Omega Owners Forum

Omega Help Area => Omega General Help => Topic started by: JunboJames on 19 February 2014, 13:12:29

Title: Widest wheel, lowest offset
Post by: JunboJames on 19 February 2014, 13:12:29
Bit of a random one, but, whats the widest wheel and lowest offset you can run on the front and rear?
Because when I get an Omega I want to put 18x9.5 et12 wheels on it, but I'm going to need adapters to change the PCD from 5x110 to 5x114.3, I also want to put 16x10 et-10 wheels on the rear.

So what I'm asking is, are both of them width-offsets combo's possible?

Thanks, James
Title: Re: Widest wheel, lowest offset
Post by: TheBoy on 19 February 2014, 13:37:39
To avoid catching the wheelarch under compression and rubbing the inside of the tyre on the strut, you're generally looking at all 235 tyres or 245 tyres that do not have rim protection on the inner edge, and 8J, around ET30 - ET32.

Rear has more scope due to more space inboard
Title: Re: Widest wheel, lowest offset
Post by: JunboJames on 19 February 2014, 14:46:34
To avoid catching the wheelarch under compression and rubbing the inside of the tyre on the strut, you're generally looking at all 235 tyres or 245 tyres that do not have rim protection on the inner edge, and 8J, around ET30 - ET32.

Rear has more scope due to more space inboard

So will a 9.5j et12 wheel fit with a 20-30mm spacer/PCD adapter? I'm going to roll/flare the arches too.

On the front I plan on using 205/40R18's, and on the rear I plan on using 225/35R18's
Title: Re: Widest wheel, lowest offset
Post by: 05omegav6 on 19 February 2014, 15:21:00
Those tyres are stupidly narrow for the rim widths you're thinking of :-\
Title: Re: Widest wheel, lowest offset
Post by: JunboJames on 19 February 2014, 15:59:35
Those tyres are stupidly narrow for the rim widths you're thinking of :-\
I know, but that's how I want them to be haha
Title: Re: Widest wheel, lowest offset
Post by: 05omegav6 on 19 February 2014, 16:02:07
You'll also be running into camber issues at the rear, and however it might look, that will be horrific to drive ::)
Title: Re: Widest wheel, lowest offset
Post by: Entwood on 19 February 2014, 16:04:56
Excuse my stupidity... but what is the point of fitting wide rims and narrow tyres ??? seems to defeat the object to me .. :(
Title: Re: Widest wheel, lowest offset
Post by: Kevin Wood on 19 February 2014, 16:09:15
205 tyres will be dangerous on a 9.5j rim, simple as that - quite apart from anything else (spacers, PCD adaptors, etc. ugh!). That'll be way outside the tyre manufacturer's recommendation, so if anything goes wrong and you end up before the beak an expert witness will have you for breakfast.
Title: Re: Widest wheel, lowest offset
Post by: JunboJames on 19 February 2014, 16:16:24
I really don't know why I bothered asking. All I want to know is if it will fit or not, but you lot seem to care more about camber, tyre width and if something goes wrong with the wheel/tyre set I want to use.
Title: Re: Widest wheel, lowest offset
Post by: GastronomicKleptomaniac on 19 February 2014, 16:33:25
I really don't know why I bothered asking. All I want to know is if it will fit or not, but you lot seem to care more about camber, tyre width and if something goes wrong with the wheel/tyre set I want to use.

...they're trying to help guide you away from making a spectacular cockup. Omegas are hugely sensitive to suspension setup, and if you're 19 and debating whether to get one, burning through £400-500 worth of tyres every three weeks, because you're running them way off spec, isn't a good way to spend your time.
Title: Re: Widest wheel, lowest offset
Post by: JunboJames on 19 February 2014, 16:47:16
If that's what I want to do, then that's my choice. Let me find out the hard way. I was simply after a "Yeah, they'll fit" or a "No, the offset is too low"

I get that it's a big wheel with a fairly small tyre on it, but thats the look I want and if it handles like crap, then I'll have to either sort it some how, or just live with it handling weird.
Title: Re: Widest wheel, lowest offset
Post by: Entwood on 19 February 2014, 16:47:46
The most important parts of a car are the 4 very small patches of rubber that keep you both on the road and travelling in the direction you require, as well as ensuring you actually stop when you require to.

