Will Bigger Tires Void My Truck Warranty?

Short answer: not by themselves, and never all at once. Under the federal Magnuson-Moss Warranty Act, a manufacturer can't void your truck's warranty just because you put on bigger tires. What it can do is deny a specific repair when it can show the bigger tires, or the leveling kit you added to fit them, caused that part to fail. The variable nobody names is how far your setup sits from what the factory itself offers on your truck. A size Ford, GM, Ram, or Toyota already puts on another trim of the same truck is hard to blame for anything. A 35 on a leveling kit puts your ball joints, CV axles, wheel bearings, and steering parts on the table, and on a big jump with no regear, your driveline claims get a closer look. Most answers stop at "they can't void your whole warranty." True. That's the part that won't cost you money.

I'm Dennis Feldman, and I handle fitment at Performance Plus Tire. This question comes in right before almost every truck upgrade we do, and it deserves a straight answer instead of a shrug. One thing up front: I'm a fitment guy, not a lawyer, and nothing here is legal advice. What I can give you is what the federal rules say, what the manufacturers print in their own warranty booklets, and how the parts actually wear when you change the tires.

Bigger Tires and Your Truck Warranty Chart

Find the row that matches what you've changed. The further down the table you go, the more claims a dealer can reasonably tie to your modification.

What You Changed	Warranty Risk	Claims Most Likely to Be Questioned	Why
A tire size the factory offers on another trim of your truck, on stock suspension	Lowest	Hard to tie to anything	The manufacturer engineered and validated that size on your platform
Slightly bigger tires, about 3 percent or less in diameter, stock suspension, no rubbing	Low	Rarely anything; possibly speedometer-related complaints	Small changes in load, gearing, and geometry
Bigger tires plus an aftermarket leveling kit	Moderate	Ball joints, CV axles, tie rods, struts, alignment-related wear	Front suspension angles changed outside factory settings
Lift kit and 35s, wider wheels, no regear	High for the affected systems	Front end, wheel bearings, steering, and a closer look at transmission and axle claims	More weight, more leverage, and taller effective gearing
A factory-backed lift or leveling kit, installed by the dealer	Lowest for the kit itself	Tires larger than the kit's approved size	The kit carries its own manufacturer warranty

By the Part That Fails

Warranty claims are judged one part at a time. This is how the same set of tires can leave one repair fully covered and get another one denied.

Part That Fails	Can Bigger Tires Plausibly Cause It?	What a Dealer Will Look At
Infotainment, power windows, HVAC, interior electronics	No	Nothing about your tires; should be covered as normal
Engine internals	Very unlikely	Maintenance records, not tire size
Wheel bearings and hubs	Yes, with heavier tires and lower-offset wheels	Tire weight, wheel offset, spacers
Ball joints, CV axles, tie rods, struts	Yes, especially with a level or lift	Ride height, suspension angles, kit brand
Transmission, transfer case, axles	Sometimes, after a big size jump with no regear	Diameter change, gearing, towing history
TPMS sensors	Only if the sensors were moved or replaced	Whether the sensors are factory parts
Camera and radar driver-assist systems	Possibly, after a ride-height change	Lift height and whether the sensors were recalibrated

Can a Dealer Void My Warranty for Bigger Tires?

Not the whole thing. The Magnuson-Moss Warranty Act is the federal law that governs consumer product warranties, including new-vehicle warranties. Section 102(c) of the Act prohibits what's called a tie-in: a warrantor can't make your coverage depend on using a branded part or service unless it provides that part or service free. The Federal Trade Commission's rule implementing it, 16 CFR 700.10, says flatly that no warrantor may condition the continued validity of a warranty on using only authorized parts for non-warranty service.

The same rule spells out the other side, and this is the part that matters for your tires. It doesn't stop the warrantor from denying liability for damage caused by the unauthorized part, "where the warrantor can demonstrate that the defect or damage was so caused." The FTC's consumer guidance puts it plainly: simply using an aftermarket part doesn't void your warranty, but if that part causes damage to a covered component, the manufacturer or dealer can deny coverage for that repair. The company has to show the aftermarket part caused the need for the repair.

The FTC Has Enforced This

This isn't theory. In April 2018, FTC staff sent warning letters to six major companies that sell cars, phones, and game consoles, flagging warranty language that told customers to use specific parts to keep coverage. In June 2022, the FTC announced orders against Harley-Davidson and generator maker Westinghouse over warranty terms that conditioned coverage on genuine parts, and required both to fix their warranties and notify customers. The message has been consistent for years: a warranty can't be voided for using parts that didn't come from the manufacturer.

