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[Rifai]

Hello,

I have Opel Omega B 2.5 CD 1997 X25XE / 170hp

can any one please tell me the original wheel size that comes on it? I know it's 15" but I need to know the wheel width and ET.

the car came with 7j 18" ET45 aftermarket rings with spacer, I believe it's not the right the size for my car and it's affecting the car performance especially when taking off.

I know 7j 16" will fit OK on my car but I couldn't find that size in my country.

will a 17" 7.5j ET39 (the omega 2003 rims) fit on my car? will there be any issues especially with the wheel width 7.5j ?

I appreciate your advice on the matter and sharing your personal experience.

[05omegav6]

The rims from a 2003 Omega will be a perfect fit

[cem_devecioglu]

opel omega 97 original size is 195/65-15..   wheel pcd 5x110  et 35-45 bore 65.1


you can safely use any wheel that have 5x110 pcd..  16-17 sizes are ok for omega.. but you must keep tyre height ratio as small as possible if you want better acceleration.. I'm currently using 225/45-17 wheels 8J

[Rifai]

Thank you Taxi Al 

opel omega 97 original size is 195/65-15..   wheel pcd 5x110  et 35-45 bore 65.1


you can safely use any wheel that have 5x110 pcd..  16-17 sizes are ok for omega.. but you must keep tyre height ratio as small as possible if you want better acceleration.. I'm currently using 225/45-17 wheels 8J

I was worried about the rims width 75mm(7.5J) . I am planning on fitting 225/50/17 tyres, I am currently using 235/40/18

I assume you are using the same car as mine, do you have issues with car acceleration? I do with my 18" rims

[cem_devecioglu]

Thank you Taxi Al 

opel omega 97 original size is 195/65-15..   wheel pcd 5x110  et 35-45 bore 65.1


you can safely use any wheel that have 5x110 pcd..  16-17 sizes are ok for omega.. but you must keep tyre height ratio as small as possible if you want better acceleration.. I'm currently using 225/45-17 wheels 8J

I was worried about the rims width 75mm(7.5J) . I am planning on fitting 225/50/17 tyres, I am currently using 235/40/18

I assume you are using the same car as mine, do you have issues with car acceleration? I do with my 18" rims

if you use tire size calculators you will see your current tire is better for acceleration 235/40-18 >2026.96 mm circumference vs 225/50-17 >2063.4


imo 225/50-17 is too big

[05omegav6]

Standard Omega 17"s run 235/45/17 tyres regardless of what ANYONE else tries to tell you

[cem_devecioglu]

Standard Omega 17"s run 235/45/17 tyres regardless of what ANYONE else tries to tell you

 


you know what.. this info is publicly available in million sites   and also not the standard size for 97  


very helpful post

[05omegav6]

Cem the Ops car has non standard wheels on it.
He knows this and wishes to change them.
He can readily get a set of 17" wheels from a 2003 car.
These will have 235/45/17 tyres.

Those are the facts. 

[cem_devecioglu]

Cem the Ops car has non standard wheels on it.
He knows this and wishes to change them.
He can readily get a set of 17" wheels from a 2003 car.
These will have 235/45/17 tyres.

Those are the facts. 

first this car is not an 2003 car


second I already told the standard size
third your post is aiming at me and tell the op to ignore


these are the real facts!

if you want respect , first you behave like that!

and congrats to you , as you turned a simple help tread to a slanging match

[05omegav6]

Part of the question was whether the 17" wheels from a later car would fit.

The only answer to this question is yes. Even 2003 cars have a 15" steel spare as standard.

So to repeat, yes a 2003 factory wheel will fit perfectly, and it will require a 235/45/17 tyre.

[cem_devecioglu]

Part of the question was whether the 17" wheels from a later car would fit.

The only answer to this question is yes. Even 2003 cars have a 15" steel spare as standard.

So to repeat, yes a 2003 factory wheel will fit perfectly, and it will require a 235/45/17 tyre.

was it a part of question "whose answers I will ignore" ?

[05omegav6]

To answer another part of the Ops question...

Your 18" wheels ideally need a 12 or 15mm spacer, and should have either 235/40/18 or 245/40/18 tyres fitted.

This would then make them the equivalent offsett/tyre fitment to the factory approved Irmscher 18" wheels which had either an ET30 or ET33 for the Omega fitment

[cem_devecioglu]

To answer another part of the Ops question...

Your 18" wheels ideally need a 12 or 15mm spacer, and should have either 235/40/18 or 245/40/18 tyres fitted.

This would then make them the equivalent offsett/tyre fitment to the factory approved Irmscher 18" wheels which had either an ET30 or ET33 for the Omega fitment

you didnt answer my question

[Rifai]

OK guys I really don't want you arguing about it. I guess you both are right on different things.

225/50/17 yes are big for my car according to tire size calculator. but I will have to agree with Taxi Al on the 25/45/17 as they have almost the same diameter as the original one(195/65/15)... take a look on result from www.miata.net website:



and yes I am using spacer for my 18" rims but not sure if 12 or 15 mm.

my current rims are aftermarket made and one of them I doubt to be bent so the car is not stable when I go over 90km/ph.
whats more I am looking for more comfort ride in my new rims using higher tires(45 or 50) I am having a bad experience with the current ones especially when I go over a road bump. but what concerns me the most is the car acceleration, I tried a 2.0 omega and it's a way better than my 2.5 V6.

I would go for a 16" rims but I couldn't find any around here not even the 15".

And please no need to argue about it, as Cem said it's was just a simple help question.

Many thanks!

[05omegav6]

I wasn't arguing

Anyways, my Irmscher Stila 18" wheels have an offset of ET33, but Irmscher Sportstars have an offset of ET30.
Both are Omega fitments, so whichever spacer you can find more easily will be fine

Note, with some tyres you can get away with an offset of ET38 with 8J 18 wheels, but they can rub on the front struts, so aren't recommended...

You will find that 225/55/16 and 245/40/18 are the same rolling radius. 235/45/17 and 235/40/18 are almost the same rolling radius...

Incidentally details of the official factory tyre sizes for the facelift can be found on pages 227 and 228 of the Owners manual, here...

http://www.omegaowners.com/forum/index.php?topic=90477.0

The official 18" tyre sizes come from Irmschers certificate of conformity supplied with the wheels when new

Factory wheel/tyre sizes depend on engine size and spec, but all Omega Bs from '94-'03 have 195/65/15 spare wheels as standard.

Facelift cars had the following...

Four cylinder, including diesel...
195/65/15
205/65/15
225/55/16
235/45/17

All V6s...
205/65/15
225/55/16
235/45/17

Pre facelift cars had the following...

All four cylinder...
195/65/15
205/65/15
225/55/16

All v6...
205/65/15
225/55/16
235/45/17 MV6 only, '97-'99.

Hopefully that answers your wheel/tyre questions