For a 2021 Hyundai Creta, if you are planning to change both rims and tyres, you can safely upsize from the standard 205/65 R16 to the 215/60 R17S, which is a standard factory option and a common, safe upgrade. The increase width will improve the contact patch, thereby improving road holding, and up-sizing the rims will give a better ride comfort. If you are deciding to retain the same rims, you might consider the 215/60-R-16s as an option as well. Both the 16 and 17 inch options are available from most Indian and imported manufacturers.