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Originally Posted by woj
hmm, I always thought custom rims are actually lighter than the stock ones...
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That isn't always the case and in any event bigger tires will also affect the result.
Changing wheel/tire dimensions will always impact on a car's handling because of the resulting changes to suspension and steering geometry. If the manufacturer has skimped on wheels and/or tires, such changes
might be an improvement, but that is a dangerous assumption.
Changes to the total diameter of wheel and tire will affect overall gear ratios and therefore performance. Moving away from recommended tire types and sizes will often give a poorer and/or noisier ride. Wheel/tire changes often put extra stress on other components which will shorten their life and in extreme cases, prove dangerous.
Unless posing is all that matters, changing any dynamic component on a car is a job for someone who knows everything which needs to be changed to make the new parts work well with the originals that remain.