What "Show It Caused It" Looks Like at the Service Desk

In practice, the first person who decides is the service advisor and the dealer's warranty administrator, and they're looking at your truck, not a law book. If your truck comes in with a leaking front CV boot and it's sitting three inches higher with 35s on it, they're going to connect those dots. If it comes in with a dead touchscreen, your tires are irrelevant. The closer the failed part sits to the tires and suspension, the easier it is for a dealer to make the case, and the more your paperwork matters. Our guide to whether aftermarket wheels void your warranty covers the same rule from the wheel side.

What Do Ford, GM, Ram, and Toyota Say About Bigger Tires?

They all say some version of the same thing, and it lines up with the federal rule: changing the truck doesn't wipe out the warranty, but damage the change causes isn't covered. Here's how each one puts it in its own words.

Ford. Ford's warranty guide excludes damage caused by alterations or modifications of the vehicle, including the body, chassis, or components, and damage from a non-Ford part when that part fails or causes a Ford part to fail. It has gone further and named examples outright: "lift kits, oversized tires, roll bars."

GM. Chevrolet's warranty booklet lists alteration or modification of the body, chassis, powertrain, and driveline among the things it doesn't cover, along with damage from installing non-GM parts. It's also specific about the scope: unapproved parts or alterations "will void the warranty coverage for those components that are damaged or otherwise affected." Those components, not the truck.

Ram. Ram's warranty booklet says it directly: "Certain changes that you might make to your truck do not, by themselves, void the warranties." It then lists changing the vehicle's configuration or dimensions among the things it doesn't cover, and says repairs or adjustments caused by those changes aren't covered.

Toyota. Toyota's own parts site, on the listing for its TRD suspension lift kit, warns that "tires and wheel combinations larger than OEM sizes may void the vehicle's warranty." Read that through the federal rule above and the practical meaning is the same as everyone else's: what's at risk is coverage for what those bigger tires and wheels affect.

Booklets change by model year, so pull the one for your truck. It's in the glovebox packet and on the manufacturer's owner site, and the section you want is usually titled something like "What Is Not Covered."

Does a Leveling Kit Void My Truck Warranty?

An aftermarket leveling kit doesn't void the warranty either, but it's the single biggest reason front-end claims get questioned, because it changes suspension angles outside factory settings. Here's where it gets interesting: the manufacturers sell their own.

Ford Performance has sold Fox-based leveling kits for the F-150 and Ranger, and Ford's parts warranty says installation of those select kits by an authorized installer "will NOT void your New Vehicle Limited Warranty." Toyota sells dealer-installed TRD lift kits for the Tacoma and Tundra, and genuine parts installed by a dealer are covered for 12 months or the remainder of the new-vehicle warranty, whichever is longer. Mopar sells lift kits for Jeep models through its dealers too; ask the dealer for the kit's warranty terms in writing before you buy.

The fine print matters. A factory-backed kit covers the kit and keeps the vehicle warranty in place for the kit. It doesn't automatically bless whatever tire you put on it. Toyota's warning about tire and wheel combinations larger than OEM sizes sits right on its own lift kit listing. If you want the cleanest warranty path, stay with the kit's listed tire size, or a size the factory already offers on your truck. If you want to know which sizes clear without a lift at all, see the biggest tire without a lift.

Air Suspension Trucks Need Extra Care

If your truck rides on air, the suspension computer is watching ride height. GM told its technicians in 2021 that aftermarket height-sensor links and lowering kits on some Tahoes, Suburbans, Yukons, and Escalades set off a Service Leveling System message, and that damage or performance concerns from those modifications may not be covered. Raising an air-ride truck with modified height-sensor links puts you in the same conversation from the other direction.

Which Warranty Claims Can Bigger Tires Affect?

The ones physically connected to the tire. Here's the mechanism for each, because a dealer has to be able to explain it too.

Wheel Bearings and Hubs

A bigger tire is heavier, and a wider wheel with lower offset pushes the tire's centerline further outboard of the bearing. Both add leverage on the bearing every time you hit a pothole or turn hard. This is the most common place a big wheel and tire package and a warranty claim collide, and spacers make it worse; see do wheel spacers hurt your car before you add them. Our guide to wheel offset and tire width package fitment shows how far offset moves the load.

Ball Joints, CV Axles, and Steering

On an independent front suspension, a leveling kit or lift changes the angle the CV axles and ball joints run at, all the time. Taller, heavier tires also put more force through the steering system at low speed. Wear on these parts after a ride-height change is the easiest claim for a dealer to tie to a modification.

Brakes

Pads and rotors are wear items that most new-vehicle warranties don't cover anyway. But a heavier, taller tire takes more braking effort to stop, so expect them to wear faster.

TPMS Sensors

The tires themselves don't hurt your sensors. But if your sensors got moved to new wheels, damaged during mounting, or replaced with aftermarket units, a sensor failure may not be a factory warranty claim. Our guide to TPMS sensors for aftermarket wheels covers how to keep them working.

