How much tire clearance do these add?

The ZR-C profile extends the fender line to accommodate wider tires and wheels. For your specific tire and wheel size pairing, measure the current gap between your sidewall and fender at full compression, then verify the flare depth accommodates your setup before installation.

Do I need to drill holes to install these?

No. These flares use factory mounting points on your existing fenders, so no drilling or body modification is required. You'll bolt them directly to the stock attachment locations.

What wheel offset range works with these flares?

These are designed to work with common aftermarket wheel offsets. For your specific wheel size and offset combination, verify that the inside of your tire doesn't contact the flare at full suspension compression and full lock.