Start with the tyre placard in the door shut or fuel flap, then match the load index and speed rating shown there. Many vehicles using this 23-inch size require higher load ratings, often with an XL marking, so do not downgrade even if the tyre looks the same. If your current tyres have a specific rating (for example, XL or a particular speed symbol), keep that the same unless your vehicle handbook states otherwise.
Summer tyres are the best choice for UK drivers who mainly face mild conditions and want sharper braking and cornering on warm, wet roads. Winter tyres make sense if you regularly drive in colder regions or on untreated roads, as the compound and tread are designed to work below about 7C. All-season tyres suit mixed conditions and convenience, but check availability in this size as options can be more limited than in smaller diameters.
Replacing as a pair on the same axle is usually the safest approach, because it keeps grip and rolling behaviour consistent during braking and cornering. If you must replace one, match the exact model, specification and rating, and ensure the tread depth difference across the axle is small to avoid handling issues. On AWD vehicles, also check your manufacturer guidance on maximum permitted tread depth variation.
Rim width matters as much as diameter, because the tyre must sit correctly to deliver stable handling and even wear. A 275/35 R23 is commonly suited to wider 23-inch rims, but the acceptable rim width range depends on the specific tyre model. Check the wheel width stamped inside the rim, then confirm compatibility with the tyre manufacturer data before ordering.
XL (reinforced) versions are common in this size because it is frequently fitted to heavier SUVs that need higher load capacity. Run-flat availability depends on brand and pattern, and some vehicles are not approved for run-flats unless they were specified from the factory. When browsing, filter by XL or run-flat only if your vehicle placard, handbook or existing tyres confirm that specification.
