3 piece comp wheels and wheel construction
3 piece comp wheels and wheel construction
(OP)
Wheel questions
It seems that it used to be that a lot of comp wheels were 3 piece construction. Now it seems that most are 1 piece, any particular reason for this?
Wondering out loud – if one where to look at (and the word is ‘look’ at) making a set of custom wheels – having the required lip data, stress calculations etc. What would be the material selection process and manufacturing process – also post machining and finishing.
You see the custom one off designs from Boyd or Foose (and others) / CNC’d and polished and away they go, just wondering what is involved.
Thanks
It seems that it used to be that a lot of comp wheels were 3 piece construction. Now it seems that most are 1 piece, any particular reason for this?
Wondering out loud – if one where to look at (and the word is ‘look’ at) making a set of custom wheels – having the required lip data, stress calculations etc. What would be the material selection process and manufacturing process – also post machining and finishing.
You see the custom one off designs from Boyd or Foose (and others) / CNC’d and polished and away they go, just wondering what is involved.
Thanks





RE: 3 piece comp wheels and wheel construction
Regards,
Cory
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RE: 3 piece comp wheels and wheel construction
RE: 3 piece comp wheels and wheel construction
That the rim and the spider or center disk can be in different materials, hence, stiffer higher tensile material might be used for the spider, and a lighter or tougher material might be used for the rims.
It is relatively easy to change rim width and offset.
A damaged rim can easily be replaced without replacing the entire wheel. This allows for much greater flexibility with a limited spare parts inventory.
Regards
eng-tips, by professional engineers for professional engineers
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RE: 3 piece comp wheels and wheel construction
Cheers
Greg Locock
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RE: 3 piece comp wheels and wheel construction
Thanks
Steve
RE: 3 piece comp wheels and wheel construction
The trick with aluminium is to design something that is strong enough in impact. The trick with steel is to design something that is fatigue resistant.
Cheers
Greg Locock
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.
RE: 3 piece comp wheels and wheel construction
Regards
eng-tips, by professional engineers for professional engineers
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
RE: 3 piece comp wheels and wheel construction
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For some insight. I think I used the same spinners and laser people.
Cheers
Greg Locock
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.
RE: 3 piece comp wheels and wheel construction
I was thinking more along the lines of using the front and back rim from a comp wheel - with the required offset and make up a center and bolting these to a center as the Compomotive FF wheels (years ago)
If I treat this as a mental project, I can have some fun with the artistic design and 3d modeling isn't a problem.
1) I am not sure who may have dimensional information of these rims - I used to at one time have an extensive catalog showing the available sizes - but alas no longer. - any idea?
2) Trickier would be the analysis - determining loads to design the center. - suggestions for reading?
Thanks
Steve
RE: 3 piece comp wheels and wheel construction
I strongly recommend this - getting the weld across the rim right is very tricky. If you are in Australia then ROH wheels in Melbourne are a great bunch to work with. (Amazing, Greg enthusiastic about a vendor!). Or more crudely, buy a complete wheel and unweld the spider from the rim.
2 There's an SAE spec for a rolling fatigue load. For a steel wheel that seems to be worst case. It applies a load at 45 degrees to the rim. More generally, design for 6 times the corner load, but you should find that fatigue is the killer. Note that all those fancy bends in the spider are there for a reason - you have to make the thing flexible so that the loads get shared among all the welds. Designing spiders is fairly tricky, more than one manufacturer has had problems with them.
Cheers
Greg Locock
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.