Hi everybody, looking to change the wheels on my mk4 and was thinking a set of mk3 Gemini alloys might look good?

Or has anybody changed there wheels for ideas?

18”s look far too small on the Mk4 imo.  

6 minutes ago, SC03OTT said:

18”s look far too small on the Mk4 imo.  

Thanks but looking to keep 18s on the car think it will look like a jeep with 19s as I can't lower it with the warranty 

mk3 alloys have different specs than mk4. They will be positioned more toward shocks.

9 minutes ago, TheUltraRunner said:

mk3 alloys have different specs than mk4. They will be positioned more toward shocks.

Thanks for that I didn't realise might not work so

4 hours ago, Aaronh86 said:

Thanks for that I didn't realise might not work so

 

The 18" rims on the Octavia MK4 have a 7.5Jx18 ET48 specification.

 

If you use 18" rims from the Octavia MK3, the centre of the tyre will be moved 3mm into the wheelarch.

 

Compared to 10mm wheel spacers, which would move the centre of the tyre 10mm further out of the wheelarch, 3mm is quite a small difference.

 

Are you thinking of using 225/45R18 tyres from the Octavia MK4, or 225/40R18 tyres from the Octavia MK3?

 

3mm difference in offset is ok and perfectly usable, but not keeping to the standard offset which might be slightly better. It's possible that you wouldn't notice any difference when driving the car.

 

225/40R18 instead of the correct 225/45R18 is not ok, because the outside diameter of the tyre is about 3.4% too small. 

 

Octavia MK3 Gemini 7.5x18 ET51 5/112 57.1 alloy rims

https://eshop.skoda-auto.cz/cs_CZ/hlinikove-disky/c/alloyWheels?q=%3ApriceAsc%3AcarType%3AOctavia%2BIII%2B%282012-2017%29%3AcarType%3AOctavia%2BIII%2B%282017%2B%29&page=2

 

If you're going to use 225/45R18 tyres, maybe look at the 7Jx18 ET45 alloy rims from the Karoq or 7Jx18 ET43 alloy rims from the Kodiaq.

 

ET45 will move the centre of the tyre 3mm further out in the wheelarch compared to ET48.

 

ET43 will move the centre of the tyre 5mm further out in the wheel arch compared to ET48.

 

225/45R18 tyres only need 7J rims, so using 7J instead of 7.5J will give extra protection from kerbing damage and give a slightly more comfortable ride.

 

You can see lots of Karoq and Kodiaq alloy rims on "skoda eshop cz"

https://eshop.skoda-auto.cz/

 

Edited 7 February, 20233 yr by Carlston

6 hours ago, Carlston said:

 

The 18" rims on the Octavia MK4 have a 7.5Jx18 ET48 specification.

 

If you use 18" rims from the Octavia MK3, the centre of the tyre will be moved 3mm into the wheelarch.

 

Compared to 10mm wheel spacers, which would move the centre of the tyre 10mm further out of the wheelarch, 3mm is quite a small difference.

 

Are you thinking of using 225/45R18 tyres from the Octavia MK4, or 225/40R18 tyres from the Octavia MK3?

 

3mm difference in offset is ok and perfectly usable, but not keeping to the standard offset which might be slightly better. It's possible that you wouldn't notice any difference when driving the car.

 

225/40R18 instead of the correct 225/45R18 is not ok, because the outside diameter of the tyre is about 3.4% too small. 

 

Octavia MK3 Gemini 7.5x18 ET51 5/112 57.1 alloy rims

https://eshop.skoda-auto.cz/cs_CZ/hlinikove-disky/c/alloyWheels?q=%3ApriceAsc%3AcarType%3AOctavia%2BIII%2B%282012-2017%29%3AcarType%3AOctavia%2BIII%2B%282017%2B%29&page=2

 

If you're going to use 225/45R18 tyres, maybe look at the 7Jx18 ET45 alloy rims from the Karoq or 7Jx18 ET43 alloy rims from the Kodiaq.

 

ET45 will move the centre of the tyre 3mm further out in the wheelarch compared to ET48.

 

ET43 will move the centre of the tyre 5mm further out in the wheel arch compared to ET48.

 

225/45R18 tyres only need 7J rims, so using 7J instead of 7.5J will give extra protection from kerbing damage and give a slightly more comfortable ride.

 

You can see lots of Karoq and Kodiaq alloy rims on "skoda eshop cz"

https://eshop.skoda-auto.cz/

 

Thank you now I have 15mm and 20mm spacers I had on my sportline superb so I could use them.

The tyres on the mk3 alloys are already 225/40/r18 didn't really want to change these will 3.4% make that huge of a difference?

