Taff107

Excuse my ignorance but how could I check the size of my offsets? Is it as simple as just measuring them? The problem is that my 19" OZ superlegs are rubbing the hell out of the rear wheelarches.
I've been advised that the offsets I need are 50 but I haven't got a clue what they are at the moment. Where could I get some 50's and what price would I be looking at?
Thanks for any help.

richiewong

Have a look on the back of the wheel, you'll usually find the wheel size and ET value there.

Taff107

Okay,if I get the size from there, where can I get some offsets?

Adam M

the ET value IS the offset!

Taff107

Right, I'm lost here....
How do I alter the ET Value / offset on my wheel?

ski

Only by buying new rims or using spacers.

greasemonkey

The offset (or the ET value) is the distance between the centre of the wheel and its mounting face.

What side of the arches are the wheels rubbing on, the inside or the outside?

If they're rubbing on the inside, you can get spacers to move them out a bit (i.e. increase the offset).

If the tyre's rubbing on the outside of the arch, you need to decrease the offset, and the only way of doing that is to machine the mounting face of the wheel, or modify the brake tophat, hub or suspension. None of these is really a practical option, so in practice only way to sort it would be to fit narrower tyres (maybe wheels as well) or wheels with the correct offset value.

Taff107

They're rubbing on the inside of the arch. Would it be possible to strengthen the rear suspension, i.e. uprated springs etc? I know people have 19" Ozs on their car and have no real problem with it.
Here's a pic - dunno if it helps any....

greasemonkey

Where, exactly? Via the inside wall of the tyre, or the treaded portion?

Of course, but if you don't do the front as well, you'll cause a handling imbalance. At end of day fecking around with your suspension just to make your wheels fit is very much putting the cart before the horse. You should have bought wheels and tyres that fitted in the first place.

That might be because they've chosen the right wheels with the right size tyres on them.

It's not the diameter of the wheel itself that causes rubbing, it's using too large a diameter and/or width of tyre (i.e. bad choice of width and/or aspect ratio), or locating the wheel off centre in the arch (i.e. wrong wheel offset).

No, tells us f**k all sorry. Apart from the fact that your car's black, has Morrettes, and your wheels are silver OZ Superleggeras, none of which actually enables us to help you.

We can't offer you any pointed assistance without knowing what width (7.5JJ or 8JJ?), what offset your wheels are (and OZ's will have this stamped, engraved or cast somewhere you can see it), and we further need to know what width and aspect ratio of tyre you have fitted.

As stated above, if the inside walls of your tyres are tagging the arches, you may be able to get away with using thin spacers. If it's rubbing further over onto the treaded portion, the tyre diameter is also likely to be bigger than it should be.

Taff107

Thanks for the bollocking.....I mean... help!!
Right, I'll find out all the details tommorrow and get back to you