Evening all, 

 

Picked up my 2014 Octavia VRS last week and its running 235/40/R18's all round on the Gemini wheels. Not sure at what point or why the change was made. 

 

Having done some Googling and researching on here, it should be running 225/40/R18's? Is this going to cause me any untoward issues? Do I need to revert back? 

 

I need to replace two due to them having cracks, so obviously the garage has priced up 235's. 

 

Mind.......blown haha!

 

Jimski

2 hours ago, Jimski said:

Evening all, 

 

Picked up my 2014 Octavia VRS last week and its running 235/40/R18's all round on the Gemini wheels. Not sure at what point or why the change was made. 

 

Having done some Googling and researching on here, it should be running 225/40/R18's? Is this going to cause me any untoward issues? Do I need to revert back? 

 

I need to replace two due to them having cracks, so obviously the garage has priced up 235's. 

 

Mind.......blown haha!

 

Jimski

 

Gemini alloy rims have a specification of 7.5Jx18.

 

As you can see from the below chart, 235/40R18 has an ETRTO approved minimum rim width of 8J. So officially 7.5J is too narrow.

 

However, I doubt you will have any problems running 235/40R18 on a 7.5J rim apart from the questionable legality, as the wider but higher aspect ratio 245/45R18 can be fitted to a 7.5J rim.

 

The 235/40R18 may have been fitted for cosmetic reasons. Many VRS owners simply like the look of wider tyres. It could have been fitted to help improve ride comfort and improve resistance to pothole damage and improved resistance to kerbing damage.

 

The 235/40R18 tends to be a more expensive tyre size than 225/40R18, so cost considerations are not in favour of the wider tyre.

 

ETRTO approved rim widths

225/45R18 7.0-7.5-8.5
235/45R18 7.5-8.0-9.0
245/45R18 7.5-8.0-9.0

225/40R18 7.5-8.0-9.0
235/40R18 8.0-8.5-9.5

245/40R18 8.0-8.5-9.5

 

Edited 21 March, 20232 yr by Carlston

The correct tyres for Gemini rims should be 225/40 R18

 

Obviously if you were only planning on changing 2 of 4 tyres, then can't really run with mixed sizes.

 

I am guessing it is an everyday use car, rather than something for exciting drives on warm sunny days.   If so seriously consider changing all 4 tyres and putting all season tyres on.

Been reading through the is topic. 
 

Has anyone tried a 245/40/R19 tyre on their Skoda Octavia VRS’s? 
 

I’ve a Skoda Octavia VRS 2019 TDI 4x4 DSG on the 19” wheel and would love to put these on. 

245/40 R19 are 678mm diameter, about 42mm bigger than 225/40 R18

 

An extra 21mm is likely to hit bodywork at certain suspension moves when hitting bumps

I see a lot of folk put on a 235/40/R19 size tyre and seem to get good results. So by that measure a 245/35/R19 tyre would likely be okay? 

What is it you are trying to achieve, is it that you, like many others, are only interested in the looks of the tyre and wheel to car cosmetics and not that bothered about practicalities of real world driving?

 

If the website is correct it shows the 2017-22, 184ps, 2l, diesel on optional 19" (7.5Jx19 ET51) wheels with 225/35ZR19, 88Y tyres (to me 19" are a silly size and 225 and particularly 35% aspect ratio silly but it's not my car).

 

Comparing those tyres against 245/35/R19 -

 

 

Have you looked at, and/or asked, in Skoda Octavia and Skoda Mk III (2013 - 2020) forums for owners options and experiences, many owners look to reduce wheel size to get bigger sidewalls to the tyres, perhaps not as many VRS owners. - https://www.briskoda.net/forums/forum/169-škoda-octavia/

 

Edited 18 November, 202418 Nov by nta16
add hyperlink

29 minutes ago, nta16 said:

What is it you are trying to achieve, is it that you, like many others, are only interested in the looks of the tyre and wheel to car cosmetics and not that bothered about practicalities of real world driving?

 

If the website is correct it shows the 2017-22, 184ps, 2l, diesel on optional 19" (7.5Jx19 ET51) wheels with 225/35ZR19, 88Y tyres (to me 19" are a silly size and 225 and particularly 35% aspect ratio silly but it's not my car).

 

Comparing those tyres against 245/35/R19 -

 

 

Have you looked at, and/or asked, in Skoda Octavia and Skoda Mk III (2013 - 2020) forums for owners options and experiences, many owners look to reduce wheel size to get bigger sidewalls to the tyres, perhaps not as many VRS owners. - https://www.briskoda.net/forums/forum/169-škoda-octavia/

 

Thanks for the reply! 
 

