Why Tata Altroz spare wheels are smaller than other whels?

The Tata Altroz uses a smaller spare because it is a space-saving spare wheel, not a full-size road wheel. brochure lists of Tata the main tyres as 185/60 R16 on many variants, while the spare is 165/80 R14, which helps save boot space and weight. In real use, that means the spare is mainly for temp