205/75 R14 doesn't belong to the most popular dimensions for summer tyres - there are 2 tyre models available, which can be compared to 155/60 R15, 170/60 R17, 160/60 R14. Let's break down the sizing - 75 is height of the tyre, which is calculated as 75% of the tyre width (205mm), which means the sidewall height has 153.75 mm. The wheel diameter is R14, which means it fits to a 14 inch/355.6mm diameter wheel. The total circumference of the tyre is 2083.19 mm, which is very similar to 225/40 R19(2081.62 mm), 215/60 R16(2087.27 mm), 255/45 R17(2077.54 mm), 255/40 R18(2077.22 mm), 255/35 R19(2076.91 mm), 255/30 R20(2076.59 mm), 225/35 R20(2090.73 mm). There are multiple speed indexes available for summer tyres in 205/75 R14: R(170km/h). The same goes for weight indexes: 109.