I prefer the look of wider tyres definitely but also their performance enhancements. 
The taller sidewall is purely to give the wheel a slight bit more protection for when I inevitably hit one of the many small craters on my local roads. 
 

Ideally I would like to run the car on the 18”x8” Extreme Diamond Cut wheels but tbh I don't want to spend £500 on a new set and then have to sell the old set. 
I’m just trying to feel out what the widest tyre with the highest sidewall profile on a 19” wheel I can fit on my car lol. 

Hi Folks,

 

I’ve just bought a 2019 Skoda Octavia VRS Estate TDI 184ps 4x4.

Ideally I would like to run the car on the 18”x8” Extreme Diamond Cut wheels with a 245/45/R18 but tbh I don't want to spend £500 on a new set and then have to sell the old set. 
I’m just trying to figure out what the widest tyre with the highest sidewall profile on a 19” wheel I can fit on the car is. 
I had set my sights on the 245/40/R19 and wondering if anyone has any experience with this size? I some folks have had success with a 235/40/R19. 

1 hour ago, JackHenry said:

I prefer the look of wider tyres definitely but also their performance enhancements. 
The taller sidewall is purely to give the wheel a slight bit more protection for when I inevitably hit one of the many small craters on my local roads. 

Within a certain range of sizes the performance isn't really about the dimensions, a smaller, narrower higher sidewalled tyre could be better performance it's all about the design, build, construction and compounds.  Also different sizes will preform differently on different road conditions in different environments and conditions.  Tyres like anything else on the car are full of compromises to meet the varying conditions they'll be subject to.  You may not believe it but 7.5" rims and 225 wide tyres are already overwide for what is actually required, already firmly a fashion choice by VW - but as always each to their own, good luck.

 

10 hours ago, JackHenry said:

Hi Folks,

 

I’ve just bought a 2019 Skoda Octavia VRS Estate TDI 184ps 4x4.

Ideally I would like to run the car on the 18”x8” Extreme Diamond Cut wheels with a 245/45/R18 but tbh I don't want to spend £500 on a new set and then have to sell the old set. 
I’m just trying to figure out what the widest tyre with the highest sidewall profile on a 19” wheel I can fit on the car is. 
I had set my sights on the 245/40/R19 and wondering if anyone has any experience with this size? I some folks have had success with a 235/40/R19. 

 

Unlike two wheel drive, powerful 4x4 cars don't need particularly wide tyres to get good traction off the line.

 

The late model diesel Octavia MK3 VRS cars changed their front brake discs from 340x30mm (which need 17" rims to clear the front brake calipers) to 312x25mm (which need 16" rims to clear the front brake calipers).

 

If you want high performance, choose the right tyre for the conditions. Perhaps Continental PremiumContact 7 for the summer, Continental AllSeasonContact 2 for a mild winter, or Continental WinterContactTS870 for a very cold/snowy winter. A high performance summer tyre becomes a low performance winter tyre when the temperature drops much below 7 degrees Centrigrade.

 

Unsprung weight can have a big effect on the handling of a car, especially when the road is bumpy.

 

To give you an idea of the potential weight savings of using smaller diameter rims, see the below chart. Figures are only approximate because each rim model will be slightly different.

 

Approximate weight of alloy rims for Octavia MK3

16" rims 9kg

17" rims 11kg

18" rims 13kg

19" rims 15kg

 

Steel rims often weigh less than alloy rims of the same specification. For example, the following steel rims all weigh about 7.6kg.

 

16" steel rims that weigh about 7.6kg

6Jx16 ET43 5/112 57.1 (from Karoq)

6Jx16 ET48 5/112 57.1 (from Octavia MK3)

6.5Jx16 ET43 5/112 57.1 (from Audi A3)

6.5Jx16 ET46 5/112 57.1 (from Octavia MK3)

 

Edited 18 November, 202418 Nov by Carlston

When "summer" tyres where just called tyres generally it was said that the tyres would lose performance at 10c, of course different tyres may be affected differently at different thresholds but if you drive a car without all the electronic aids and driver assists and the remoteness of modern cars to the driver you would feel the tyres and roadholding and handling differences in different weather - and using different sizes of weights of wheels and tyres.  Obviously this is less noticeable in a heavy, longer, modern car like the 2019 Octavia 4X4 with all its modern aids and assists and suspension, though the potholes are still felt, but not as much so it shows how bad the potholes actually are.

 

The potholes (and kerbs) don't just effect the wheels they can also damage the tyres (as well as suspension of course) so more insulation from the potholes provided by 'rubber' and air of the tyres the better.