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Is tyre upsizing legal in India?

The honest short version: The Motor Vehicles Act never mentions tyres by name — Section 52 bars alterations that change a vehicle's basic features from the manufacturer's specification, and the 2019 Supreme Court judgment hardened that principle without ruling on tyre sizes specifically. A modest upsize within the manufacturer's own approved-sizes list, keeping load index and speed rating equal or higher, sits at the mild end of the grey zone; big diameter jumps, protruding tyres, and upsizes bundled with lifts draw the most objections. Enforcement varies by state and RTO, and the most common real-world consequence is at insurance-claim time — so ask your RTO and insurer before you buy, not after a crash.

What the law actually says

The rule everyone argues about is Section 52 of the Motor Vehicles Act, 1988. In plain English: you cannot alter a vehicle so that its details no longer match what the manufacturer originally specified and what is recorded in your Registration Certificate (RC). The section's own explanation defines 'alteration' as a change in the structure of the vehicle that changes a basic feature — you can read the exact text on the government's India Code site (https://www.indiacode.nic.in/show-data?actid=AC_CEN_30_42_00009_198859_1517807326286&sectionId=28325&sectionno=52&orderno=55). Notice what the law does NOT say: it never mentions the word 'tyre'. Whether a tyre size change counts as 'a change in structure that changes a basic feature' is exactly where the debate lives. A one-step upsize on the same rim is physically reversible in an hour at any tyre shop, which is why many owners don't think of it as an 'alteration' at all — but that is an owner's reading, not something the statute or a court has clearly said.

What the Supreme Court actually decided in 2019

In January 2019, in Regional Transport Officer v. K. Jayachandra (a Kerala case about rebuilt bus bodies), the Supreme Court held that a vehicle cannot be altered so that its particulars differ from what the manufacturer originally specified — state rules cannot water down Section 52 (judgment text: https://indiankanoon.org/doc/22832301/; coverage: https://www.livelaw.in/top-stories/vehicles-cannot-be-altered-to-change-manufacturer-specifications-141981 and https://www.scconline.com/blog/post/2019/01/09/original-specifications-made-by-the-manufacturer-of-the-vehicle-cant-be-altered-sc/). Two honest caveats. First, the case was about structural body alterations, not tyres — tyres were not the question before the court. Second, the court itself said changes that do not alter a vehicle's basic features fall outside 'alteration'. So the judgment hardened the general principle ('stick to manufacturer specification') without ruling on where a modest tyre upsize sits. Commentary since then pulls both ways, which is precisely the grey zone owners live in.

Manufacturer-approved sizes, load index and speed rating

The technical baseline sits in Rule 95 of the Central Motor Vehicles Rules, 1989: tyres must meet the notified Indian Standards, and selection and fitment must follow AIS-051 (for cars/SUVs), which is built around the sizes the vehicle maker approves (rule text in the official CMVR compilation: https://cgtransport.gov.in/Notification/CMVR_1989.pdf; MoRTH's CMVR page: https://morth.gov.in/print/1465). Practically, your safest reference is the owner's manual and the tyre placard on the door sill. Many manufacturers list more than one approved size — an upsize that appears there is the least contestable kind. Two numbers matter regardless of size: the load index (how much weight each tyre can carry) and the speed rating (its maximum sustained speed). Tyre makers such as Vredestein, and tyre-guide publishers, advise that you may go equal or higher on both, never lower, than what your vehicle specifies (see Vredestein's guide: https://www.vredestein.co.in/content-hub/tyre-guide/car-suv-van/meaning-of-tyre-speed-and-load-ratings/ and https://www.tyremarket.com/tyremantra/what-is-load-index-and-speed-rating-for-tyres/); we have not surveyed every maker, but we found none advising otherwise. Dropping below the specified load index is the change tyre-industry guidance warns against most clearly as a genuine safety compromise. It is reasonable to expect an RTO, insurer or surveyor to take the same dim view of an under-rated tyre — but we could not find a published RTO or insurer statement saying so expressly, so treat that expectation as unverified.

