235/80 R16 doesn't belong to the most popular dimensions for summer 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 - 80 is height of the tyre, which is calculated as 80% of the tyre width (235mm), which means the sidewall height has 188 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 2457.98 mm, which is very similar to 275/50 R20(2459.87 mm), 275/45 R21(2453.27 mm), 275/55 R19(2466.46 mm), 315/40 R21(2467.41 mm), 275/40 R22(2446.67 mm), 285/40 R22(2471.81 mm), 265/70 R16(2442.27 mm). There are multiple speed indexes available for summer tyres in 235/80 R16: S(180km/h). The same goes for weight indexes: 109.