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26 Oct 2003, 21:17 (Ref:763898)
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#1 | |
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Racer
Join Date: Mar 2002
Posts: 248
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where a wheel mounts
where a wheel mounts onto as hub is half the width of the wheel right?
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26 Oct 2003, 21:33 (Ref:763906)
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#2 | ||
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Veteran
Join Date: Nov 2002
Posts: 693
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Not nessecarily. Some wheels have either a positive or negative offset.
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__________________
When asked facetiously if he knew he’d ruined a good story line by beating Patrick, Wheldon responded bluntly, “Don’t care one bit.”
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27 Oct 2003, 02:37 (Ref:764059)
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#3 | |||
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Veteran
Join Date: Dec 2002
Posts: 706
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Quote:
Positive offset is where the hub is further out than the centreline of the wheel, where as negative is the reverse. The amount of offset is measured from the centreline. Some people refer to backspace, which is the distance from the hub to the inside edge of the wheel. |
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__________________
"If a man could be crossed with a cat, it would improve the man but deteriorate the cat." Mark Twain
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27 Oct 2003, 04:59 (Ref:764102)
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#4 | ||
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Veteran
Join Date: Oct 2002
Posts: 1,618
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should be pointed out that it also effects the steering because it affects where the kinpioni axis intersects the contact patch, which changes the selfcentering behavoir in a couple different ways.
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__________________
I refuse to let fact get in the way of my opinion
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27 Oct 2003, 20:09 (Ref:764975)
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#5 | ||
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Racer
Join Date: Jan 2003
Posts: 299
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I think there might be a misunderstanding here. There are two different offsets to consider:
Wheel Offset (to kingpin): As already described, is an issue of geometry, and affects the steering performance and feel. Hub Offset: This is the position of the hub-to-wheel mounting surface, across the width of the tyre. This is an issue of: - Packaging - Design loads (particularly the wheel bearing) - Use of standard parts The F1 boys like their big, fan-assisted brakes well out of the way of the airflow. To achieve this, the mating surface is a long way outboard of the wheel centre. The best example, though is trucks and large vans that use twin-wheel rear axles. The separation of the twi tyres is achieved by having a very deep wheel disc, that extends beyond the edge of the tyre. Since it is impractical to caryy two different spare wheel/tyre assemblies, the front wheels also have to use this deep disc (often matched to an extended hub). Take a look at an Iveco or Leyland truck for a good example. There is no reason for this to be zero, or any other figure - it all comes down to how the designers decided to package it. If you are considering changing the wheels on your car, you need to know the existing hub offset and match it , whether by: - Finding a set of wheels that match the original design spec. - Adding spacers - Shaving back the centre mount of the wheel - Machining a new hub Otherwise you have changed the geometry, and may have compromised the bearing life. |
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14 Nov 2003, 22:48 (Ref:783741)
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#6 | |
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Racer
Join Date: Mar 2002
Posts: 248
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so do most wheels having the mounting in the centre then with zero offset?
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