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[CyNick]

I've found sites on the net to compare tyre sizes, but nothing to compare wheels sizes..

Issue : 3.0 MV6 1999 - been in storage for a while, needs MOT to go back on the road.

I have 2 sets of wheels but none with legal tread. I could fit new tyres, but I have been looking at eBay and can buy wheels with legal tyres for less than budget tyres..

I was hoping to take the cheap option i.e. cheap wheels from eBay, MOT and then run car for 1 month to make sure there are no serious faults with the car.. Then properly refurbish & re-boot the original wheels..

2 questions and some advice please..

1 : What are the correct wheel specifications (PCD, Offset, bore etc)??

2 : Can you get away with any other sizes?


Any specific advice regarding vehicles that have not been on the road for 2 years (garaged, but not a warm and cosy one) would be greatly appreciated..

Thanks Nick

[PhilCavSRi130]

Plenty of fresh petrol and an oil change first off Nick. Both deteriorate over time especially petrol. Worth checking your brakes too before you take it out for a run as they may have siezed up from lack of use.
Other than that if its been garaged then should be ok.

[CyNick]

Plenty of fresh petrol and an oil change first off Nick. Both deteriorate over time especially petrol. Worth checking your brakes too before you take it out for a run as they may have siezed up from lack of use.
Other than that if its been garaged then should be ok.

Thanks for that Phil, the oil was changed not long ago when I had a front crank oil seal changed, but I'd forgotten about the Petrol..

Tank is almost empty so maybe I'll add some and run that out, and then fill her?? 

Or should I drain the tank first??

[cem_devecioglu]

pcd  5x110 , if you mean other pcd sizes like 5x112 they will cause headache..

[CyNick]

pcd  5x110 , if you mean other pcd sizes like 5x112 they will cause headache..

Thanks for that cem..

I've found out a bit more and it seems the bore needs to be 65.1mm

But I'm not sure about the ET offset figures..

And does it make a difference if the wheels come off a front wheel drive vehicle like a Vectra?

The originals on mine are 235/45 17's and the spare set of wheels are 205/65 15's

I see some Omegas have spares at '195' what are the thoughts on running a 3.0 V6 with this thin a tyre? Promise to drive carefully if they fit!! :exclamation

[cem_devecioglu]

pcd  5x110 , if you mean other pcd sizes like 5x112 they will cause headache..

Thanks for that cem..

I've found out a bit more and it seems the bore needs to be 65.1mm

But I'm not sure about the ET offset figures..

And does it make a difference if the wheels come off a front wheel drive vehicle like a Vectra?

The originals on mine are 235/45 17's and the spare set of wheels are 205/65 15's

I see some Omegas have spares at '195' what are the thoughts on running a 3.0 V6 with this thin a tyre? Promise to drive carefully if they fit!! :exclamation

no problems with 195x65x15 , I use this size for winter tyres (at least 4 years)..

and I think the vectra ones will fit ..

[PhilCavSRi130]

Should be ok with the petrol as long as you put a couple of gallon of fresh in it or fill it up at the nearest petrol station. It loses its octane rating over time so in effect goes stale.

[ChevetteNick]

And does it make a difference if the wheels come off a front wheel drive vehicle like a Vectra?

I posted the Omegas wheel specs the other day maybe the mods could make it a sticky:
5 x 110mm P.C.D
65.1mm bore
35 - 45 Offset (E.T)
The Omega has a "front wheel drive" offset anyway

[2woody]

the Omega does not have a "front wheel drive" offset.

As far as I know, Vauxhall are the only cars to have 110mm pcd. And the V-car (except Monza / Senator A) are the only wheels that fit directly.

Vectra wheels require 13mm spacers and 13m longer wheel bolts to be acceptable.

regarding tyres, there are two important dimensions to be aware of :-

first, there's the "hub height" or more properly, the "static laden radius". This is how far from the road surface the centre of the wheel sits. The suspension geometry is designed around this height.

second, there's the "wheel revs per mile", this is the effective "gearing" of the tyre. It s actually the figure that the car manufacturer designs the drivetrain around.

Both of these figures are available from the tyre manufacturers, usually on the web. YOU CANNOT CALCULATE them from the nominal size of the tyre.

so, in answer to your question - within reason, any tyre with the same hub height and same wrpm is acceptable.

from a design point of view, make sure the above two things are correct and then choose if you want grip or handling. For grip, go wide and low-profile, for handling, go narrower and higher-profile.

Over the years, I've found 195s to be the best handling, whilst the 235s give the best grip, but not so good handling

hope this helps.

[ChevetteNick]

the Omega does not have a "front wheel drive" offset.

Any wheel that has a high positive offset is known as a "Front Wheel Drive" offset which just happens to be the range that covers the Omegas.

[gstylebaby]

A mate of mine ran his omega on veccy sri wheels and had no problem. I'm running 18 inch on mine and have run 17 inch but the originals were 15 inch. Some of the saabs have the same p.d.c as the vauxhall.

[CyNick]

Thanks Guys, In different times I would just buy good quality rubber for the standard 235/45/17's as I hate having second quality 

Why risk buying wheels that might not fit properly!


But now I  look at eBay and wonder.. would those fit?? 



Quick pole : Vehicle been in garage for two years, What do you do? :

a : Buy good tyres and not worry 'cos you know that any problem that occurs on a mig can be fixed

b : Be tight, buy cheap wheels with legal tread till you're sure there's no major problem??

[cem_devecioglu]

Thanks Guys, In different times I would just buy good quality rubber for the standard 235/45/17's as I hate having second quality 

Why risk buying wheels that might not fit properly!


But now I  look at eBay and wonder.. would those fit?? 



Quick pole : Vehicle been in garage for two years, What do you do? :

a : Buy good tyres and not worry 'cos you know that any problem that occurs on a mig can be fixed

b : Be tight, buy cheap wheels with legal tread till you're sure there's no major problem??

personally I wont go for the cheapo tires as they are the only connection between you and the life when your are  on a wet road..and anyway you can use them for another car..