How to Check Your Tread Depth
Takes 30 seconds. All you need is a quarter.
The Quarter Test
The simplest way to check if your tires need attention
Grab a quarter
Any 25¢ coin will do - you probably have one in your car
Insert it in the tread
Put it in your tire's tread groove with Washington's head pointing down
Check Washington's head
Look at how much of his head you can see above the tread
You're above 4/32" - tires are good
You're at 4/32" - start shopping around
Below 2/32" - time to replace now
Why 4/32" Is the Magic Number
Understanding the difference between legal and safe
The Real Difference
- •Stopping distance gets noticeably longer
- •Wet roads become more slippery
- •You're one rainy day away from hydroplaning
When You're Ready to Shop
Forget brand names - here's what actually matters
Complete Guide to Tire Maintenance
Your tires are the only part of your car that touches the road. Proper tire maintenance not only keeps you safe but also saves money by extending tire life and improving fuel economy. At King's Custom Tires in Denver, our team brings 15+ years of experience helping Colorado drivers understand their tires.
Reading Your Tire Size
Every tire has a size code molded into its sidewall, typically something like "225/65R17 102H". Here's what each part means: 225 is the width in millimeters. 65 is the aspect ratio—the sidewall height as a percentage of width. R means radial construction (standard for passenger vehicles). 17 is the wheel diameter in inches. 102 is the load index (how much weight the tire can support). H is the speed rating (maximum safe speed). When replacing tires, match these specifications exactly or consult a professional about safe alternatives.
Understanding Tread Depth
New tires come with approximately 10/32" of tread depth. As you drive, this tread wears down. The minimum legal tread depth is 2/32", but we recommend replacing tires at 4/32" for all-season tires and 5/32" for winter tires. At these levels, tires still provide adequate traction in most conditions and have enough remaining life to get you through to your scheduled replacement rather than an emergency situation.
Signs Your Tires Need Attention
- Uneven wear patterns: Wear on one edge often indicates alignment issues. Center wear suggests over-inflation. Edge wear on both sides suggests under-inflation.
- Vibration while driving: Could indicate balance issues, internal tire damage, or suspension problems.
- Cracks in the sidewall: Rubber deteriorates over time from UV exposure and ozone. Cracks indicate the tire is aging out.
- Bulges or blisters: These indicate internal damage, often from hitting potholes or curbs. Replace immediately—a blowout risk.
- Age over 6 years: Even with good tread, rubber compounds break down. Check the DOT code for manufacture date.
Tire Pressure Matters
Proper tire pressure is critical for safety, tire life, and fuel economy. Colorado's elevation changes and temperature swings can cause significant pressure fluctuations. Check your tire pressure monthly and before long trips. The correct pressure is listed on the driver's door jamb sticker—not on the tire sidewall (that's the maximum, not recommended pressure). Under-inflated tires wear faster on the edges, reduce fuel economy, and can overheat. Over-inflated tires wear faster in the center and provide a harsher ride.
Rotation Schedule
Regular rotation extends tire life by promoting even wear. Most manufacturers recommend rotation every 5,000-7,500 miles—typically at every oil change. The rotation pattern depends on your drivetrain (FWD, RWD, AWD) and whether your tires are directional or asymmetric. Skipping rotations leads to uneven wear that can require premature replacement.
Have questions about your specific tires? Stop by our shop at 4101 Colorado Blvd in Denver for a free inspection, or use our AI tire assistant for personalized recommendations. We're here Monday through Saturday 8am to 6pm.