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A tire inspection at Route 66 Auto Repair in Upland reads each tire for tread depth, wear pattern, damage and age. The wear pattern matters as much as the depth, because it shows what the suspension and alignment have been doing. We sell, mount and balance new tires, and when alignment is needed we arrange it and road-test the result.
What do tire wear patterns mean?
- Both edges worn: usually underinflation, common when pressures go unchecked for months
- Center worn: overinflation
- One edge worn: an alignment angle out of spec or a worn suspension part
- Cupping or scalloped dips: worn shocks or struts, or a balance problem
- Feathered tread: a toe setting that is off, often after a curb hit
- Flat spot: a hard skid or a brake that locked up
Why does tire age matter in Upland heat?
Rubber ages even when it is parked. Heat and sun speed that up, so a tire with deep tread can still have cracks between the tread blocks or on the sidewall. We read the date code on the sidewall, a four-digit week and year, and note it on the report.
We also check for nails, plugs too close to the sidewall, bulges and cuts, and whether the tires match the size and load rating on the door placard. That last point matters on trucks and vans that tow or haul. The NHTSA tire safety page (opens in a new tab) explains the sidewall markings if you want to read along.
There is widely published guidance on age. Many tire makers and vehicle makers advise replacing tires somewhere between six and ten years from the date code no matter how deep the tread still is, and several spare tires we pull out from under trucks are older than that. Heat shortens the clock rather than lengthening it. We note the date beside the depth readings and point you to the interval your tire maker and vehicle maker publish, which is the one that governs.
How we inspect your tires
Step 1: Pressure check
Cold pressures are compared with the door placard, and any low tire is noted.
Step 2: Tread and pattern
Tread depth is measured across each tire and the wear pattern is recorded.
Step 3: Damage and age
Sidewalls, date codes and past repairs are inspected.
Step 4: Cause check
Uneven wear gets a look at suspension and steering parts.
Step 5: Recommendation
You get a written result per tire, plus tire, suspension or alignment options if needed.
What's included in a tire inspection
Included on the work order
- 01Tread depth at inner, center and outer points
- 02Wear pattern notes for each tire
- 03Date code and sidewall condition
- 04Pressure check and TPMS light review
- 05Puncture and past repair check
- 06Suspension look when wear is uneven
Which findings are need-now, and which can wait?
Need now: call
- Tread at or near the wear bars
- A sidewall bulge, cut or exposed cords
- A slow leak you keep refilling
Need later: book
- Mild edge wear that calls for a rotation and a pressure habit
- Tires with tread left but visible aging cracks
How pricing and timing work
The inspection price is stated up front. If you need tires, the estimate lists the tires, mounting and balancing. When the wear points to alignment, we inspect the suspension, arrange the alignment and road-test the car afterward. See tire services and the suspension inspection for next steps, and the brake system inspection report if a flat spot points to a locking brake.
Frequently asked questions
How much tread is enough?
Most tires have wear bars at the legal minimum, but wet braking gets noticeably worse well before that point. We measure the depth and tell you how it compares with new, so you can plan replacement before the rainy months.
Why does my TPMS light stay on?
TPMS is the tire pressure monitoring system. The light can mean a low tire or a failed sensor. We check pressures first, then scan the system if the pressures are right and the light stays on.
Do you do wheel alignments?
Alignment is not done in our shop. We inspect tire wear and the suspension, arrange the alignment for you, and road-test the vehicle when it comes back.