dugong
Posted a lot
One Of Us Will Live To Rue The Day We Met Each Other (Wire : 2008)
Posts: 3,292
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Because I really don't get it.
Why's offset important? If you get a wheel with the right PCD but the wrong offset, can you correct it? Is a 0 offset the best place to start with an aftermarket wheel if you don't know your offset?
What's this backspacing the Yanks are on about? (place on ebay seemed quite keen in knowing lest I make the wrong choice wheel fit wise).
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I tried explaining this to my girlfriend, then promptly gave up Essentially if you get the wrong offset wheels they will be either to far in or sticking right out of the arches. try this. www.raceandroad.com/offset.asp |
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Ether
Posted a lot
Posts: 4,450
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As those guys say ^^
But, basically - you'll either foul the arch or a suspension/steering component, like track rod ends, if you have an offset that's completely wrong. You can bring wheels that foul suspension/steering components out with spacers but, if you need serious spacing, you should buy hub-centric spacers (they're an exact fit for the hub as opposed to universal Halfords jobbies and reduce wobble at speed). Also, make sure you compensate with longer lug bolts. And there's still a good chance that they'll foul the arch.
Don't let that put you off, though. Try before you buy.
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May 20, 2007 10:31:32 GMT
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Quickly and simply;
Offset = The position of the mounting face inside the rim, exactly in the centre of the rim is 0 offset, towards the hub/mounting point is negative (-) offset. Towards the road side is positive offset (+)
Backspacing = The measurement between the mounting face and the inside edge of the rim.
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Skyline: 1963 - 1973 - 1983
Sunny: 1982
450SLC: 1973
Navara: 1992
Gloria: 1992
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Seth
South East
MorrisOxford TriumphMirald HillmanMinx BorgwardIsabellaCombi
Posts: 15,542
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May 20, 2007 12:30:10 GMT
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As no-one has specifically mentioned it and soem may not bother to look at Rmads link this is why it is important:
"Inset or outset
This is very important. Ignore this and you can end up with all manner of nasty problems. This determines how the suspension and self-centring steering behave. The most obvious problem that will occur if you get it wrong is that the steering will either become so heavy that you can't turn the car, or so light that you need to spend all your time keeping the curse word in a straight line."
The wheel's offset is a designed element of the cars' suspension and steering its not such a figure plucked from the sky when the car designers fancied thowing on some bitchin' wheels. If you fit wheels with the wrong offset it changes the position of the centre of the tyre relative to the steering pivot axis and will screw up your handling/steering.
Spacers could be used to correct things if your wheels have too much inset. As the car bible says you can get away with a few mm difference from factory dinmensions. In fact I know that the various Triumph Herald/Spitfire factory wheels had slightly different offsets on the same supension.
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Follow your dreams or you might as well be a vegetable. |
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