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This are the winter wheels my Hyundai-Dealer ordered for my upcoming i30N Performance.
Still have to wait a long time for the car, but the tires are allready here.
 

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Tried to order the brock rc26 but they wouldn't let me because "it won't fit". Can you point out where the official recommendation published?
 
Tried to order the brock rc26 but they wouldn't let me because "it won't fit". Can you point out where the official recommendation published?

I did not find ET recommendation for the 18" rims, but the recommendation is published in the user manual, screenshot of whic can be found in the first post of this thread:
winter-driving.jpg


It's not exactly straight forward, as I imagine you could find 18" rims that wont fit, probably because of ET rather than small inner diameter, I also got a screenshot of service bulletin from my dealer that the recommended winter tyre is Dunlop Winter Sport 5 225/40 R18 92 V, but it was still unclear that this bulletin is 100% meant for the Performance version too.

When they did the 0 service on my car before pickup they fitted 18" wheels on the car and gave me confirmation there will be no issues...

For some reason many sites have the specs for the i30N Performance that only 19" are possible, and I suppose many sellers will look into those specs and claim 18" won't fit, which is clearly not true - many people on the forum alread have 18" rims installed.

Hope this helps
 
Tried to order the brock rc26 but they wouldn't let me because "it won't fit". Can you point out where the official recommendation published?
In Germany all 18" wheels sold by Hyundai for i30N are ET49.5 or ET50 if that's official enough. :)
 
In Germany all 18" wheels sold by Hyundai for i30N are ET49.5 or ET50 if that's official enough. :)
I do have some doubts, why would they choose 49.5/50 ET and change the scrub radius? For the wheels to look equally flush to those 19"? wouldn't it be better to have the same ET?
 
It's only 1.3mm if I read this correctly.

IMG_20181031_121110.jpg
 
Do people in the UK change to winter tyres? Seems like a lot of effort / money getting 18inch alloys and tyres for the minimal amount of snow we get.
 
It's only 1.3mm if I read this correctly.

View attachment 3797
Yes, so it's nearly same flush as the 19" wheel, but the scrub radius is changed to (more?) positive by about 7 mm. I don't know the original scrub radius or how significant this change is for handling properties, but I'd suspect the car was tuned pretty cautiously for impressive handling, so why would the 18" wheels be set up for same look and not same scrub radius?

1540984785248.png
 
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Do people in the UK change to winter tyres? Seems like a lot of effort / money getting 18inch alloys and tyres for the minimal amount of snow we get.
I'm from Poland, we do get proper winters here, even tho less each year it would seem, and I was looking to change to 18" summer tyres in the end, once the pirellis are gone.
 
They are 49.5. at last the ones I bought from Hyundai are. What I noticed after looking at other tuv certificates is that all ETs below that require some (in most cases minor) bodywork. With the 225/40R18 and ET 49.5 its Mount and forget.
 
Do people in the UK change to winter tyres? Seems like a lot of effort / money getting 18inch alloys and tyres for the minimal amount of snow we get.

It's not just about snow... better to think of them as cold-weather tyres. Different compound (more silicon usually), behaves better below ~7°C.

I've used them for a few winters now and they do make a big difference. This last week, I can really notice the stock P Zero triggering ABS very easily.
 
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It's not just about snow... better to think of them as cold-weather tyres. Different compound (more silicon usually), behaves better below ~7°C.

I've used them for a few winters now and they do make a big difference. This last week, I can really notice the stock P Zero triggering ABS very easily.
THIS