If you increase the width of wheels, is it a good idea to decrease the offset to keep the current scrub radius, or leave the same offset to preserve the ratio between what scrubs and what doesnt. I know thats not an accurate way of saying it but you get the idea. Thanks in advance.

Mark

Excesive scrub radius should be avoided but usually trying to get rid of it causes more hassle than its worth.

If you increase the width of the wheel, but maintain the same offset, surely, the scrub angle remains the same?

quote:

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Originally posted by Mark Allanson
If you increase the width of the wheel, but maintain the same offset, surely, the scrub angle remains the same?

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I'm gonna drag this up again because it's really bugging me .

Say the wheel has a zero offset for simplicity and you're replacing it with a 2" wider wheel. The offset stays the same but there's an extra inch of wheel each side - essentially meaning you have an extra inch of scrub radius. Is this what you want or should you try and preserve the scrub radius you had before by changing the offset?

Mark

no no no!

you answered your own question!

There is an extra inch of wheel EACH SIDE!

the inch on the inside equals the inch on the outside so the centre of the contact patch stays in exactly the same place.......................unless, as Stu16v pointed out, you change the wheel/tyre diameter, which is not somehting I'd ever thought of Stu!!! I've learnt something there!

[Edited on 11/9/05 by NS Dev]

Aha! I was under the impression that the measurement for scrub radius was taken from the inside of the wheel rather than the centre.

Mark

Best measured as the horizontal distance from the centre of the tyre/wheel contact point to the king pin axis at the height of the stub axle/wheel axis.