 

This should help, Skoda brochure with pictures of the all wheels, and their tyre sizes and the ET offset.

 

Octavia mk3 is listed as Octavia III, mk 4 as IV (Skoda use Roman numerals)

 

https://www.skoda.co.uk/_doc/639a0118-4da5-446b-a786-86e1f789b57b
 

 

 

 

2 hours ago, Aaronh86 said:

Thank you now I have 15mm and 20mm spacers I had on my sportline superb so I could use them.

The tyres on the mk3 alloys are already 225/40R18 didn't really want to change these will 3.4% make that huge of a difference?

 

With 225/40R18 tyres on the Octavia Mk4, the speedo might show 70mph when the actual speed is only about 65mph, ie. the speedo will over-read by a lot. You can check using the GPS speedo readout that google maps now includes in the app.

 

As you are considering using 15mm front and 20mm rear spacers, that puts you in the serious modification category. So extreme is relative, and 225/40R18 tyres instead of the correct 225/45R18 tyre size isn't really any more extreme than 15mm and 20mm spacers.

 

One advantage of 225/40R18 tyres over 225/45R18 is that they are a cheaper size.

 

Another option, is fitting slightly oversize 235/45R18 to those 7.5Jx18 ET51 Octavia MK3 rims. The 235/45R18 tyre size is one of the standard tyre sizes on the Superb MK3. 235/45R18 aren't thin rubber bands, but they should give the rims good protection from pothole damage and give a good ride on those 7.5J rims.

 

Edited 7 February, 20233 yr by Carlston

I have the spacers I had them on the sportline didn't really want to put them on the octavia.

Would 10mm spacers and 225/45/18 be a better option? 

I have the Geminis at home but would it be the same for the cadiz golf r alloys?

1 hour ago, Aaronh86 said:

I have the spacers I had them on the sportline didn't really want to put them on the octavia.

Would 10mm spacers and 225/45/18 be a better option? 

I have the Geminis at home but would it be the same for the cadiz golf r alloys?

 

I've seen the Cadiz alloy rims in both 7.5Jx18 ET49 and 8Jx19 ET50 specifications.

 

7.5Jx18 ET49 is almost the same specification as the standard Octavia MK4 7.5Jx18 ET48 specification.

 

There's no need for 10mm spacers with that offset.

 

Pushing the edge of the rims out by 10mm each side, just makes it easier to kerb the rims when going through 2 metre (6ft 6in) width restrictions.

 

VW Golf MK7 "CADIZ" alloy rims

1	5G0601025AG	Aluminium rim	'CADIZ' 7,5JX18H2 ET49 5/112	4	PR-C2K
	5G0601025AGFZZ	Aluminium gloss/black
1	5G0601025DQ	Aluminium rim	'CADIZ' 7,5JX18H2 ET49 5/112	4	PR-C2K

 

1	5G0601025AH	Aluminium rim	'CADIZ' 8 JX19H2 ET50 5/112	4	PR-C2T
	5G0601025AHFZZ	Aluminium gloss/black

54 minutes ago, Carlston said:

 

I've seen the Cadiz alloy rims in both 7.5Jx18 ET49 and 8Jx19 ET50 specifications.

 

7.5Jx18 ET49 is almost the same specification as the standard Octavia MK4 7.5Jx18 ET48 specification.

 

There's no need for 10mm spacers with that offset.

 

Pushing the edge of the rims out by 10mm each side, just makes it easier to kerb the rims when going through 2 metre (6ft 6in) width restrictions.

 

VW Golf MK7 "CADIZ" alloy rims

1	5G0601025AG	Aluminium rim	'CADIZ' 7,5JX18H2 ET49 5/112	4	PR-C2K
	5G0601025AGFZZ	Aluminium gloss/black
1	5G0601025DQ	Aluminium rim	'CADIZ' 7,5JX18H2 ET49 5/112	4	PR-C2K

 

1	5G0601025AH	Aluminium rim	'CADIZ' 8 JX19H2 ET50 5/112	4	PR-C2T
	5G0601025AHFZZ	Aluminium gloss/black

Thanks I can get a swap for 18" Cadiz alloys but would they look good on a mk4 octavia? I haven't seen many mk4s with different alloys other than standard

8 minutes ago, Aaronh86 said:

Thanks I can get a swap for 18" Cadiz alloys but would they look good on a mk4 octavia? I haven't seen many mk4s with different alloys other than standard

 

I prefer the industrial look.

 

So to update this thread I got a full set of oem skoda vega style alloys of super skoda or kopacek as it's called now with 225/45/r18 tyres