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[rikki_essex]

Good morning all i have a slow puncture on the nsf and ive taken it to the garage twice and they cant find it leaking anywhere is it ok to use the spare for a while and keep the alloy in the boot as the spare. Obviously you can use it but is it ok to do a long trip on it as its a different Tyre size. I was thinking about getting them swapped about to see if its the rim or tyre as the tyre looks good to me and the garage

[Andy B]

Good morning all i have a slow puncture on the nsf and ive taken it to the garage twice and they cant find it leaking anywhere is it ok to use the spare for a while and keep the alloy in the boot as the spare. Obviously you can use it but is it ok to do a long trip on it as its a different Tyre size. I was thinking about getting them swapped about to see if its the rim or tyre as the tyre looks good to me and the garage

Course you can use the wheel. The tyre is a different size because the rim is a different size Just don't sit in the outside lane at silly mph.

Don't you have somewhere else you can take your alloy to? It doesn't say too much about your garage if they can't sort a simply slow puncture on two attempts 

[rikki_essex]

Well the place ive taken it to seems to think it might be coming through the paint i must admit id never heard that one before but both times they have put a sealant on the inside of the rim after testing it in the tank and the couldnt see no bubbles.

[Andy B]

Well the place ive taken it to seems to think it might be coming through the paint i must admit id never heard that one before but both times they have put a sealant on the inside of the rim after testing it in the tank and the couldnt see no bubbles.

Porous alloys aren't of the question but ....... I'd still be inclined to think an iffy seal on the bead 

[tigers_gonads]

Pull the tyre off.
Clean the surface were the tyre sits with some fine sand paper.
Give the surface a wipe down with some thinners then spray it with clear lacquer.
Give it a couple of days in a warm place to harden up then refit the tyre 

It sounds like the lacquer may have gone porous with age 
Also change the valve or maybe apply a little grease to the end, just in case it is sticking and leaking past the rubber seal 

[rikki_essex]

sound like a plan its a good job the wifes dad is a sprayer and his garage is all set up to do such jobs.

[rikki_essex]

thanks Andy ill take it some where else first and see what they can do.

[Elite Pete]

I think there's a sticker on the spare saying not to go over 80kmh

[Andy B]

I think there's a sticker on the spare saying not to go over 80kmh

Is there? Can't say as I've seen one ..... but never looked for one though. Neither the rim nor the tyre are actually 'space savers' ie a slim tyre on an orange rim 

[Entwood]

I think there's a sticker on the spare saying not to go over 80kmh

Is there? Can't say as I've seen one ..... but never looked for one though. Neither the rim nor the tyre are actually 'space savers' ie a slim tyre on an orange rim 

Still on mine ... which looks like its never been on the road !! And the steel spare for a 235/45 IS a space saver

Also in the handbook p181

Omega with tyre size 225/55 R 16

The spare wheel is fitted with a smaller tyre on
a steel rim. If you use the spare wheel the
vehicle's handling may be altered. Obtain a
replacement for the faulty tyre as soon as
possible, and have the wheel balanced and
fitted to the vehicle.

Omega with tyre size 235/45 R 17

The spare wheel is fitted with a smaller tyre on
a steel wheel. It may only be used as a
temporary spare wheel.

Notes on the temporary spare wheel

Fit only one temporary spare wheel.

Do not drive faster than 50 mph (80 km/h).

Take bends slowly.

Do not use the temporary spare wheel for a
lengthy period.

Replace temporary spare wheel with
repaired wheel without delay.

Do not use tyre chains. If you need to use
tyre chains after suffering a flat rear tyre, fit
the temporary spare wheel on the front axle
and transfer one of the front wheels to the
rear axle. Adjust tyre inflation pressure.

HTH

[rikki_essex]

thanks very much for that so ill swap it for the spare and i take it off and sand it and repaint probably be about a week so should be ok

[Andy B]

.....

Still on mine ... which looks like its never been on the road !! And the steel spare for a 235/45 IS a space saver
 ....

but you know what I mean ......   

[TheBoy]

As most Omega spares are classed as space savers, its a "get me home" only.

Most seem to be 195/65/15 91H - which makes the speed rating and the load index below GM spec.  That and the width difference, I'd be inclined to use as little as possible.

[albitz]

Got my spare on at the moment.It was doing considerably more than 80 km/h this morning.Oops.

[Vamps]

I must be driving different Omegas as 3 out of 4, not looked at this one, have had full size spare wheels, 2 estates and one saloon, only difference is they were steel and not alloy....

As to OP's problem, I had this on a motorbike, porous alloys, I put in some aerosol tyre sealer and seemed to do the job, certainly for 3 years.... Front tyre....