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[frostbite]

Hey guys

I have found a nice set of 18s,  there fitted with 235-40-18 and have an et of 42, 

Question is what size spacer would be needed  and would the standard suspension be to high or would it settle down?

[Bojan]

how wide are the rims?

[McBandy]

It will sit like a 4x4 if it's not lowered, depends of that's the look you're after?

[Mr Gav]

The ET for standard wheels is ET33 though I think the Irmscher wheels were a little different, My Azev C`s are ET38 and are 8" wide, with 235/45/17 tyres and fit perfectly.

[pauls]

My irmscher wheels are 18s with et30 running on 235/40/18. 

[frostbite]

Well I was having another look at them and they are shagged,  look nice from a distance but you can't get away from a rattle can finish.

Another question

What's the largest rim size without lowering?

Cheers

[Doctor Gollum]

It will sit like a 4x4 if it's not lowered, depends of that's the look you're after?

Rubbish... rolling radius is almost identical to the 235/45/17s fitted to MV6/late Elites, and smaller than the 225/55/16s fitted to the bulk of the Omega catalogue.

[McBandy]

It will sit like a 4x4 if it's not lowered, depends of that's the look you're after?

Rubbish... rolling radius is almost identical to the 235/45/17s fitted to MV6/late Elites, and smaller than the 225/55/16s fitted to the bulk of the Omega catalogue.

With lower profile tyres and standard suspension it will appear higher...

[Doctor Gollum]

Nope, from personal experience.

[Nick W]

It will sit like a 4x4 if it's not lowered, depends of that's the look you're after?

Rubbish... rolling radius is almost identical to the 235/45/17s fitted to MV6/late Elites, and smaller than the 225/55/16s fitted to the bulk of the Omega catalogue.

With lower profile tyres and standard suspension it will appear higher...

Only if you've changed the rolling radius(the actual diameter of the tyre fitted to the wheel and inflated to the pressure you're going to use) by a large amount. And that will have more affect on the gearing than appearance. The quoted tyre size probably won't do that.


You can fiddle about with the appearance by doing all sorts of visual tricks like changing the colour of the wheels, polishing the rims, different offsets and widths, even using a tyre with a squarer shoulder(this applies more to older tyre sizes rather than modern low-profiles)

[McBandy]

Fine, I know when to not try and be helpful in future, I only worked for a tyre company for 3 years so have no idea what I'm talking about 

[minifreek]

I had 18's fitted to my Omega when I first go it, and TBH it looked bloody terrible with them fitted... was waaay too high, and looked like Id jacked the suspension up....

The rolling radius will be the same, but they will make the car appear to be higher....

Mine was fitted with 215 35 18 tyres, correct 18 inch profile for a Vectra B, so that might have played a part too

[McBandy]

I had 18's fitted to my Omega when I first go it, and TBH it looked bloody terrible with them fitted... was waaay too high, and looked like Id jacked the suspension up....

The rolling radius will be the same, but they will make the car appear to be higher....

Mine was fitted with 215 35 18 tyres, correct 18 inch profile for a Vectra B, so that might have played a part too

I believe it's due to having lower profile tyres on larger rims so less give in the tyres with the weight of the car, hence why it's easy to spot when people only change the wheels

[Lazydocker]

Fine, I know when to not try and be helpful in future, I only worked for a tyre company for 3 years so have no idea what I'm talking about 

Ok. Explain it then... How does a wheel/tyre combination change with the same rolling radius alter the suspension height

[Doctor Gollum]

A picture paints a thousand words...



Rolling radius identical to the original, factory wheels/tyres, standard working self levelling suspension...

And not a 4x4 in sight

Incidentally,  not my car