Hi all

Looking at replacing my 225/40/19 tyres on my TDI VRS

Anyone running a different size but still 19 inch ???

Thanks Andy

I understand that some put 235/35s on them. I’d be concerned about ride quality it’s not as if there isn’t plenty of grip with quality performance tyres in the standard sizes

3 hours ago, whippersnapper said:

I understand that some put 235/35s on them. I’d be concerned about ride quality it’s not as if there isn’t plenty of grip with quality performance tyres in the standard sizes

The outside diameter of 235/35R19 is too small for the Octavia MK4, as shown in the chart below.

235/35R19 has an outside radius 7.75mm less than 225/40R19, so that's how much bigger the gap will be between the top of the tyre and the wheelarch. This will result in an Octavia MK4 with sports/lowered suspension starting to look like it has standard ride height...or at least not as lowered as it looked on the standard 225/40R19 tyre size.

Perhaps look at 235/40R19, although the minimum rim width that ETRTO list for this tyre size is 8". However, ETRTO also list the same 8" minimum rim width for the wider and lower sidewall height 245/35R19...so some would consider the fitment of a 235/40R19 to a 7.5" rim width as not much different to fitting a 245/35R19 to an 8" rim width.

Outside diameter of tyre

225/40R19 662.6mm

235/35R19 647.1mm (2.3% smaller outside diameter compared to 225/40R19)

Edited 11 April, 20251 yr by Carlston

For clarity I’m not recommending doing it. It makes sense to me just to sunrise the OEM sizes.

Agree with @Carlston

You're maybe thinking of the common Mk3/3.5 move from 225/40R18 to 235/35R19 - in which case, yes, a drop in profile is needed. In order to drop down to a 35 profile, you'd want to be moving to a 255 or even 265 section. Similarly, to go up to a 45 profile, you'd be wanting a 200 tyre - it's quite a big difference!

235 is the maximum tyre that can fit on a 7.5J rim. It is recommended to have a 215/225.

You don't want to be doing maximums or minimums for anything tyre related. On a 7.5J, a 205 will be stretched which will cause issues. 235 on a 7.5J is approaching instability territory IMO - the sidewall of the tyre is having to do more work. For a 235/245 section tyre, you're better off with an 8.5" wheel IMO. Some cars (Karoq, etc) have 19x8" wheels, but AFAIK the Octavia is a 19x7.5".

Lot's of people put 235s on a 7.5J wheel - be it on a Cupra, GTI, R, S3 or whatever, but that doesn't mean it's right. There's a reason VW ships the cars with 225. You won't notice the difference going from 225 to 235. Go from 225 on a 7.5J to 245 on an 8.5J and yes, there'll be a change - and not always a good one.

TLDR - absolutely increase tyre width if you want better grip, but you'll need to increase the wheel width to suit. @OP I would stick with 225/40R19. You aren't going to get anything that offers any benefit - stick some nice PS5s on it instead.