originally Posted by calintexas

Why wouldn't you go with 255/35's and 275/35's? That maintains the OEM stagger and reduces speedometer error. That's the size virtually all the RAC group buy guys used with the same width wheels and slightly more offset than the ZCP wheels.

Ditto.

[junhyuk8901]

Then, why does BMW come with 245 and 265? IF 255 and 275 is much better????

[calintexas]

Originally Posted by junhyuk8901

Then, why does BMW come with 245 and 265? IF 255 and 275 is much better????

It's likely cost. The price that BMW pays for the 245's and 265's (for the M3) was probably negotiated years ago with some cost increase factor built in. New tire sizes would have meant a new negotiation and likely higher costs (to BMW).

"Much better" is going a bit far. The 255 and 275 sizes add a bit of width and maintain the handling balance that BMW built in. If you stick with 245's in the front and go to wider rears, your car will have more of a tendency to under steer. If that's what you want, then have at it.

[elh0102]

Originally Posted by junhyuk8901

Then, why does BMW come with 245 and 265? IF 255 and 275 is much better????

Tire size is a compromise between handling/traction, clearance, and feel. Larger tires transmit more tramlining and noise. The sizes you mention are not going to yield any noticeable advantage over the OE setup. A much more significant difference can be found with different tires, but keeping the OE sizes. If the car has more understeer than you want, then going to relatively larger front tires will help. This is a subjective and personal thing, depending a lot on driving style. Personally, I find the E92 M3 to have significantly less understeer than did the E46, and I'm not inclined to mess with it for general use.