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[Anthony in Madrid]

Hi guys...
I'll be in the market for a wheel and tyre upgrade from 15" to 17" Soon.
I'll be lowering my omega 30 mm so if anyone can help me....
I dont want the wheels to be wider than the arch so what numbers am I looking at?
I mean the rim width?
Do I need to consider a spacer or do anything with the nuts?
Also..Will the wheels of a 2001 Omega fit my Mig 1994 2.5 V6???
Cheers in advance.
Ant

[TheBoy]

235/45/17 is standard tyre size, pcd is 110, would have to check the offset for 7.5j

30mm at back is too much. 20mm tops

[Temetsy]

I'd sat it fits with fat tires as well as lo-pro tires. I have lowered mig with 16" alloys and semi slim tires and there is a LOT room between tires and archs. All omegas have 5x110 and 61,5 (IIRC) center hole.

[TheBoy]

All Omegas are identical.

[05omegav6]

To save looking, offset is ET33

If you're looking to 18"s, then 8J, ET33 with either 235/40/18 or 245/40/18 tyres

Some nice five spoke 17s on the Design Edition

[TheBoy]

To save looking, offset is ET33

If you're looking to 18"s, then 8J, ET33 with either 235/40/18 or 245/40/18 tyres

Some nice five spoke 17s on the Design Edition

ET32 ish on 8J wheels. 7.5j will be something like 37...

[05omegav6]

To save looking, offset is ET33

If you're looking to 18"s, then 8J, ET33 with either 235/40/18 or 245/40/18 tyres

Some nice five spoke 17s on the Design Edition

ET32 ish on 8J wheels. 7.5j will be something like 37...

7J16 is ET39

7.5J17 and 8J18 are both ET33

9J18 is ET30

Based on what I have here

[elvin315]

I posted this on the CateraOwners Forum (http://cateraowners.forumotion.com) but you might find some useful info for your Omega regarding wheels & tires, offsets, hud diameter, etc. I made it a few years ago and it might be missing some newer Vauxhall/Opel models but it should point you in the right direction.

The first custom touch many Catera owners make are bigger and wider wheels. Some of you do it to improve handling and give your cars a sportier stance. Others want that custom look only chrome Dubs (20" wheels) can provide. Depending on the width and offset big wheels will fit an unlowered Catera. No guarantees on Dub Deuces (22" wheels) or lowered cars.

Remember, the wider the tire, the lower the aspect ratio. That means a shorter sidewall. To support the weight of the car and keep the rim from contacting the road surface tire makers have to stiffen the sidewalls. That results in a harsh ride. The shorter the sidewall, the rougher the ride. If improved handling is your aim the best compromise between side grip and ride quality would be 17" - 18" wheels. Bigger than that and normal street imperfections will be more noticeable.

Whatever sized wheel you choose, if you want them to fit they must have a 5x110 bolt pattern, a hub diameter of 65.1mm, and, depending on the wheel, a +35mm to +45mm offset. Offset determines the wheel's inner and outer clearances. Follow the link to an explanation of offset and how to measure it. Or you can use the Offset Calculator.

http://www.yokohamatire.com/utcustom.asp
https://www.rsracing.com/tech-wheel.html
http://www.1010tires.com/WheelOffsetCalculator.asp

The Catera shares the same wheels sizes with the following GM cars. Wheels that fit them will fit the Catera. The Opel/Vauxhall wheels will be nearly impossible to find in the US but the rest should be available. Search eBay, the auto recyclers, and the local Pennysavers. I am by no means an expert so please double check the wheels before purchasing. Some cars like the Saturn Ion and Chevy Cobalt use both 4 and 5 bolt patterns depending on trim level. Please report any mistakes, corrections, or additions to this list and I will update it.

Make/Model Model Years Pattern Offset/mm Hub/mm OPEL/VAUXHALL Astra 5 Stud 1998 - 2003 5x110 35 - 45 65.1 Astra Coupe after 1998 5x110 35 - 45 65.1 Corsa 1.7 CDTi after 2003 5x110 45 65.1 Omega after 1994 5x110 35 - 38 65.1 Vectra/Sigrum after 2002 5x110 35 - 38 65.1 Zafira after 1998 5x110 35 - 45 65.1 SAAB 9-3 2002 - on 5x110 37 - 38 65.1 900/9-3 1992 - 2002 5x110 37 - 49 65.1 9-5 1998 - on 5x110 40 65.1 SATURN Aura 2007 - on 5x110 35 - 45 65.1 Astra 2008 - on 5x110 35 - 45 65.1 Ion Redline * 2004 - 2007 5x110 35 - 45 65.1 L Series 2000 - 2005 5x110 35 - 45 65.1 Sky 2007 - on 5x110 55 65.1 CHEVROLET Cobalt ** 2007 - on 5x110 35 - 45 65.1 HHR 2005 - on 5x110 35 - 45 65.1 Malibu 2004 - on 5x110 35 - 45 65.1 PONTIAC G5 *** 2005 - on 5x110 35 - 45 65.1 G6 2005 - on 5x110 35 - 45 65.1 Solstice 2006 - on 5x110 ?? 65.1

* - Redline only
** - all models except the LS and LT1         
*** - GT only

Elvin

[05omegav6]

The Pontiac G6 has a bolt pattern of 5x120

[elvin315]

From the TireRack site:

Pontiac G6
Offset: 40mm
Backspacing: 5.79"
Bolt Pattern: 5-110
Rec. Tire Size:225/50-17

[05omegav6]

Not my day today

Got confuddled with the G8

[chrisgixer]

Not my day today

Got confuddled with the G8

Does Al need a new Anorak?

[Anthony in Madrid]

235/45/17 is standard tyre size, pcd is 110, would have to check the offset for 7.5j

30mm at back is too much. 20mm tops

Hi thanks for the reply...
Appreciate it....
When you say check "offset" for 7.5...
What does that mean exactly?
Sorry for the lack of knowledge 
Cheers
Ant

[05omegav6]

Question answered in replies #4 and #6

[elvin315]

The offset is the distance from the mounting surface (where the wheel meets the brake disc hat) and the center line of the wheel, usually measured in mm.