You seem to wish to compromise those 4 patches of rubber for some, as yet, unknown reason.

There is a high possibility that, unless you intend to only drive in the sub-sahara deserts, that you will be driving the car somewhere close to other members of the human race. Your compromise not only risks your life, but puts all other road users at risk as well.

I, for one, will not assist in such reckless behavior, as quite simply put, it could be my family you put at risk, something I will not allow.

Melodramatic ?? perhaps, but that's how I see it.

If I saw a vehicle with such a combination I would have no qualms about reporting to both police and insurance - as they both would probably take a serious view of the roadworthiness of such a combination.
Title: Re: Widest wheel, lowest offset
Post by: JunboJames on 19 February 2014, 16:51:35
So because I want to do something outside of the norm, you think the car will instantly kill everyone and everything within a 10 mile radius?... Nice.
Title: Re: Widest wheel, lowest offset
Post by: 05omegav6 on 19 February 2014, 16:59:09
So because I want to do something outside of the norm, you think the car will instantly kill everyone and everything within a 10 mile radius?... Nice.

Set up poorly with standard wheels/tyres/suspension the Omega becomes uncontrollable at best, start messing with components and Entwoods point is bang on the money.

And from bitter experience, destroying the tyres every week or so will really start to piss you off.

But hey, what do we know... ::)
Title: Re: Widest wheel, lowest offset
Post by: GastronomicKleptomaniac on 19 February 2014, 17:00:17
If that's what I want to do, then that's my choice. Let me find out the hard way. I was simply after a "Yeah, they'll fit" or a "No, the offset is too low"

I get that it's a big wheel with a fairly small tyre on it, but thats the look I want and if it handles like crap, then I'll have to either sort it some how, or just live with it handling weird.

If you want your tyres like that, you need a VW forum. Don't come onto a forum where people have experience, and throw it back at them.

Presumably you've not driven an Omega, or anything fairly hefty and RWD. With your lack of driving experience especially, even a sloppy standard car would be "interesting" in the wet - never mind something you've buggered about with in the name of style. Ill say it again, Omegas are HUGELY sensitive to the setup of the chassis, including even what brand/ type of tyres you put on.

On your intro topic you're bemoaning the fact that the insurance is expensive - that doesn't tally with wanting to go all out and put stretched tyres on, and damned be the financial penalty should they end up scrubbing to pieces within a short time.
Title: Re: Widest wheel, lowest offset
Post by: JunboJames on 19 February 2014, 17:15:33
Just forget I asked!
None of you seem to want to actually help. I was simple asking if the wheels I want to fit, would fit. But all of you only want to tell me how they're a sensitive chassis, have camber issues, and how it'll be horrible to drive.
Title: Re: Widest wheel, lowest offset
Post by: Entwood on 19 February 2014, 17:26:37
Just forget I asked!
None of you seem to want to actually help. I was simple asking if the wheels I want to fit, would fit. But all of you only want to tell me how they're a sensitive chassis, have camber issues, and how it'll be horrible to drive.

We are helping ... we're trying to stop you making a large mistake that could, potentially, cost you, or someone else, their life.... if you don't think that is helpful advice ... then there is little hope you'll actually listen to anything ... however .. I'll try .. the answer is .. "no they won't fit" ...  happy now ???
Title: Re: Widest wheel, lowest offset
Post by: JunboJames on 19 February 2014, 18:01:37
Entwood, I understand why you're saying what you're saying, but I don't see how it's helpful on this thread. I would've rather had you say yes or no in the first place, rather than wasting alot of time going on about how the chassis is sensitive to the suspension set-up, how the are camber issues on the rear and everything else that was said for no real reason
Title: Re: Widest wheel, lowest offset
Post by: Entwood on 19 February 2014, 18:06:53
Entwood, I understand why you're saying what you're saying, but I don't see how it's helpful on this thread. I would've rather had you say yes or no in the first place, rather than wasting alot of time going on about how the chassis is sensitive to the suspension set-up, how the are camber issues on the rear and everything else that was said for no real reason

