The first number is the width in millimeters, and the second is the sidewall height as a percentage of that width. So a 235/45 has a 106 mm sidewall. If you drop to 235/30, that shrinks to about 71 mm. The rims will handle it fine since the width stays close, but it’ll affect your speedometer and gearing.
When your original 45s show 120 km/h, the 30s will actually be doing around 109 km/h. The annoying part is your odometer will climb roughly 11% faster than the real distance you’re covering.
Edit: smaller sidewalls also mean less grip and a harsher ride. The contact patch shrinks a bit, so while you’ll lose traction, you might enjoy how much easier it is to kick the rear loose if that’s your thing.
Nokian seasonproof 2 are way to go, nokian is quieter and pattern on them are unique they have central canals for aqualpaning like summer tyres and the treads like winter tyres. I've never seen this before on any allseason tyre brend.
I live in a ski town BC, that averages >30 FEET of snowfall annually. Often roads have caked snow, sluff, sleet & ice. Between dodging tourists, wildlife and staying firmy lodged, I don't dick around. I get the best. Studded Hakka's 10, that just replaced a set that I had about 30-35,000km on.
I run Michelin X-Ice Snow winter tires. They grip really well, while not being so grippy that you can't do some snowy parking lot shenanigans lol.
I just put on a set of Hakka R5s for the winter and the difference in road noise was startling - like driving a whole new vehicle.
Michelin Platinums homerun for me! They have a great side profile similar to Pirelli but the tread is great and absolutley dead quiet and tight road performance...seen no problem in my limited off-road treks, tho longevity, highway manners and looks were my decision priorities.
Michelin Crossclimate 2 - Very good tyre
Cross Climate 2’s are quieter than the OEMs and are better in every measurable metric.
I bought Michelin x-ice stock size, stock alignment. I found it cut a lot of power from wheel spin on a dry warm day. They did handle well in bad weather.
After switch to Defender 2 tires, I lost an instant 20% in efficiency - consistently !!!
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