285/35 R18 doesn't belong to the most popular dimensions for allround 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 - 35 is height of the tyre, which is calculated as 35% of the tyre width (285mm), which means the sidewall height has 99.75 mm. The wheel diameter is R18, which means it fits to a 18 inch/457.2mm diameter wheel. The total circumference of the tyre is 2063.08 mm, which is very similar to 225/50 R17(2063.4 mm), 205/55 R17(2064.97 mm), 160/70 R17(2060.26 mm), 295/25 R20(2059.31 mm), 245/30 R20(2057.74 mm), 245/35 R19(2054.92 mm), 195/70 R15(2054.6 mm).