Right, I'm thinking of doing the above things are in play but has anyone done it yet or am I going to encounter problems, pcd, center bore and even offset is almost the same (current 44) bentlys 41

So current setup

235x40x19 8j width with spacers 12mm front and rear15mm with longer bolts to match

 

Proposed setup

245x40x19 9xwidth

 

 

 

Is it going to be tight etc? 🤔 

Edited 16 July, 20232 yr by Dahmich
Added info

My 245/40/19 tyres would scrape, on full compression at the rear when I had 15mm spacers.

Specifically on the inside where the rear bumper fixes to the rear qtr panel.

 

 

I now have 10mm spacers at the rear.

 

This is on the factory 19x8 ET44 rims.

 

Not sure how u'll go with 9" wide rims and 245 wide tyres.

Edited 17 July, 20232 yr by JR RS

As JR RS had rubbing with 245/40R19 fitted to 8Jx19 ET29 (15mm spacers effectively change an ET44 offset to ET29) but not 245/40R19 fitted to 8Jx19 ET34 (10mm spacers effectively change an ET44 offset to ET34), you should be ok with 245/40R19 fitted to 9Jx19 ET41.

 

Notice in the below "Actual width of inflated tyres" chart, that the outside width of the 245/40R19 (measured at the widest point) is about 12mm wider (ie. 6mm each side) when fitting it to a 9J rim compared to fitting it to an 8J rim.

 

On the outside, the 245/40R19 fitted to a 9Jx19 ET41 rim will be in about the same place as a 245/40R19 fitted to an 8Jx19 ET35 rim.

 

On the inside, the 245/40R19 fitted to a 9Jx19 ET41 rim will be in about the same place as a 245/40R19 fitted to an 8Jx19 ET47 rim. So unless there's less than 6.5mm of clearance with the standard 235/40R19 fitted to a 8Jx19 ET44 rim, the 245/40R19 fitted to a 9Jx19 ET41 won't rub on the inside.

 

However, Bentley normally fits a much wider 275/40R19 to this 9Jx19 ET41 rim. The sidewalls of a 245/40R19 fitted to this rim will be quite stretched, which not only makes the ride noticeably harder compared to fitting the same size tyre to an 8J rim, but the sidewalls won't bulge out much if at all, resulting in the alloy rim being very vulnerable to kerb damage.

 

You might find that the Bentley rim is a lot heavier than the normal Superb MK3 rims, because the Bentley is likely to be a much heavier car and therefore need stronger rims. However, standard 19" rims on the Superb MK3 are no lightweight. Perhaps around 14.6kg each for the 8Jx19 ET44 rims, depending on exact model.

 

Actual width of inflated tyres (measured outside of sidewall to outside of sidewall, ie. at widest point)

235/40R19 fitted to 8J = 235mm

245/40R19 fitted to 8J = 242mm

245/40R19 fitted to 9J = 254mm

 

Edited 17 July, 20232 yr by Carlston

On 16/07/2023 at 18:55, Dahmich said:

Right, I'm thinking of doing the above things are in play but has anyone done it yet or am I going to encounter problems, pcd, center bore and even offset is almost the same (current 44) bentlys 41

So current setup

235x40x19 8j width with spacers 12mm front and rear15mm with longer bolts to match

Proposed setup

245x40x19 9xwidth

 

If you're looking for some impressive wheels for the Superb MK3, perhaps consider 245/35R20 fitted to 8Jx20 ET41 5/112 57.1 alloy rims from the Kodiaq.

 

245/35R20 has almost the same outside diameter as the 245/40R19. As you can see in the chart below, there's less than 1mm difference in the outside diameter.

 

As you can see in the ETRTO chart below, both the 245/40R19 and 245/35R20 can be fitted to an 8J rim width.

 

Outside diameter of tyres

245/40R19 678.6mm

245/35R20 679.5mm

 

ETRTO approved rim widths
245/40R19 8.0-8.5-9.5

255/40R19 8.5-9.0-10.0
245/35R20 8.0-8.5-9.5

255/35R20 8.5-9.0-10.0

 

8Jx20 ET20 5/112 57.1 Kodiaq alloy rims

https://eshop.skoda-auto.cz/alu-kola/c/alloyWheels?sort=priceAsc&q=%3AscoreDesc%3AcarType%3AKodiaq%2B%282016%2B%29%3ArimDiameter%3A20%22#

 

Continental SportContact 7 245/35R20 95Y XL (Euro label C A 72dB)

https://www.blackcircles.com/catalogue/continental/sport-contact-7/245/35/R20/Y/95/m?tyre=43308084

 

Edited 18 July, 20232 yr by Carlston