225/40 R16 doesn't belong to the most popular dimensions for winter tyres - there are 0 tyre models available, which can be compared to 155/60 R15, 170/60 R17, 160/60 R14. Let's break down the sizing - 40 is height of the tyre, which is calculated as 40% of the tyre width (225mm), which means the sidewall height has 90 mm. The wheel diameter is R16, which means it fits to a 16 inch/406.4mm diameter wheel. The total circumference of the tyre is 1842.23 mm, which is very similar to 165/70 R14(1842.86 mm), 205/50 R15(1840.97 mm), 195/40 R17(1846.63 mm), 185/55 R15(1836.26 mm), 195/60 R14(1852.28 mm), 175/65 R14(1831.86 mm), 195/45 R16(1828.09 mm).