If trying to save a life is "no real reason" then there is little hope for you my friend ...  :(
Title: Re: Widest wheel, lowest offset
Post by: Shackeng on 19 February 2014, 18:39:35
Oh to be young and stupid again :-X :-X :-X Well I'm halfway there ::) ::) ::)
Title: Re: Widest wheel, lowest offset
Post by: tigers_gonads on 19 February 2014, 18:52:52
Trying to help this bloke is like playing chess with a pigeon. No matter how good you are at chess, the pigeon is just going to knock over the pieces, crap on the board and strut around like it's victorious
Title: Re: Widest wheel, lowest offset
Post by: chrisgixer on 19 February 2014, 19:00:52
Bit of a random one, but, whats the widest wheel and lowest offset you can run on the front and rear?
Because when I get an Omega I want to put 18x9.5 et12 wheels on it, but I'm going to need adapters to change the PCD from 5x110 to 5x114.3, I also want to put 16x10 et-10 wheels on the rear.

So what I'm asking is, are both of them width-offsets combo's possible?

Thanks, James

No!
Title: Re: Widest wheel, lowest offset
Post by: TheBoy on 19 February 2014, 19:48:36
The tyre won't fit the rim, at least 5cm too narrow, so won't seal, even before you get any lateral forces on it. Any responsible tyre fitter will refuse to fit such a tyre, and any that agrees to fit needs to be reported. As others have said, it would be dangerous, and you need to understand this.

I have no problem with people wanting to be individual, but no style is worth a life.

Thats before we consider that you want to use spacers. I have less of an issue with spacers from a safety viewpoint, but they are not ideal.

But to answer your question, ignoring the stupidity of what you are trying to achieve, no, those wheels will not fit by a country mile without fouling either the strut of the wheelarch, no matter what spacers you use.
Title: Re: Widest wheel, lowest offset
Post by: GastronomicKleptomaniac on 19 February 2014, 19:53:27
Trying to help this bloke is like playing chess with a pigeon. No matter how good you are at chess, the pigeon is just going to knock over the pieces, crap on the board and strut around like it's victorious

I wish we had a "rofl" emoticon.
Title: Re: Widest wheel, lowest offset
Post by: beefyecosse on 19 February 2014, 22:36:32
URL=http://s415.photobucket.com/user/beefyecosse/media/Facebook/Instagram%20Photos/1003937_10201324202604089_1322184653_n.jpg.html](http://i415.photobucket.com/albums/pp231/beefyecosse/Facebook/Instagram%20Photos/1003937_10201324202604089_1322184653_n.jpg)[/URL]  these are my 10 inch wide azev A's ET 18  fitted with 245/40/17 fitted to the rear of my omega i also have 8.5 wide on the front with an ET 13 offset.
Title: Re: Widest wheel, lowest offset
Post by: hotel21 on 19 February 2014, 22:37:16
Bottom line is, it will probably fit.

Probably will work quite fine forever and a day.

Probably handle absolutely fantoosh when cruisin in straight ones on your high street or suitable straight line raceway.

Probably handle like a bag of shite on anything resembling a corner and spit you off into your aunt fannys cottage or bus queue.

Cool as fek on the YouTube vids, mag photoshits or bar bragging rights though.

And, when it all goes the shape of the pear, your QC will be rubbing their cash cards together awaiting the result of your appeal.

Your call.  8)
Title: Re: Widest wheel, lowest offset
Post by: dbug on 19 February 2014, 23:31:25
URL=http://s415.photobucket.com/user/beefyecosse/media/Facebook/Instagram%20Photos/1003937_10201324202604089_1322184653_n.jpg.html](http://i415.photobucket.com/albums/pp231/beefyecosse/Facebook/Instagram%20Photos/1003937_10201324202604089_1322184653_n.jpg)[/URL]  these are my 10 inch wide azev A's ET 18  fitted with 245/40/17 fitted to the rear of my omega i also have 8.5 wide on the front with an ET 13 offset.

