Falken EuroWinter HS01 is a winter tyre made in total of 166 sizes, ranging from R13 to R13 - this particular dimension is R21, which means it fits to a 21 inch/533.4mm diameter wheel. 245/40 R21 is 90mm wider than the narrowest dimension (155) and 30mm narrower than the widest one (275). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (245mm), which results in 98mm sidewall height. In 245/40 R21, there is only one possible speed index for Falken EuroWinter HS01 - "V", which is good for speeds up to 240 km/h.
AutoMotorSport Winter tyre test 2022 245/45 R19 sufficient Ranked #8 of 8The Falken EuroWinter HS01 tire secured the final spot, finishing 8th out of 8 participants, and was given a final rating of 'Sufficient' in its evaluation. The tire showcased a commendable wet performance with exceptional aquaplaning safety but had slight shortcomings in cornering grip. It offered a safe and predictable driving dynamic on dry roads and a comfortable ride. However, its performance was criticized for long braking distances, sluggish steering response, and limited grip on snow, along with noticeable noise when cornering. Despite these drawbacks, the tire stood out for its aquaplaning resistance in both cross and longitudinal tests, along with its handling on dry and wet surfaces, positioning it as the most economically priced option amongst its competitors.