How much tire clearance does the 30mm extension actually add?

The 30mm flare extension lifts the fender line outward by that amount, creating room for wider tires or lower suspension without contact at full compression or lock-to-lock steering. Verify your specific tire diameter and wheel offset against your current suspension geometry before final fitment.

Do these mount to factory bolt holes, or is drilling required?

These flares are designed to integrate with factory mounting locations on the rear quarter panels. No cutting or drilling of the body is necessary — fasteners secure directly to existing hardware points. You may need to drill new mounting holes into the flare panel itself depending on your vehicle's OEM hole layout; compare your factory body before assembly.

What wheel sizes and offsets work with these flares?

The 30mm extension accommodates most common wheel and tire combinations without contact, but final fitment depends on your suspension height, tire sidewall profile, and specific wheel offset. Measure your current setup before ordering and account for suspension travel — the flares give you the clearance window, but you need to confirm your wheels stay within it.