Do aftermarket wheels void your car warranty?

In short. Fitting aftermarket wheels does not, on its own, void a new car warranty in the United States: the Magnuson-Moss Warranty Act forbids a maker from making its warranty depend on parts "identified by brand, trade, or corporate name" unless it supplies them free. What the maker can still do is refuse to pay for a repair when it can show that the wheels caused the fault, for example a wheel bearing worn by a wheel the car was never meant to carry. The United Kingdom reaches a similar place through competition law rather than a warranty statute, and the same causation test appears in the regulator's guidance. Nothing in any of these texts protects a part that the wheels actually damaged.

What the US law says, word for word

The rule is section 102(c) of the Magnuson-Moss Warranty Act, codified at 15 U.S.C. § 2302(c). Its operative sentence reads: "No warrantor of a consumer product may condition his written or implied warranty of such product on the consumer's using, in connection with such product, any article or service (other than article or service provided without charge under the terms of the warranty) which is identified by brand, trade, or corporate name". The Federal Trade Commission can waive the ban only if the warrantor shows that the product "will function properly only if" the named article is used, and the waiver is in the public interest (15 U.S.C. § 2302).

The FTC's interpretation, 16 CFR 700.10(c), applies it to repairs and parts. Its example of a prohibited clause is "This warranty is void if service is performed by anyone other than an authorized 'ABC' dealer and all replacement parts must be genuine 'ABC' parts". It also catches softer wording: a warranty saying "use only 'ABC' replacement parts" is prohibited where the parts are not free under the warranty. The rule was issued in July 1977 and last amended on 20 July 2015 (16 CFR 700.10).

The FTC's own guide for businesses is blunter: "Generally, tie-in sales provisions aren't allowed" (FTC, Businessperson's Guide to Federal Warranty Law). And in its 2021 report to Congress, the Commission gave cars as its first example: the provision "bars an automobile manufacturer from voiding a warranty if a consumer has scheduled maintenance performed by someone other than the dealer" (FTC, Nixing the Fix, May 2021, page 5).

In our reading, a set of wheels from another maker is an "article" in the statute's sense, so a clause saying that non-original wheels cancel the whole warranty is the kind the rule forbids.

What the maker can still refuse: causation

The same rule keeps a door open for the warrantor. The last sentence of 700.10(c) says it "does not preclude a warrantor from expressly excluding liability for defects or damage caused by 'unauthorized' articles or service; nor does it preclude the warrantor from denying liability where the warrantor can demonstrate that the defect or damage was so caused." The FTC guide repeats the point: "it is permissible to disclaim warranty coverage for defects or damage caused by the use of parts or service" that the warrantor did not supply.

Two things follow. The warranty survives for everything the wheels have nothing to do with: an infotainment screen, a window regulator, a battery cell. And the wording "can demonstrate" puts the job of showing the link on the warrantor, according to the text. A dealer who says "you have aftermarket wheels, so nothing is covered" is not applying the rule; a dealer who says "this hub bearing failed because of the load and leverage of these wheels, and here is why" is.

Which parts could a wheel change plausibly reach? The table below is our own reading, not a list from any manufacturer. It shows where a link can be argued, and what each side would need to show.

If you are choosing a size, the car maker's documents set the limits; our guides on how to choose aftermarket wheels and on wheel offset explain what each figure means. Onyx Forged does not recommend a size or an offset.

The rules side by side

The table is ours. Where a cell says we did not find something, that is a limit of our reading, not proof that no rule exists.

United Kingdom: competition law, not a warranty statute

The UK has no direct copy of section 2302(c). The protection comes from the Competition Act 1998 (Motor Vehicle Agreements Block Exemption) (No. 2) Order 2023, made on 26 May 2023, in force from 1 June 2023 and due to cease "at the end of 31st May 2029". It extends to England and Wales, Scotland and Northern Ireland (SI 2023/586).

The Competition and Markets Authority's guidance of 5 June 2023 explains how it treats warranty terms. Paragraph 5.37 says that "Warranty conditions which require the use of spare parts bearing the motor vehicle supplier's brand (OEM parts) in respect of replacements not covered by the warranty terms may similarly be caught by the Chapter I prohibition." It then sets the limit, in the same causation terms as the American rule: the prohibition "does not prevent a supplier of motor vehicles (or any other warranty provider) from legitimately refusing to honour a warranty claim on the grounds that the situation leading to the claim in question is causally linked i) to a failure on the part of a repairer to carry out a particular repair or maintenance operation in the correct manner, or ii) to the failure of a spare part supplied by a third party." Paragraph 5.41 adds that terms which "clearly state the consumer's right to use the services of an independent repairer without losing the benefit of the warranty" are unlikely to raise concerns (CMA Guidance on Motor Vehicle Agreements).

