Running oversized tires is one of the most popular truck and Jeep modifications in the US — and one of the most commonly done wrong. The difference between a clean upsizing build and a rubbing, shaking, inaccurate-speedometer mess comes down to understanding a few critical factors before you order.
Why people upsize tires
Ground clearance: larger diameter tires raise the body, improving clearance over rocks and terrain.
Capability: wider and taller tires offer a larger footprint for better traction in soft terrain.
Aesthetics: the clean, aggressive look of a truck or Jeep with oversized tires fills the wheel wells.
How much lift do you need?
Stock: most trucks and body-on-frame SUVs can fit 1–2 sizes up from OEM without any modification — typically 1/2 to 3/4 inch taller.
Leveling kit (2 inches): adds 2 inches of front lift to level the nose. Allows 33–35 inch tires on most 1/2-ton trucks.
3–4 inch suspension lift: allows 35–37 inch tires on most trucks with appropriate backspacing adjustments.
6-inch suspension lift: allows 37–40 inch tires on most trucks. Requires UCAs (upper control arm replacement) on most modern independent front suspension setups.
Rule of thumb: tire diameter increase ÷ 2 = additional lift needed. Going from 31s to 35s (4-inch increase) = approximately 2 additional inches of lift.
Speedometer error and TPMS calibration
Speedometer: a larger tire rotates fewer times per mile — your speedometer will read slow. A 33-inch tire on a truck calibrated for 31-inch OEM tires reads about 6% slow. At 70 mph actual speed, the speedometer shows 66 mph.
Fixing it: most modern trucks have a tire size programming option through the instrument cluster, dealer scan tool, or aftermarket programmer (SCT, DiabloSport, etc.). This is not optional — driving with a significantly incorrect speedometer is an accurate-odometer, insurance, and legal issue.
TPMS: oversized tires may require TPMS sensor reprogramming, especially if wheel size changes.
What else changes with oversized tires
Fuel economy: bigger tires are heavier — rotating mass increases — and wider tires have more rolling resistance. Expect 1–3 MPG reduction per tire size step up.
Acceleration: heavier rotating mass reduces 0–60 times and off-the-line acceleration.
Braking: more rotating inertia means longer stopping distances. More important than many drivers realize.
Differential stress: running oversized tires on an AWD or 4WD vehicle without recalibration stresses the drivetrain. Tires must match across all four.
Rubbing: check for rubbing at full lock turn (both directions) and with maximum suspension compression. Better to know before your first hard turn than during.
Frequently asked
Can I put 33-inch tires on a stock truck?
Depends on the truck. Many newer 1/2-ton pickups (F-150, Ram 1500, Silverado 1500) can fit 33-inch tires with only a leveling kit. Some body styles and suspension designs have more clearance than others. Check your specific model and year — trim and cab configuration matter.
Do bigger tires void my warranty?
Larger tires alone do not void a powertrain warranty. However, if the dealer can show a specific failure was caused by the oversized tires (differential failure from mismatched traction, axle stress from excessive weight), they may deny that specific claim. Suspension lifts are more likely to affect warranty coverage than tires alone.
Keep reading
Last updated 2026-06-27. General guidance only — confirm specifics with a local shop for your exact vehicle.