Those rear tyres look too narrow for the rim width ;)

To help the op making an expensive fool of himself this link gives table of tyre widths for given rim widths - http://www.brick-yard.co.uk/forum/tyre-size-for-rim-width_topic60146.html (http://www.brick-yard.co.uk/forum/tyre-size-for-rim-width_topic60146.html)  HTH ::)
Title: Re: Widest wheel, lowest offset
Post by: 05omegav6 on 19 February 2014, 23:34:38
URL=http://s415.photobucket.com/user/beefyecosse/media/Facebook/Instagram%20Photos/1003937_10201324202604089_1322184653_n.jpg.html](http://i415.photobucket.com/albums/pp231/beefyecosse/Facebook/Instagram%20Photos/1003937_10201324202604089_1322184653_n.jpg)[/URL]  these are my 10 inch wide azev A's ET 18  fitted with 245/40/17 fitted to the rear of my omega i also have 8.5 wide on the front with an ET 13 offset.
Htf does that pass an MoT with 17" tyres on 18" wheels :o
Title: Re: Widest wheel, lowest offset
Post by: omega3000 on 19 February 2014, 23:39:57
 :o

(https://encrypted-tbn3.gstatic.com/images?q=tbn:ANd9GcSY8mDdhK8YdFpLH1BwszynlmdPJ67vLXnqh_ZIygrpuZFCF9LFkA)
Title: Re: Widest wheel, lowest offset
Post by: chrisgixer on 19 February 2014, 23:42:38
That's about the only way to wedge a 9.5j on the front of an omega ;D
Title: Re: Widest wheel, lowest offset
Post by: GastronomicKleptomaniac on 20 February 2014, 10:19:25
:o

(https://encrypted-tbn3.gstatic.com/images?q=tbn:ANd9GcSY8mDdhK8YdFpLH1BwszynlmdPJ67vLXnqh_ZIygrpuZFCF9LFkA)

I don't understand why it's fashionable to look like you've lent your car to me, and I've gone and pulled a gaggle of fat lasses...
Title: Re: Widest wheel, lowest offset
Post by: Kevin Wood on 20 February 2014, 10:29:14
:o

(https://encrypted-tbn3.gstatic.com/images?q=tbn:ANd9GcSY8mDdhK8YdFpLH1BwszynlmdPJ67vLXnqh_ZIygrpuZFCF9LFkA)

Two words come to mind:


end - noun :

1.
the last part or extremity, lengthwise, of anything that is longer than it is wide or broad: the end of a street; the end of a rope....

bell - noun :

hollow metal object, typically in the shape of a deep inverted cup widening at the lip, that sounds a clear musical note when struck, especially by means of a clapper inside....

..and not necessarily in that order. ::)
Title: Re: Widest wheel, lowest offset
Post by: bootie on 20 February 2014, 13:21:40
URL=http://s415.photobucket.com/user/beefyecosse/media/Facebook/Instagram%20Photos/1003937_10201324202604089_1322184653_n.jpg.html](http://i415.photobucket.com/albums/pp231/beefyecosse/Facebook/Instagram%20Photos/1003937_10201324202604089_1322184653_n.jpg)[/URL]  these are my 10 inch wide azev A's ET 18  fitted with 245/40/17 fitted to the rear of my omega i also have 8.5 wide on the front with an ET 13 offset.
Htf does that pass an MoT with 17" tyres on 18" wheels :o
I think he meant an ET of 18 for that 17" wheel......... ;)
Title: Re: Widest wheel, lowest offset
Post by: biggriffin on 20 February 2014, 13:29:20
Urm. Hat baseball angle jaunty. ;D
Title: Re: Widest wheel, lowest offset
Post by: I_want_an_Omega on 20 February 2014, 13:31:31
Surely if you fit any wheel/tyre combo not specifically mentioned by the manufacturer and listed in the user manual, have you not broken the terms of the vehicle homologation and effectively invalidated your insurance?

As Omega's were only fitted with 15/16/17" wheels, would that not include 18" wheels as well? 
Title: Re: Widest wheel, lowest offset
Post by: biggriffin on 20 February 2014, 13:34:59
18" were a irmercher option.
Title: Re: Widest wheel, lowest offset
Post by: chrisgixer on 20 February 2014, 14:30:12
Surely if you fit any wheel/tyre combo not specifically mentioned by the manufacturer and listed in the user manual, have you not broken the terms of the vehicle homologation and effectively invalidated your insurance?

As Omega's were only fitted with 15/16/17" wheels, would that not include 18" wheels as well? 

Yep, hence insurer informed with tuv certificate from irmscher. Same goes for body kit. Adds a slight premium too. ::)
Title: Re: Widest wheel, lowest offset
Post by: 05omegav6 on 20 February 2014, 14:42:45
Misread that about the ET, but the tyres definitely don't look happy on it :-\
Title: Re: Widest wheel, lowest offset
Post by: TheBoy on 20 February 2014, 14:47:06
Surely if you fit any wheel/tyre combo not specifically mentioned by the manufacturer and listed in the user manual, have you not broken the terms of the vehicle homologation and effectively invalidated your insurance?