Two limits apply. The guidance is a regulator's view of agreements between car makers and their networks, not a consumer right you can quote at a service desk as an American owner quotes the statute. And it speaks of a third-party part that fails, not of one that damages an original part, the usual wheel case; our reading is that the same causation logic applies, but it is a reading.

Your other UK rights sit in the Consumer Rights Act 2015. A manufacturer's warranty is a "guarantee" under section 30, and it "takes effect, at the time the goods are delivered, as a contractual obligation owed by the guarantor under the conditions set out in the guarantee statement". In other words, its conditions are its own terms; read them. Separately, the dealer who sold you the car owes you a car "of satisfactory quality" under section 9, and section 31 says a term cannot exclude that. For six months after delivery, a fault is taken to have existed on delivery (section 19(14)), unless "it is established that the goods did conform to the contract on that day" (section 19(15)). A dealer who shows that your wheels caused the fault is using exactly that exception. These sections are on legislation.gov.uk.

Canada and Australia

For Canada, we found no federal statute that, like section 2302(c), bans a car warranty from requiring branded parts by name. What you have is the warranty contract itself and your province's consumer protection law. Read the exclusions in your warranty booklet, and if a claim is refused for unrelated reasons, your provincial consumer protection office is the place to ask. We have not read provincial texts for this guide.

For Australia, the Australian Consumer Law gives consumer guarantees that sit beside any manufacturer's warranty. In the compilation of 16 September 2026, section 54 is headed "Guarantee as to acceptable quality", section 64 "Guarantees not to be excluded etc. by contract" and section 102 "Prescribed requirements for warranties against defects" (Competition and Consumer Act 2010). We could not read the full text of those sections, nor the consumer regulator's pages on car servicing and parts, while writing this guide, so we do not quote them. The Australian Competition and Consumer Commission is the authority to check.

Tesla and other published warranties

"Do aftermarket wheels void Tesla warranty" is one of the most common forms of the question. In the United States, a Tesla warranty is a written warranty on a consumer product like any other, so section 2302(c) and the FTC rule apply to it as quoted above. We tried to read Tesla's current New Vehicle Limited Warranty for this guide and could not access it, so we do not quote its wording. Read the "exclusions" or "limitations" section of your own booklet. A clause excluding damage caused by accessories or modifications is the causation exclusion the FTC allows; a clause cancelling the whole warranty because non-original wheels are fitted is the kind it forbids. Our Tesla Model 3 and Model Y wheel guide sets out the figures Tesla publishes.

Tyres can be a separate case: check whether your warranty booklet covers them or sends you to the tyre maker's own warranty before you argue about either.

How a wheel change can be linked to a fault: a worked example

The argument a dealer can make is easier to judge with numbers. Take three tyre sizes as an illustration only, not as sizes for any car. The overall diameter of a tyre is the rim diameter plus twice the sidewall height, and the sidewall height is the width times the aspect ratio:

• 225/45 R17: 17 × 25.4 = 431.8 mm, plus 2 × (225 × 0.45) = 202.5 mm, gives 634.3 mm.
• 225/40 R18: 457.2 mm plus 2 × 90 mm gives 637.2 mm, which is 2.9 mm or 0.46 % larger.
• 235/35 R19: 482.6 mm plus 2 × 82.25 mm gives 647.1 mm, which is 12.8 mm or 2.02 % larger.

At the same wheel rotation speed, a tyre 2.02 % larger covers 2.02 % more ground: when a system calibrated for the first size reads 60 mph, the car is doing about 61.2 mph. A change of 0.46 % is far smaller. Our tyre size calculator does this arithmetic for any pair of sizes. For warranty purposes, the point is that a size change is measurable: both sides can put a figure on it.

Load works the same way: our guide on reading wheel markings shows where a wheel's maximum load is marked. A wheel rated for the car's axle loads, at an offset inside the car maker's range, leaves a dealer less to argue with; the car maker's documents, not this guide, set those figures.

