Driving conditions will affect how much tread you can safely have on your tires but always have them inspected by a professional on every visit. Consider replacing tires when tread depth reaches 4/32” and definitely replace at 2/32”. Another important tire maintenance component is balancing. Balanced tires have a large impact on the quality and comfort of your trip. An out-of-balance tire can adversely affect ride quality, tire life, bearings, shocks, and other suspension components.