As Omega's were only fitted with 15/16/17" wheels, would that not include 18" wheels as well? 

Yep, hence insurer informed with tuv certificate from irmscher. Same goes for body kit. Adds a slight premium too. ::)
Indeed, and if you hadn't declared this mods - factory option or otherwise - your insurance would be invalid.  The extra premium is the price those wanting such mods pay.  The mods on my car, including LPG and Irmscher stuff looks to have added around £30 a year, so not too bad.

Last time I was involved in a prang, there were bits of lots of cars and barrier scattered across the dual carriageway, and the old bill sweeping what they could, and requested our insurances got recovery trucks out ASAP. I must have spent 20mins at the start of the call to mine answering questions where you could tell the insurance were looking for a way out...
Title: Re: Widest wheel, lowest offset
Post by: beefyecosse on 20 February 2014, 22:31:49
Misread that about the ET, but the tyres definitely don't look happy on it :-\
(http://[URL=http://s415.photobucket.com/user/beefyecosse/media/Facebook/PVS%202013/474813_10200240096422112_1978589303_o.jpg.html][IMG]http://i415.photobucket.com/albums/pp231/beefyecosse/Facebook/PVS%202013/474813_10200240096422112_1978589303_o.jpg)[/URL][/img]the same wheels fitted with205/40/17 on the front and 215/40/17 tyres on the rear on my edition 100 astra coupe last year at PVS.
Title: Re: Widest wheel, lowest offset
Post by: 05omegav6 on 20 February 2014, 22:32:58
Misread that about the ET, but the tyres definitely don't look happy on it :-\
(http://[URL=http://s415.photobucket.com/user/beefyecosse/media/Facebook/PVS%202013/474813_10200240096422112_1978589303_o.jpg.html][IMG]http://i415.photobucket.com/albums/pp231/beefyecosse/Facebook/PVS%202013/474813_10200240096422112_1978589303_o.jpg)[/URL][/img]the same wheels fitted with205/40/17 on the front and 215/40/17 tyres on the rear on my edition 100 astra coupe last year at PVS.
What size diameter are the wheels?
Title: Re: Widest wheel, lowest offset
Post by: beefyecosse on 20 February 2014, 22:38:42
(http://i415.photobucket.com/albums/pp231/beefyecosse/Facebook/PVS%202013/474813_10200240096422112_1978589303_o.jpg)][URL=http://s415.photobucket.com/user/beefyecosse/media/Facebook/PVS%202013/474813_10200240096422112_1978589303_o.jpg.html](http://i415.photobucket.com/albums/pp231/beefyecosse/Facebook/PVS%202013/474813_10200240096422112_1978589303_o.jpg) (http://[URL=http://s415.photobucket.com/user/beefyecosse/media/Facebook/PVS%202013/474813_10200240096422112_1978589303_o.jpg.html)[/url]
Title: Re: Widest wheel, lowest offset
Post by: 05omegav6 on 20 February 2014, 22:40:01
(http://[URL=http://s415.photobucket.com/user/beefyecosse/media/Facebook/PVS%202013/474813_10200240096422112_1978589303_o.jpg.html][IMG]http://i415.photobucket.com/albums/pp231/beefyecosse/Facebook/PVS%202013/474813_10200240096422112_1978589303_o.jpg)[/URL][/img]
Are the wheels 17" or 18"?
Title: Re: Widest wheel, lowest offset
Post by: beefyecosse on 20 February 2014, 22:43:25
8.5 inch x 17 inch front ET 13  10inch x 17 inch rear ET 18 
Title: Re: Widest wheel, lowest offset
Post by: 05omegav6 on 20 February 2014, 22:45:58
 :y got it... that's cleared up what I misread yesterday :y
Title: Re: Widest wheel, lowest offset
Post by: dbug on 21 February 2014, 00:03:55
Misread that about the ET, but the tyres definitely don't look happy on it :-\
the same wheels fitted with205/40/17 on the front and 215/40/17 tyres on the rear on my edition 100 astra coupe last year at PVS.

Yep tyres definitely too narrow for rims ;)