235 is the tyre width in millimetres, 60 is the profile (sidewall height as a percentage of the width), R means radial construction, and 17 is the wheel diameter in inches. These measurements need to match your vehicle specification to ensure correct fit and performance.
Use the tyre placard (usually on the driver door frame) or your handbook to match the required load index and speed rating for your exact model. If your vehicle specifies a higher load rating for heavy loads or towing, choose that rating or higher, and avoid fitting a lower rating than recommended.
Only choose XL (extra load, sometimes marked reinforced) if your vehicle originally came with XL in this size or your placard specifies it. SUVs and heavier crossovers often require XL for the correct load capacity and stability, so replacing like-for-like is the safest option.
All-season tyres can be a strong choice in this size if you want one set for year-round use, especially for mixed motorway and rural driving. Look for the 3PMSF symbol if you want improved cold-weather and light snow capability, and consider dedicated winter tyres if you regularly drive in severe winter conditions.
You can, but it is usually better to replace tyres in pairs on the same axle to keep grip and handling balanced. If your vehicle is AWD, check the handbook as some systems require closely matched tread depths, and you may need to replace two or even all four to avoid drivetrain strain.