Originally posted by greymad
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In any case, I predict that 215/60 R17 wouldn't be noticeably more comfortable than 235/55 R17, because you lose too much width (235 to 215) compared to the gain in height (55 to 60).
It would be better to replace your current summer tyres for an all-season tyre like the Kumho Ecsta LX Platinum (KU27). Or increase the width from 235/55 R17 to 245/55 R17 with the side effect of making the speedometer less underestimate the vehicle's speed.
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Now, I'm not here to tell you what you can and can't do, so if you still want to go ahead, I strongly recommend the tyres are at least able to support the maximum axle weight and the maximum vehicle weight, otherwise there is a serious safety risk.
The standard load version "215/60 R17 96H" has a max. load capacity of 710 kg, so it can support 1420 kg per axle and 2840 kg in total.
The extra load version "215/60 R17 100H XL" has a max. load capacity of 800 kg, so it can support 1600 kg per axle and 3200 kg in total - but this size appears to be exceedingly rare on the market.
So, what are the maximum axle weights (front & rear) and the maximum vehicle weight? The figures should be found on a sticker or a plate on the vehicle itself, maybe somewhere on the pillars.

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