Treaded tires can still blow out on the highway if they're old enough. The NHTSA-approved DOT date code, the 5-year inspection rule, the 7-year replacement line, and what to ask the host before pickup.
Tread depth doesn't save you from age
Tires with full tread depth can still rupture catastrophically on the highway if the rubber compound has degraded from age. The National Highway Traffic Safety Administration (NHTSA), Tire and Rim Association, and the Recreation Vehicle Industry Association (RVIA) all converge on the same rule: RV tires should be replaced at 5-7 years from the date of manufacture regardless of remaining tread depth, per the NHTSA tire-aging research summary at nhtsa.gov/equipment/tires.
Why RVs are different from passenger cars on this question: RVs spend 95% of their life parked, where UV exposure, ozone, and heat-cycling degrade the rubber compound faster than rolling miles do. A passenger car's tires wear out (tread-wise) before they age out. An RV's tires age out before they wear out, and the failure mode is sidewall belt separation at highway speed — the most dangerous tire failure in motor-vehicle physics per NHTSA crash data analysis.
How to read the DOT date code
Every tire sold in the US carries a DOT (Department of Transportation) code molded into the sidewall. The last 4 digits are the date of manufacture: the first 2 digits are the week (01-52) and the last 2 are the year. A DOT code ending in '2624' means the tire was made in week 26 of 2024 (late June 2024). A code ending in '4519' means week 45 of 2019 (early November 2019) — a 6.5-year-old tire as of 2026-06.
The DOT code can be on the inside sidewall (mounting-side) only. Inspect both sides of every tire. If the code is on the inside and the rig is mounted, the host can rotate the tire 180° to expose the code, or pull the rig to a tire shop for inspection. A host refusing to share the DOT codes of all 4-6 tires is a non-starter — book elsewhere.
- DOT code: 8-13 characters on the sidewall, starts 'DOT '
- Last 4 digits: week (1-52) + year (last 2 digits)
- Example: '2624' = week 26 of 2024 (late June 2024)
- Inside-sidewall codes may need rotation to inspect
- All 4-6 tires on the rig (incl spare) should have current codes
The 5-year inspection and 7-year replacement lines
Per the NHTSA + RVIA + Tire Industry Association consensus: at 5 years from manufacture, RV tires should be inspected by a qualified tire technician for cracking, sidewall belt separation indicators, and rubber-compound degradation. At 7 years from manufacture, RV tires should be replaced regardless of visual condition or tread depth per the RVIA's published industry standard.
Some commercial fleet operators (FedEx, UPS, motor-coach companies) use a 10-year hard line for their trailer and motorhome tires per their respective fleet-maintenance bulletins, but they also operate climate-controlled garaging and rotate stock aggressively. For consumer-owned and consumer-rental RVs that sit outdoors for months at a time, the 7-year line is industry-standard.
- 5 years from manufacture: qualified-technician inspection required (NHTSA + RVIA)
- 7 years from manufacture: replacement regardless of tread (RVIA standard)
- 10 years: hard ceiling under any conditions (industry consensus)
- Spare tire: same rules apply — age-out a spare just like running tires
Visual signs of dangerous tire aging
Per the Tire Industry Association inspection manual at tireindustry.org and the NHTSA tire-safety publication, the following visual signs indicate a tire that should be replaced immediately regardless of age:
- Sidewall cracking (radial cracks > 1/32-inch deep)
- Crown cracking (cracks in the tread groove bottom)
- Sidewall bulges, blisters, or deformation
- Belt edge separation visible as a ripple in the tread
- Exposed steel cord (any condition)
- Uneven tread wear pattern suggesting misalignment
- Tread depth < 4/32 inch (motorhomes per NHTSA recommendation)
The questions to ask your host before pickup
Before confirming a PickRV booking on any rig more than 3 years old, ask the host these six questions in writing. A host who can't answer or who answers vaguely is hiding something — there are too many alternative listings on PickRV to risk a tire failure on a peak-summer interstate.
- 1. What is the DOT date code on every running tire + the spare?
- 2. When was the last qualified-technician tire inspection (date + shop)?
- 3. Have any tires been replaced since the rig was new — if so, when?
- 4. What is the cold tire pressure spec (per the tire sidewall + the door-jamb sticker)?
- 5. Is there a TPMS (Tire Pressure Monitoring System) installed?
- 6. Are roadside-assistance + tire-roadside-service plans included?
Cold pressure + load-rating math
Per NHTSA + the Federal Motor Vehicle Safety Standards (FMVSS) 110, every motorhome carries a tire-information placard near the driver's seat or fuel-fill door specifying the cold tire pressure for both unloaded and fully-loaded conditions. Underinflation by even 10-15% accelerates sidewall failure and is the leading cause of RV tire blowouts per NHTSA crash data.
Load-rating math: the sum of the load ratings of all tires must equal or exceed the GVWR (Gross Vehicle Weight Rating) printed on the manufacturer's data plate. If a host has replaced original-equipment tires with lower-load-rated tires, the rig is illegal to operate at full load per FMVSS 110 + DOT enforcement guidance.
What replacement actually costs
RV tire replacement at a commercial tire dealer in 2026 runs roughly $250-450 per tire installed for Class C size (LT225/75R16 or 245/70R19.5), $450-750 per tire for Class A size (255/80R22.5 or 295/80R22.5). The spare counts. A full 6-tire replacement on a Class A diesel pusher can run $3,000-4,500 installed.
