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Within a year the OEM tires on my '15 Premium will be worn to the point I can justify replacing the crappy things. The usual size bump for 17s is 245/50s, but 255s are also possible. This does however severely limit the selection, because it's kind of an oddball size and the usual recommended lines like the Coni DWS are't available. There are however some respectable options like the Nitto Invo (I don't need M+S).

BUT - is a whole extra centimeter really worth it?
 

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2017 Q50 Red Sport 400 RWD
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This is a question that is lacking enough information for us to provide a meaningful answer. What size tires and rims (diameter and width) do you have now? Tell us your factory size tire(s) and your rim width(s), and we can use a tire size calculator to determine the widest tire you can/should get.
 

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I doubt you will be able to notice any difference on 17" wheels. If anything, you'll just have more slop (sidewall movement).
 

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I think thread starter has 17" with 245/50 – I wouldn't expect a different feeling or visual appearance...
 

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The stock size is 225/55/17, 245/50 are almost perfect, 255 would be 1 1/2 off but still good. I would stay with 245.
 

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The stock size is 225/55/17, 245/50 are almost perfect, 255 would be 1 1/2 off but still good. I would stay with 245.
I concur with the Domster.

90572
 

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Invest in 19's while you're at it 😁

 

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A wider tire will also result in less "stretch" to the tire and offer more protection to the wheel when encountering a curb. The OE tire size on my 19s is a look I do not care for in addition to exposing the wheel to greater potential for scrapes. A 265 as opposed to a 245 (in my case) would look better in my opinion.
 

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2018 Q50 AWD Red Sport
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A wider tire will also result in less "stretch" to the tire and offer more protection to the wheel when encountering a curb. The OE tire size on my 19s is a look I do not care for in addition to exposing the wheel to greater potential for scrapes. A 265 as opposed to a 245 (in my case) would look better in my opinion.
This is an issue with the 245 DWS 06 tires on the 9" OEM RS wheels. That tire width doesn't protect the wheel much at all and I wish I had gone with 255 instead.
 

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A wider tire will also result in less "stretch" to the tire and offer more protection to the wheel when encountering a curb. The OE tire size on my 19s is a look I do not care for in addition to exposing the wheel to greater potential for scrapes. A 265 as opposed to a 245 (in my case) would look better in my opinion.
With 265 on the factory 19x9, the steering response is horrible.

I had Michelin PS 4s 265/35/19 on factory 19x9 and it was not that good. I had to switch to my current 19x9.5 just to remove all the slop out of the sidewall.

If anyone runs a 265/35 on 19x9, please use a tire with a very stiff sidewall.
 

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The sport rims with 255/40/19 work well and are just a little shorter than OEM 17s at 26.5”
I went wider to protect the rim and made sure I brought tires with rim-guard beads.
Put my 17s on my wife’s Altima with 225/55/17s. Nice positive offset, looks great, protects rim at 26.25”
 
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