Hello guys, as a title says I would like to fit new set of wheels on my estate octy, more specifically 225/40/R18 on 8J rim in front and 245/40/R18 on 9J rim in rear. Is it gonna fit or it will be wider than actual car? Has any body done it?

 

Edit: I forgot to mention that ET is 30

Edited 22 April, 20206 yr by Marosh

https://www.willtheyfit.com/

Is there a reason you want to put wider wheels and tyres on the rear?

 

It would greatly benefit a rwd car, but I cant see the benefit a fwd car would get on the road.

Stance, yo!

@tunedude No, it's just a set of wheels that I could have for a good price, unfortunately it's a set that has 8J at the front and 9J at the rear.  I really like design of that wheels so I'm just curious if I can fit them to my car.

As the original Skoda wheels are ET51 and 18 x 7.5J, those will be fine with an ET of 30.

 

But...245/40/18 is too big, it'll look like a tractor! Rears will need to be 245/30/18 or 235/35/18 to match the front circumference.

Edited 22 April, 20206 yr by pist0nbr0ke

If you go for it post up pics so we can see how it looks.

For the techies, how would this affect the abs/TC/tpms?

 

Edit: the different tyre size front to back I mean.

Edited 23 April, 20206 yr by MarkyG82

@MarkyG82 I changed my mind after little bit of calculation, so I ended up ordering Xtreme's.

2 hours ago, MarkyG82 said:

If you go for it post up pics so we can see how it looks.

For the techies, how would this affect the abs/TC/tpms?

 

Edit: the different tyre size front to back I mean.

 

I'm not a techie, but as long as you reset the TPMS after fitting it wouldn't affect it. Same goes for using a space saver spare wheel, for example.

 

There would be no effect on ABS or TC as far as I can see.

@pist0nbr0ke are space savers not the same (or similar) outside diameter to stock wheels? The 245/40 is much taller than the standard 225/40. But it depends if the abs and related systems work on front/rear difference or just across the individual axle.

1 hour ago, MarkyG82 said:

@pist0nbr0ke are space savers not the same (or similar) outside diameter to stock wheels? The 245/40 is much taller than the standard 225/40. But it depends if the abs and related systems work on front/rear difference or just across the individual axle.

ABS based TPMS system don't just use rotational speed, they do more in-depth analysis of the signals from the ABS sensors that will detect if a space saver is fitted even if the rotational speed is identical.

 

Sounds implausible, but from personal experience from when I had to fit my space saver when I was getting an alloy repaired (after the supplying dealer simply painted the wheel, paint which came off the first time I washed the car).

1 hour ago, MarkyG82 said:

@pist0nbr0ke are space savers not the same (or similar) outside diameter to stock wheels? The 245/40 is much taller than the standard 225/40. But it depends if the abs and related systems work on front/rear difference or just across the individual axle.

 

42 minutes ago, PetrolDave said:

ABS based TPMS system don't just use rotational speed, they do more in-depth analysis of the signals from the ABS sensors that will detect if a space saver is fitted even if the rotational speed is identical.

 

Sounds implausible, but from personal experience from when I had to fit my space saver when I was getting an alloy repaired (after the supplying dealer simply painted the wheel, paint which came off the first time I washed the car).

 

As @PetrolDave says, I have put a 225/40/18 wheel and tyre on a car with 235/40/19's on the other 3 (in an emergency), reset the TPMS and had no issue.

 

When the TPMS is reset, it doesn't 'freeze' the existing values there and then, it starts a 'relearning' process which tells the system a new set of values, which are calculated after travelling a certain distance. It will then monitor the continuous rotation speed of the wheel using the ABS sensors and warn if this rotation speed changes outside given parameters, e.g. when a tyre deflates.

 

This is at least true for TPMS systems without sensors on the wheel itself (indirect, I believe it's called). Direct systems will simply monitor individual tyre pressures.