Per Discount Tire, Costco Tires, Sam's Club, and the National Tire Dealers Association published price ranges, the cheapest path is buying tires from a national chain that price-matches and offers free rotation + balance for the life of the tire. The most expensive path is buying from a mobile-installation RV-specialty shop at a destination — convenient but typically 25-40% above retail.
ST vs LT vs commercial — which tire goes where
RV tires fall into three federal-recognized service categories per the Tire and Rim Association yearbook + DOT classification: ST (Special Trailer), LT (Light Truck), and commercial truck. The category molded on the sidewall determines what the tire is legally designed to handle. Per the Federal Motor Vehicle Safety Standards (FMVSS 119 for ST + LT, FMVSS 121 for commercial), substituting between categories voids manufacturer warranty and may void insurance coverage in an accident.
ST tires are designed for trailers ONLY — stiffer sidewall for tongue weight + sway resistance, max speed rating typically 65 mph (per Goodyear + Carlisle + Maxxis ST-tire load tables). Many ST tires fail catastrophically when run above 65 mph for extended highway driving. Travel trailers + fifth-wheels + boat trailers + utility trailers use ST tires.
LT tires are designed for light trucks + Class C motorhomes on cutaway-van chassis (Ford E-350 / E-450, Mercedes Sprinter, Ram ProMaster). Most LT tires carry speed ratings of Q (99 mph) or R (106 mph) per the SAE tire-speed-rating standard. The C+/D/E load range on LT tires (per the Department of Transportation specifications) tells you the rated maximum cold inflation pressure: C = 50 PSI, D = 65 PSI, E = 80 PSI.
Commercial truck tires (22.5" + 19.5" wheels) are designed for Class A motorhomes + diesel pushers. These tires carry M (81 mph) or higher speed ratings, load range G or H typical, and require commercial truck pumps to reach the 100-110 PSI cold pressures specified by the manufacturer. Per Michelin XZE2 + Bridgestone R250 + Continental HSR2 specifications, commercial RV tires last 5-7 years OR 100,000+ miles whichever comes first — but the age rule dominates because most RVs never accumulate that many miles.
- ST (Special Trailer) — trailers only · 65 mph max typical · stiff sidewall for sway resistance
- LT (Light Truck) — Class C motorhomes · Sprinter/Transit/ProMaster vans · 99-106 mph speed rating
- Commercial truck (22.5" + 19.5") — Class A diesel pushers · 100-110 PSI cold · 81+ mph rating
- Load range C = 50 PSI max · D = 65 PSI · E = 80 PSI · G = 110 PSI · H = 125 PSI per DOT
- Substituting categories may void warranty + insurance per FMVSS 119/121
Frequently asked questions
Where is the DOT date code on an RV tire?›
Molded into the sidewall as an 8-13 character DOT code starting with 'DOT' followed by a manufacturer + size + plant code, ending in 4 digits that encode the week + year of manufacture. Often only on the inside sidewall.
Can I drive an RV with 8-year-old tires that still have full tread?›
Industry standard per RVIA + NHTSA + Tire Industry Association is to replace at 7 years regardless of tread. 10 years is the hard ceiling. Driving on older tires is at your own risk; insurance carriers may deny claims for tire-age-related failures.
Does PickRV verify tire age on listed rigs?›
PickRV requires hosts to disclose maintenance records including last tire-replacement date as part of the verified-host onboarding process. Renters should still ask the host to confirm DOT codes in writing before pickup; verified-host status doesn't substitute for the renter's own inspection.
What is the load rating on my RV's tires?›
Printed on the sidewall as a 3-digit number followed by a letter (e.g. '116R' means 2,756 lb load at 99 mph speed rating). The sum of all 4-6 tire load ratings must equal or exceed the GVWR on the data plate.
Should I check tire pressure cold or hot?›
Always cold — before driving 1 mile or after the rig has sat at ambient temperature for 3+ hours. Hot tire pressure readings can be 3-8 PSI higher than cold; using a hot reading to set cold pressure leaves the tires underinflated next morning.
Does mileage matter as much as age on RV tires?›
Mileage matters but age dominates for most RVs. A 50,000-mile passenger-car tire wears out tread-wise long before age becomes the issue. An RV tire typically ages out at 5-7 years long before accumulating its wear-life mileage. Per RVIA + Tire Industry Association consensus, the age line trumps the mileage line for any tire on a vehicle that sits outdoors most of the year.
Can I rotate spare into service if the active tires are older?›
Only if the spare's DOT date code is also under the 7-year line. A spare carried in an exterior compartment ages at nearly the same rate as the running tires from UV + heat exposure. Verify the spare's DOT code as part of the same pre-trip inspection.
Continue your research on PickRV
Sources
- 1.NHTSA tire safety + aging researchUS DOT NHTSAgovernment or university source
- 2.FMVSS 110 — tire selection + rims for motor vehiclesUS DOTgovernment or university source
- 3.Tire Industry Association inspection standardsTIAcompany or industry source
- 4.NHTSA TREAD Act — TPMS requirementsUS DOT NHTSAgovernment or university source
- 5.RVIA Recreation Vehicle Industry Association standardsRVIAcompany or industry source
Sources are a mix of government and university publications and the company or industry documentation for the specific equipment, store policy or standard discussed — each row above says which one it is, so you can weigh it yourself. Last verified 2026-06-04. Report broken links to support@pickrv.com.
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