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[cem_devecioglu]

Third from bottom of the 2.5 list, but table is clearly from your imagination rather than your owners manual

 


thanks .. I'm not that quick to prepare a chart like that

[Rifai]

You can ignore that about the speedo

The exact wheel/tyre combo in the manual depends on spec. The manual in the link is the facelift one, but I have listed the prefacelift ones too.
If you run all those tyre sizes listed through the convertor on miata.net you will see whatthe minimal differences of the rolling radii are. Anything below 2% can be ignored as the speedo is only accurate to 10%.

Being a V6 Your car would have left the factory with 205/65/15 tyres fitted, so use that size as your bench mark in the conversion calculator

you are absolutely right. thank you so much!! I went back to car manual and yes it was 205/65/15 the 195/65/15 was the spare wheel size.

Now I guess I need  215/50/17 tires and it will be OK.

Thank you All for your help, much appreciated 

for your information , opel use 195 size on that year .. for GLS and CD


and also

That is correct my car's owner manual shows the same: 195/65/15 for GL and 205/65/15 for CD & MV6

On a 7.5J, 225 may be a shade narrow, 215 will start to look a bit shite. If tyre costs need you to go narrower, consider getting the right rims for that size.

UK insurance companies can be a bit touchy over tyre sizes not approved by the manufacturer, so you may need to declare non standard sizes (usually doesn't bump the premium too much, esp if its an optional extra size_

I know that but I am only stuck with 17" rims as I stated before I couldn't find the 16 neither the 15' wheels. according to tire size calculator 215/50/17 are the best size comparing to the factory ones. see below:



I agree 225 or 215 would be narrow but I don't want risk it as the differences are quite high:



and here is the 235



I don't want to buy aftermarket rims because I already suffered with my current ones, I want the original Opel rims.


one final question, do I need a spacer for the 17" rims with ET39?

[05omegav6]

To be clear, the factory 17" rims you intend to fit have have an offset of ET33.

They require a tyre of size 235/45/17, as fitted at the factory.

The rolling radius is irrelevant, as the differences between the various sizes are negligible.

To put that another way, if it were a significant problem, then the factory would have fitted the tyres you suggest. They didn't, therefore, neither should you

[05omegav6]

Worth noting also that with 5 revolutions less per mile than the correct 205/65/15 tyre, the 235/45/17 tyres will improve acceleration slightly. Which is nice... (but neglible to the point of irrelevance)

[cem_devecioglu]

Rifai, buy what you want

[Rifai]

To be clear, the factory 17" rims you intend to fit have have an offset of ET33.

They require a tyre of size 235/45/17, as fitted at the factory.

The rolling radius is irrelevant, as the differences between the various sizes are negligible.

To put that another way, if it were a significant problem, then the factory would have fitted the tyres you suggest. They didn't, therefore, neither should you

Got it. Thank you dude. much appreciated 

[Rifai]

I am now looking at the Ronal Steinmetz 16" rims.... are they worth the money?

they look so nice!

[05omegav6]

I am now looking at the Ronal Steinmetz 16" rims.... are they worth the money?

they look so nice!

If they need painting Cems your man...

[Rifai]

here they are


http://www.ebay.com/itm/Ronal-Steinmetz-16-Alloy-Wheels-7Jx16H2-ET39-Vauxhall-Corsa-5-Lug-110-PCD-/271509661737

[05omegav6]

Different  same size/ET as standard 16" rims, so would need 225/55/16 tyres

[Rifai]

Different  same size/ET as standard 16" rims, so would need 225/55/16 tyres

exactly! same as the manual 

I got really confused with what tires to use for 17" rims. it might seem stupid to some people here but I don't want to spend hundreds or Euros on Bridgestone or Continental new set of tires with wrong size

Thanks buddy

[TheBoy]

For *standard* Omega sizes (195/65/15, 205/65/15, 225/55/16 and 235/45/17), all but the 225/55/16 use the same configs for the instrument, FC etc.  The 225/55/16 needs a different config.

Post 1998 cars, the instrument panel is programmable, Pre 1998, it isn't - you have to replace it. Or accept its out.

All FCs are programmable.