The czech low-cost tire has high projected mileage and is good on snow, but lacks a bit of wet and dry performance. Pricewise, it can match the low-cost chinese tyres and in comparison, it's definitely a better option.
135/80 R13 doesn't belong to the most popular dimensions for winter tyres - there are tyre models available, which can be compared to 325/30 R21, 155/60 R15, 155/65 R13. Let's break down the sizing - 80 is height of the tyre, which is calculated as 80% of the tyre width (135mm), which means the sidewall height has 108 mm. The wheel diameter is R13, which means it fits to a 13 inch/330.2mm diameter wheel. The total circumference of the tyre is mm, which is very similar to 225/60 R16(2124.97 mm), 305/25 R20(2075.02 mm), 235/30 R20(2038.89 mm), 235/45 R19(2180.58 mm), 235/55 R20(2408.03 mm), 235/75 R15(2304.36 mm), 160/60 R15(1800.13 mm). There are multiple speed indexes available for winter tyres in 135/80 R13: T(190km/h). The same goes for weight indexes: 70.