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If you change tire overall diameter, regardless of how, it alters things other than just gearing. Ride height and roll centre location are both altered with an alteration in tire diameter. Small changes may not be readily apparent but that doesn't mean they don't have an effect.
If you want to change the tires and wheels in order to try to reduce polar moment of inertia or overall weight fine, but it should be done while keeping the overall diameter as close to OEM as possible.
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