Answers: Stick to 17s. That way, you won't totally verbs the ride quality. Also, larger wheel actually slow the motor down, since it's harder to get them to start rotating - this is why see cars don't use really tall wheel.
Either way, build sure you can get tyres rate for M+S in your size - they can he rock-hard to find when looking for low profile tyres - and sometimes impossible to find in your size - but driving surrounded by snow on summer tyres is no joke, any.
Good luck!
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