What regulators found in practice

The law has not stopped the problem. In April 2018, FTC staff sent warning letters to six major companies selling cars, mobile phones and game consoles, about statements that "consumers must use specified parts or service providers to keep their warranties intact" (FTC, 10 April 2018). The 2021 report says the recipients changed their practices, but that several organizations reported that warranty tying "continues to be prevalent". It records a U.S. PIRG study of October 2018 that found 45 of 50 companies' warranties appeared to break section 102(c), which is 90 % by our arithmetic. And it records a comment from the Specialty Equipment Market Association that dealers void warranties "if the dealership finds a specialty part (e.g., custom wheels) had been installed on the automobile, regardless of whether the specialty part caused the automobile to malfunction" (Nixing the Fix, page 8). Custom wheels are, in the regulator's own report, the example given.

Before you fit, and if a claim is refused

Before fitting, keep a record that answers a causation argument: wheel size, offset and load rating, tyre size, who fitted them and when, and photographs of brakes and arches with the wheels on. Have the nuts or bolts tightened to the car maker's torque, which our wheel nut torque guide explains. Keep the original wheels if you can. Refitting them before a dealer visit does not remove the question of causation: wear that the other wheels caused is still there to be seen. If anything rubs, vibrates or warns after fitting, have it checked before you drive on.

If a claim is refused:

1. Ask for the refusal in writing, with the reason and the part it concerns.
2. Check whether the reason is a link between your wheels and that part, or only the fact that the wheels are not original. Only the first is a ground the US rule and the CMA guidance accept.
3. In the United States, the Act lets a consumer "damaged by the failure of a supplier, warrantor, or service contractor to comply" bring a suit, and a consumer who "finally prevails" may recover costs "including attorneys' fees based on actual time expended", at the court's discretion (15 U.S.C. § 2310(d)).
4. In the UK, your claim under the Consumer Rights Act is against the dealer who sold you the car, and it runs alongside the manufacturer's warranty.
5. In every country, an independent inspection that addresses the cause of the fault is the evidence that settles these disputes. We are not lawyers, and none of this is legal advice for your case.

Frequently asked questions

Do aftermarket wheels void my warranty in the US?

Not by themselves. Section 2302(c) forbids conditioning a warranty on branded parts unless they are free; the maker can refuse only repairs it can show the wheels caused.

Can a dealer refuse all warranty work because I have custom wheels?

Under the FTC rule, no: a defect unrelated to the wheels stays covered. The FTC's 2021 report records complaints that dealers do exactly this, which is why a written reason matters.

Who has to prove that the wheels caused the damage?

In the US, 16 CFR 700.10(c) lets the warrantor deny liability "where the warrantor can demonstrate" the cause, so, on our reading of the text, the showing is on the warrantor's side. In the UK, within six months of delivery, a dealer relying on section 19(15) of the Consumer Rights Act has to establish that the car conformed to the contract on delivery.

Is the UK any different?

The protection comes from competition law: the 2023 block exemption order and the CMA's guidance say that requiring branded parts may breach the Chapter I prohibition, while a claim causally linked to a third-party part can be refused.

Do aftermarket wheels void a Tesla warranty?

In the US, the same federal rule applies to Tesla's written warranty. We could not read Tesla's current warranty text for this guide; read its exclusions section and check whether it excludes damage caused by modifications or accessories.

What about Canada?

We found no federal equivalent of the US rule. The warranty contract and provincial consumer protection law decide; your provincial consumer office can advise.

Does putting the original wheels back before a service help?

Not with causation: wear caused by the other wheels remains visible. What protects you is a record showing the wheels were within the car maker's figures.

Where to go next

Onyx Forged is a French brand of made-to-order forged wheels, designed to JWL/VIA standards: configure a set.

Sources

• United States: 15 U.S.C. § 2302 and 15 U.S.C. § 2310; 16 CFR 700.10 (as amended 20 July 2015); FTC, Businessperson's Guide to Federal Warranty Law; FTC, warning letters, 10 April 2018; FTC, Nixing the Fix, May 2021.
• United Kingdom: SI 2023/586, motor vehicle block exemption order; CMA Guidance on Motor Vehicle Agreements, 5 June 2023; Consumer Rights Act 2015, sections 9, 19, 30 and 31.
• Australia: Competition and Consumer Act 2010, compilation of 16 September 2026.

All pages were read on 16 October 2026.

The Onyx Forged design office.