It seems that a square setup would be easier to source and doesn't look too bad on the fitment.

BMW 18" Sizes
7.5J x 18 ET45 - 225/40/18
8.0J x 18 ET52 - 245/35/18

Likely 19" Sizes
8.5J ET40 - 245/30/19
8.5J ET40 - 245/30/19

https://www.willtheyfit.com/index.p...th=7.5&offset=45&width2=245&aspect2=30&wheel_size=19&wheel_width=8-5&offset2=40

https://www.willtheyfit.com/index.p...idth=8&offset=52&width2=245&aspect2=30&wheel_size=19&wheel_width=8-5&offset2=40

I could go slightly wider on the rear tyre

8.5J ET40 - 255/30/19

https://www.willtheyfit.com/index.p...idth=8&offset=52&width2=255&aspect2=30&wheel_size=19&wheel_width=8-5&offset2=40

 

You have to be very careful with 'will they fit', they only show the clearance/dimensions for the alloy wheel, not the tyre.

The diagram does show an illustration of the tyre though, as a rough guideline. If the image shows the tyre sticking out much further than previously get a bit nervous.

I'd want ET45 for a 255mm rear personally.

 

You have to be very careful with 'will they fit', they only show the clearance/dimensions for the alloy wheel, not the tyre.

The diagram does show an illustration of the tyre though, as a rough guideline. If the image shows the tyre sticking out much further than previously get a bit nervous.

I'd want ET45 for a 255mm rear personally.

Thanks for the reply.

The larger offset pulls the wheel into the arch rather than push it out (as I understand), so is the concern it might scrub on the arch itself?

I guess the next question then is, will this be worth trying to do? I'm thinking of wider rears for more rubber on the ground,is it enough to be worth it? The car is stage 2 and the gearbox stage 3, I was thinking about better traction.

There's also some value to a square setup as all 4 wheels/tyres are the same, they can be rotated. Does the square setup I mentioned fit?

 

Your square set-up fits. Yes, the concern is the rear outer arch.

255 or 265mm rears sound like a good plan for big torque, fitting on roughly ET45 or ET50 rims respectively.

 

Your square set-up fits. Yes, the concern is the rear outer arch.

255 or 265mm rears sound like a good plan for big torque, fitting on roughly ET45 or ET50 rims respectively.

For those last 2 measurements, are we still on an 8.5J?

 

255 will go on a 8.5", but you'll need a 9"J wheel to take a 265mm tyre. Something like a BBS CI-R (ET4:

 

Awesome, really appreciate the help!

VMR don't do the wheel I'm looking at in 9.0J so I might have to go with the 8.5J ET45 - 255/30/19 for the rear. I'm thinking about the

https://www.vmrwheels.eu/eu/v801/14/vmr-wheels-v801?number=VMRV801.3&c=16

from VMR.

Would you recommend VMR? I don't want cheap wheels, I want them to be reliable and safe. Other recommendations welcome.

 

V801's have roll forged barrels so nice and tough, a sensible choice.

 

Nice car.
I've seen it driving round town, sound really good. Especially as it whizzed past the New Inn! FYI, I live just around the corner from yourself!

What exhaust system do you have fitted?

 

Nice car.
I've seen it driving round town, sound really good. Especially as it whizzed past the New Inn! FYI, I live just around the corner from yourself!

What exhaust system do you have fitted?

Hey, thanks!

That's a good road past that pub, steep downhill so you can just leave it in 2nd and let it burble on the way down 🤣

It's a BCS turbo-back system with a 100CPI sports cat, DDE and the M Performance Exhaust.

 

V801's have roll forged barrels so nice and tough, a sensible choice.

Cheers, I really appreciate the input, it's helped a lot. Will be ordering some new wheels soon 😎

 

So VMR got back to me:

"We do not produce 8.5x19 ET45 with 5x120 PCD, this offset is only for 5x112. We have:
8.5x19 ET43 and 9.5x19 ET50 staggered
8.5x19 ET43 squared"

I do like the sound of the staggered setup for more rubber at the back as I mentioned earlier, but I'm concerned about the fitment.

Here's the WillItFit[1] link, which has some pretty big increases! "Compared to your existing wheel, this new wheel will have an inner rim which is 17.1mm closer to the suspension strut. The outer rim will poke out 21.1mm more than before."

Is that too much of an increase? The car is on the adaptive suspension and stock components, not lowered or anything.

[1]

https://www.willtheyfit.com/index.p...idth=8&offset=52&width2=265&aspect2=30&wheel_size=19&wheel_width=9-5&offset2=50

 

I'd go 8.5" square wheels, with 245/30/19 fronts and 255/30/19 rears.

 

Sounds reasonable, thanks again!

 

My local tyre shop is advising 245/35 and 255/30, something about rolling radius? Any advice?

 

No, they're wrong, ass clowns. That would look like a penny farthing, the fronts would be almost 20mm bigger on diameter.

With the recommended set-up, the fronts would only be about 5mm smaller. Not noticeable, and the correct radius for the car.

 

What about 235/35 front and 255/30 rear they're asking?

 

I have 801s with the staggeted setup VMR mention. Could only fit 225 on the 8.5" front as the tyre was extremely close to the strut. Tyres I have are 4S's. 255 fits easily on the rear 9.5"

 

What about 235/35 front and 255/30 rear they're asking?

Why are they asking you? Aren't they the tyre experts? :?

225/35/19 and 255/30/19 are a perfect diameter match, but a bit stretched (zero rim protection).
235/35/19 are about 12mm bigger than 255/30's.
245/30/19 are about 5mm smaller than 255/30's.

I have 801s with the staggeted setup VMR mention. Could only fit 225 on the 8.5" front as the tyre was extremely close to the strut. Tyres I have are 4S's. 255 fits easily on the rear 9.5"

It's not unusual to need a 3mm spacer to fit wider tyres to 8.5" ET45 wheels.

 

I wasn't looking to go into spacers. Would the 225/35 make sense in that case?

 

If you're not melting your current 225 fronts, never parallel park, don't suffer understeer, and don't mind the stretched look, 225/35 will be absolutely fine.

Personally I can't tick any of those boxes!

 

225/35 look fine 👍

 

I have 801s with the staggeted setup VMR mention. Could only fit 225 on the 8.5" front as the tyre was extremely close to the strut. Tyres I have are 4S's. 255 fits easily on the rear 9.5"

Did the 9.5" go in the rear arch ok? Got any pics?

 

If you're not melting your current 225 fronts, never parallel park, don't suffer understeer, and don't mind the stretched look, 225/35 will be absolutely fine.

Personally I can't tick any of those boxes!

Oversteer is usually the problem! Parking and things I'm less worried about, always careful there.

I might just have to try and fit the 245/30 and see if they will work without the spacers.

 

I run 245mm tyres at ET40 and they're fine. I would expect ET43 to just be ok, but you might need a very thin spacer - worst case.