Here's why it's complicated:
* Bolt Pattern: This refers to the number of lug nuts and the distance between them. A 15-inch rim needs to have the *same* bolt pattern as your Tahoe's hub. The wrong bolt pattern will prevent the wheel from mounting securely. Look up your Tahoe's bolt pattern in your owner's manual or online.
* Wheel Offset: This is the distance between the wheel's mounting surface and the centerline of the wheel. Incorrect offset can cause clearance issues with the suspension, brakes, or other parts of the vehicle. Again, consult your owner's manual or a reliable online resource for the correct offset.
* Backspacing: Similar to offset, this measures the distance from the mounting surface to the inner lip of the wheel.
* Overall Diameter: While a 15-inch rim *might* be smaller than what came originally on your Tahoe (some came with 16-inch wheels or larger), the overall diameter of the wheel and tire combination needs to be within a certain range to avoid speedometer inaccuracies and potential damage to your vehicle.
In short: Don't just assume a 15-inch rim will fit. You must verify the bolt pattern, offset, and backspacing are compatible with your 1999 Chevy Tahoe. Use your owner's manual or a reputable online resource (like Tire Rack) to find the correct specifications for your vehicle before purchasing any wheels.
