# Which tire is wider, 235 or 225? The 235 is wider. The first number in a tyre size marking is the nominal section width in millimetres, measured between the inner and outer sidewall, so 235 means nominally 235 mm and 225 means nominally 225 mm. That makes the 235 tyre 10 mm wider. On a UK tyre sidewall, the size is written in a pattern such as 205/55 R17 91V. The first of the two numbers separated by the slash is the nominal section width, given in millimetres, and it defines the distance between the inner and outer sidewall of the tyre. So when you compare 235/55 R19 with 225/55 R17, the difference in the first number is purely a difference in nominal width: 235 mm versus 225 mm. The other numbers carry separate meanings and do not change this one. References: [https://www.michelin.co.uk/auto/advice/tyre-basics/tyre-markings-explained](https://www.michelin.co.uk/auto/advice/tyre-basics/tyre-markings-explained). ## What the rest of the size marking tells you The second number is the aspect ratio, expressed as a percentage of the tyre's width, so the sidewall height depends on both this figure and the width. The letter R indicates radial construction, and the number after it gives the wheel diameter in inches that the tyre is designed to fit. Additional letters can indicate usage, such as C for a van commercial tyre or XL for a higher load capacity than normal for that dimension. A separate number-and-letter pair, like 91V, gives the load index and speed rating. References: [https://www.michelin.co.uk/auto/advice/tyre-basics/tyre-markings-explained](https://www.michelin.co.uk/auto/advice/tyre-basics/tyre-markings-explained). ## A worked example Suppose, purely as an illustration, your current tyres read 225/50 R17 and you are considering a 235/55 R19 you saw listed online. The 235 option is nominally 10 mm wider, but it is not simply a wider version of your tyre: the profile percentage is different and the rim diameter is two inches larger, so it would not fit your existing wheels. Width alone is never enough information to judge a swap. You need to match width, profile and rim size together, and Michelin also notes that if your car was originally fitted with OE-marked tyres, replacements should be the correct OE-marked versions. References: [https://www.michelin.co.uk/auto/advice/tyre-basics/tyre-markings-explained](https://www.michelin.co.uk/auto/advice/tyre-basics/tyre-markings-explained). ## A checklist before you buy - Match width, profile and rim size to the marking on your current sidewall. - Check the load and speed ratings, and replace reinforced tyres like XL or HL with equivalents. - Compare fitted totals and delivery charges separately from the per-tyre price. - Confirm today's price and availability with the retailer before ordering, since recorded prices are dated observations. References: [https://www.michelin.co.uk/auto/advice/tyre-basics/tyre-markings-explained](https://www.michelin.co.uk/auto/advice/tyre-basics/tyre-markings-explained), [https://tyrescompared.co.uk/](https://tyrescompared.co.uk/). One thing worth knowing: the width number tells you the nominal width and nothing more. It does not establish that a wider tyre performs better or worse on any given car. Handling, comfort and rolling resistance depend on the specific tyre model and the vehicle, so treat the extra 10 mm as a fitment question first. On the Tyres Compared catalogue, both 225 and 235 appear as selectable widths, and popular recorded sizes include both 225/45 R17 and 235/55 R19, each with hundreds of variants from multiple brands. References: [https://www.michelin.co.uk/auto/advice/tyre-basics/tyre-markings-explained](https://www.michelin.co.uk/auto/advice/tyre-basics/tyre-markings-explained), [https://tyrescompared.co.uk/](https://tyrescompared.co.uk/). Your next step: read the full size marking off your tyre's sidewall, then search that exact size, such as 225/50 R17, rather than browsing by width alone. That keeps the profile, rim and ratings consistent with what your car was designed for. References: [https://www.michelin.co.uk/auto/advice/tyre-basics/tyre-markings-explained](https://www.michelin.co.uk/auto/advice/tyre-basics/tyre-markings-explained), [https://tyrescompared.co.uk/](https://tyrescompared.co.uk/). ## Sources - [https://www.michelin.co.uk/auto/advice/tyre-basics/tyre-markings-explained](https://www.michelin.co.uk/auto/advice/tyre-basics/tyre-markings-explained) — accessed 2026-10-18 - [https://tyrescompared.co.uk/](https://tyrescompared.co.uk/) — accessed 2026-10-18 Published 2026-10-18. Tyres Compared editorial; AI-assisted preparation. ## Next step - [Open tyrescompared.co.uk](https://tyrescompared.co.uk/) - [Find tyres](https://tyrescompared.co.uk/sizes) - [Explore this tyre ↗](https://tyrescompared.co.uk/tyre/205-55-r16--g03528703987703) - [⇄ Compare 0](https://tyrescompared.co.uk/compare)