When RTOs object — and why practice varies

We could not find published enforcement data on how often RTOs actually check tyre sizes on private vehicles. Reported owner experience and law-firm commentary suggest it is rare in day-to-day driving, with the issue typically surfacing at fitness tests (for older or commercial vehicles), during re-registration or interstate transfer, or after a crash — treat that pattern as reported practice, not a documented rule. Law-firm commentary on Indian modification law notes that anything at variance with the RC or manufacturer specification can be questioned, and that enforcement intensity differs from state to state and even RTO to RTO (https://ksandk.com/automobile/legal-governing-modified-cars-in-india-2024/). What tends to draw objections, per that commentary and reported owner experience (colour, not legal authority): big jumps in overall diameter, tyres that stick out beyond the bodywork, and upsizes combined with lifts or rim changes — because those start to look like the structural changes the 2019 judgment addressed. A one-step upsize within the manufacturer's own alternative-size list is at the mild end. We cannot tell you your state's current practice — states differ, and no central list of tolerated tyre deviations exists. That is a question for your own RTO, in writing if possible.

What happens at insurance-claim time

This is where tyre upsizing bites most often in the real world. Insurers treat undeclared modifications that change the vehicle's performance, value or risk as 'material' — and surveyors do note them after an accident. Industry guidance is blunt: an undisclosed material modification can lead to claim rejection even when the modification had nothing to do with the damage, and there are reported instances of claims being denied over tyre and suspension changes that were never notified to the RTO or insurer (https://www.zurichkotak.com/knowledge-center/car-insurance/modified-reality-what-car-modifications-affect-your-insurance-premiums; https://www.smcinsurance.com/motor-insurance/car-insurance/reasons-for-car-insurance-claim-rejections). The fix is cheap and boring: tell your insurer about the size change and get their acceptance in writing (it may nudge your premium). If a claim is rejected and you believe wrongly, you can escalate through IRDAI's Bima Bharosa portal or the Insurance Ombudsman (https://evaakil.com/car-insurance-claim-rejected/). Whether a specific upsize will actually be held 'material' is uncertain and fact-specific — which is exactly why disclosure beforehand beats arguing afterwards.

The RTO endorsement path, if you want it on paper

Where an alteration is permitted with approval, the Motor Vehicles Act framework provides a route: apply to your registering RTO (Form 33 is the alteration form in most states), pass an inspection with the change in place, pay the endorsement fee, and have the RC updated (process described at https://ksandk.com/automobile/legal-governing-modified-cars-in-india-2024/ and https://vahanbazaar.in/tips/legal-car-modifications-india-guide-vahanbazaar). Two uncertainties to flag honestly. First, many owners report that their RC does not record a tyre size at all — we could not find a published, authoritative list of RC particulars confirming this across states, so treat it as unverified and check your own RC rather than taking it on faith. Where no tyre size is recorded, some RTOs will tell you there is nothing to endorse for a modest upsize; others may still want the manufacturer's alternative-size list or an inspection. Second, timelines, fees and willingness to endorse vary by state; the figures quoted online (roughly Rs 300–800 and a few weeks) are indicative, not guaranteed. If your RTO gives you a written position either way, keep it with the vehicle papers — it is the single most useful document if a traffic officer, fitness inspector or insurance surveyor ever raises the question.

Ask your RTO / insurer

  • Does my RTO treat a one-step tyre upsize (same rim, no body or suspension change) as an 'alteration' under Section 52 that needs an endorsement, or as a like-for-like replacement that doesn't?
  • If an endorsement is needed, what exactly do I file — is it Form 33 with a fitness inspection, and what documents and fees apply in this state?
  • Will the upsized tyre size be recorded on my Registration Certificate (RC), and does the RC currently list a tyre size at all for my vehicle?
  • For my insurer: do I need to declare a tyre size change (with the new load index and speed rating) as a modification, and will it change my premium or affect claims?
  • For my insurer: if I fit a size listed as an approved alternative in the manufacturer's owner's manual, is a declaration still required in writing?

Sources

Not legal advice. This guide is general information, compiled from the cited sources on 2026-09-05. Rules differ by state, are enforced unevenly, and change — confirm with your RTO, your insurer, or a lawyer before acting. We never encourage illegal modification or access. Spot an error? Tell our Grievance Officer and we’ll correct it.