Rim protection on 19" extremes

[RoddersUK]

Who has 235s over the standard 225s and is there a lot more rim protection?

 

Wondering if I should put 235s on the rear as they need replacing, then 235s on the front when they are required, or just stick with 225s!?

[Carlston]

3 hours ago, RoddersUK said:

Who has 235s over the standard 225s and is there a lot more rim protection?

 

Wondering if I should put 235s on the rear as they need replacing, then 235s on the front when they are required, or just stick with 225s!?

 

The width of a 225/35R19 tyre fitted to 7.5J rim is about 224mm.

 

The width of a 235/35R19 tyre fitted to 7.5J rim is about 230mm.

 

Therefore, the sidewalls will bulge out by about 3mm more each side if you change from 225/35R19 to 235/35R19 on 7.5J rims.

 

However, ETRTO don't approve the fitment of a 235/35 tyre to a 7.5J rim. They specify an 8J rim as the minimum rim width for that tyre size as shown in the chart below.

 

ETRTO approved rim widths

225/35 7.5-8.0-9.0
235/35 8.0-8.5-9.5

 

Edited 7 January, 2023 by Carlston

[RoddersUK]

So all round not worth it then, though annoyingly they are cheaper!

[Swirly182]

I've had 235s on mine for over 3 years. The Xtreme rim is 8.0J. 

[organicpretzel]

I’ve got 235/35/19s on all corners on my 19” Xtrems 

[Carlston]

9 hours ago, Swirly182 said:

I've had 235s on mine for over 3 years. The Xtreme rim is 8.0J. 

 

According to the Skoda parts catalogue the Xtreme rims are 7.5J. "skoda eshop cz" also shows them as being 7.5J. A tyre fitter could refuse to fit a 235/35 tyre to a 7.5J rim. You might want to check with a local tyre fitter to make sure he would fit a 235/35 tyre to a 7.5J rim before making a purchase. 

 

1	5E0601025AH	Aluminium rim	7,5JX19 ET51	4	PR-CW6 XTREME	-
	5E0601025AHHA7	Anthracite metallic (grey)
1	5E0601025BD	Aluminium rim	7,5JX19 ET51	4	PR-C8I XTREME
	5E0601025BDJX2	black/bright chrome

https://www.lllparts.co.uk/catalogs/skoda/CZ/OCT/753/6/601/601090

X-TREM 19" light alloy wheel for OCTAVIA III RS

Rim size: 7.5J x 19" ET 51

https://www.lllparts.co.uk/catalogs/skoda/CZ/OCT/753/6/601/601090

 

Edited 7 January, 2023 by Carlston

[Swirly182]

https://skodapartsdirect.co.uk/product/skoda-octavia-2013-2020-19-xtrem-alloy-wheel-black/

 

I used this information, apologies if it's incorrect. 

[RoddersUK]

Well when my wheels turn up, I'll measure them!

Then we'll know for sure lol.

[Mikeyd1]

Hmm I think maybe the grey version is 7.5 and the black 8 for some reason unless it’s got something to do with the mk3 facelift having a wider rear track??

[Carlston]

45 minutes ago, Swirly182 said:

https://skodapartsdirect.co.uk/product/skoda-octavia-2013-2020-19-xtrem-alloy-wheel-black/

 

I used this information, apologies if it's incorrect. 

 

There's a lot of incorrect information on that listing.

 

They claim its an 8Jx19 ET41 rim that needs a 235/45R19 tyre for the Octavia MK3.

 

It's actually a 7.5Jx19 ET51 rim that needs a 225/35R19 tyre for the Octavia MK3.

 

X-TREM 7.5Jx19 ET51 alloy rim 5E0071499A JX2

https://www.skoda-parts.com/spare-part/5e0071499ajx2-aluminium-rim-19-x-trem-skoda-43496.html

 

Edited 7 January, 2023 by Carlston

[Ads230]

It is 7.5J, but @RoddersUK 235/35 tyres fit with absolutely zero issues and do provide better (even if just 3mm) sidewall protection from pesky hard things - albeit my Xtremes are already ruined due to standard 'whiteworm', gravel rash, and concrete parking space delineations 🙄

[ajm83]

I know 235 is the width but will fitting 235s change the speedo accuracy as an unintended side effect?  Mine's already pretty much bang on with GPS so I don't want it to under-read.

[Ads230]

There should be zero perceptible change, unsure if it'd be physically related 👍 - unless you buy a different profile (i.e., instead of 35, you get 45 or some other odd sizing).

Edited 9 January, 2023 by Ads230

[Ecomatt]

The ratio the speedo is out is 1% on the sites I have seen that compares tyre circumferences.

I have 235 Asy 5 fitted with zero issues. I might switch to the Asy 6 225 section tyres as the rubber is less dense at 88 rather than 91 load rating. The 235 are a heavier tyre than the 225 and as such will have more rotational mass. 

[Dooge]

235's also look soooo much better than the 225's which look stretched IMO.

 

Ive been running 235's for a few thousand miles with no adverse reactions. The tyres were cheaper and its a more standard size meaning if you need one in an emergency I would imagine its easier to get a replacement.

 

In terms of increases in comfort or grip its minimal and to answer your question, it barely gives any extra protection over a 225.

 

If you want to check speedo error try willtheyfit.com, looking at it it says there will be less than half a MPH decrease at 30mph due to a slightly bigger circumference (meaning you'll be going under the shown speed) on a 235 over a 225, its so marginal it wont make a difference.