Driver-Assist Cameras and Radar

Raising the front of a truck tips the forward radar and camera up. Calibration specialists say ride-height and tire-size changes can throw those sensors out of calibration, and that manufacturers typically don't provide calibration procedures for ride heights outside factory specs, except for their own approved kits. SEMA's own testing of a 2022 Silverado 1500 with a 2-inch level, and 3.5-inch and 6-inch lifts, found the factory driver-assist features still worked, and SEMA was careful to say that result applies to that one truck. If a lane-keep or emergency braking fault shows up after a lift, expect the conversation to start with your ride height.

Do Bigger Tires Affect the Powertrain Warranty?

Usually not, but a big jump without a regear invites scrutiny. A taller tire acts like a taller final drive ratio. Going from a 31.6-inch tire to a 35 is about an 11 percent jump, which means the transmission and axles see more torque load for the same acceleration, and the transmission may hunt between gears or run hotter when towing. If a transmission or differential fails on a truck towing heavy with 35s and stock gears, expect the dealer to ask about it. A small step inside about 3 percent is a different story; it changes very little. Our guide to regearing after bigger tires covers when a regear is worth it.

Fix the Speedometer, Keep the Receipt

Bigger tires make your speedometer read slow and your odometer log fewer miles than you actually drove. On many trucks, the transmission also uses vehicle speed to decide when to shift. A recalibration fixes all three, and a receipt shows the shop did it right. Our guide to bigger tires and your speedometer explains how far off you'll be at each size.

What a Denied Claim Costs You While You Drive on It

A warranty denial doesn't show up the day you mount the tires. It shows up later, one part at a time, and each rung costs more than the one before it.

1. An alignment that won't hold. Uneven wear on the new tires, and an alignment that's billed to you because the truck is outside factory ride height.
2. A worn tie rod end or ball joint. A few hundred dollars that would have been a warranty repair at stock height.
3. A CV axle or a front wheel bearing. Now it's several hundred to over a thousand dollars per side, and if one side went, the other usually isn't far behind.
4. A driveline repair on a heavily modified truck. The expensive end. If the dealer can tie a transmission or axle failure to a big tire jump and heavy towing on stock gears, that's a bill most owners never planned for.

Every rung is cheaper to avoid than to argue. The easiest way to stay at the top of that list is to pick a size close to what your truck already runs. Our Advanced Tire Size Calculator shows the diameter change, speedometer error, and revolutions per mile for any size you're considering.

How to Keep Your Warranty When You Go Bigger

1. Read your warranty booklet. Find the "What Is Not Covered" section for your model year and see exactly how your manufacturer words it.
2. Start with factory sizes. If another trim of your truck comes on a bigger tire, that size is the safest step up there is.
3. Stay close in diameter. About 3 percent or less keeps load, gearing, and speedometer changes small.
4. If you level, consider the factory kit. A manufacturer-backed kit installed by the dealer carries its own warranty, and some, like Ford Performance's, come with a statement that they won't void the vehicle warranty.
5. Keep offset near stock and skip spacers. That protects the wheel bearings and keeps that claim off the table.
6. Recalibrate the speedometer, and regear on big jumps. Keep the receipts for both.
7. Keep every receipt and keep the stock parts. Installation records, alignment printouts, and your factory wheels and tires make it much easier to put the truck back to stock for a big repair or a trade-in.
8. If a claim is denied, ask why in writing. Ask which part failed and how the modification caused it. Ask for a supervisor, then contact the manufacturer directly. The FTC's guidance also points consumers to their state attorney general or local consumer protection office.

Conclusion

Bigger tires don't void your truck warranty. Federal law has been clear on that for decades, and the FTC has enforced it. What they can do is cost you coverage on the specific parts they can reasonably be blamed for, and every manufacturer's booklet says so in its own words.

The question that decides your risk is how far past the factory envelope you go. A size your truck already comes with on another trim is nearly bulletproof. A modest step on stock suspension is low risk. Add an aftermarket level or lift, wider wheels, and 35s on stock gears, and the front end, bearings, and possibly the driveline become the dealer's call. Keep the change small, keep your paperwork, and you'll keep your warranty doing its job. Run your options through our Advanced Tire Size Calculator before you buy.

Key Takeaways

• Under the Magnuson-Moss Warranty Act, bigger tires can't void your whole truck warranty.
• A manufacturer can deny a specific repair when it can show the tires or a related modification caused that failure.
• Ford, GM, Ram, and Toyota all exclude damage caused by modifications, and Ford's guide has named "lift kits, oversized tires, roll bars" as examples.
• The claims most at risk are wheel bearings, ball joints, CV axles, steering, and, after big jumps with no regear, the driveline.
• Electronics and parts unconnected to the tires should be covered as normal.
• Factory-backed leveling and lift kits installed by a dealer carry their own warranty, but tires larger than the approved size can still be questioned.
• Stay close to factory sizes, recalibrate the speedometer, and keep every receipt.

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