225/70 R15 doesn't belong to the most popular dimensions for allround tyres - there are 17 tyre models available, which can be compared to 205/40 R18, 190/50 R17, 205/65 R15. Let's break down the sizing - 70 is height of the tyre, which is calculated as 70% of the tyre width (225mm), which means the sidewall height has 157.5 mm. The wheel diameter is R15, which means it fits to a 15 inch/381mm diameter wheel. The total circumference of the tyre is 2186.55 mm, which is very similar to 265/45 R18(2185.61 mm), 265/40 R19(2182.15 mm), 235/45 R19(2180.58 mm), 215/55 R18(2179.32 mm), 275/30 R21(2194.09 mm), 265/35 R20(2178.69 mm), 195/75 R16(2195.66 mm). There are multiple speed indexes available for allround tyres in 225/70 R15: R(170km/h), S(180km/h), T(190km/h). The same goes for weight indexes: 100, 112. You can find 225/70 R15 on 4 car models - mainly Jeep, Mercedes-Benz, Renault, VW Commercial.