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02-19-2010, 01:25 AM | #1 |
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All You Ever Wanted to Know About Wheel Performance Standards
This is intended to be an information thread to better everyone's understanding of performance testing on wheels... so that we won't be buying wheels just based on looks
I am by no means a wheel expert, so this will be a working document, and I will add more information as people reply to this thread. Performance Standards/Specifications From what I've read there are several major performance specifications for wheels from:
Are Performance Tests Mandatory? It depends on where you live. In Japan for example, all alloy wheels for passenger cars (with 3, 5, and 7-number plates) to receive JWL/VIA approval to be legal for sale. In the U.S. however, there are only dimensional requirements per D.O.T. but no performance requirements. What's Involved in These Tests? I have to be honest here, so far I've only scanned through the JWL/VIA and SAE J2530. So experts please chime in All these tests are based on the specific load rating of the wheel. For example, a wheel rated at 690 kg will be applied a load derived from 690 kg. A higher rated wheel will be applied a higher load during the tests, and hence more durable. But of course when the load rating is unnecessarily high, the wheel may become too heavy. Below are the key tests that are performed:
What Constitutes Pass or Fail? Generally a wheel should not fail at the end of these tests, i.e. present cracks, be significantly deformed, or lose air pressure. However, the actual passing criteria varies depending on the standard and test used. For example, JWL for trucks do not allow any deformation, while as JWL for cars only need to be able to hold air after the tests. This is all for now. Will add more later. Reference: www.jwtc.jp, www.wheelprofessor.com Last edited by rzm3; 02-19-2010 at 11:53 AM.. |
02-19-2010, 01:30 AM | #2 |
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Exceeding the Standards
Recently I came across a page on Rays Wheels. Below is a figure illustrating how Rays developed their own standards (JWL+R) on top of JWL.
For example, fatigue testing cycles have been drastically increased. And in addition to the JWL-standard 13 deg. impact test, JWL+R drops a 2200lb weight at a 90 deg. angle from ~5.5". And then the same wheel is used for an additional near 1 million cycles of radial endurance testing http://www.rays-msc.com/html/jwl.html Last edited by rzm3; 02-19-2010 at 11:53 AM.. |
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02-19-2010, 11:57 AM | #5 |
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Thanks
(always wondered what TUV was)
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06-17-2010, 03:13 PM | #7 |
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Great info. Ray's JWL+R mimics what most JDM OEMs do already as a minimum. Impressive for an aftermarket wheel company to pony up and do the extended testing. This is a good example on how OEM requirements compare to aftermarket.
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03-22-2011, 09:02 AM | #9 |
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Video of a Side Impact Test
This is from Weds comparing one of their JWL/VIA tested and certified wheels to a "replica" wheel. Thanks to Dave@WSTO for originally posting the video.
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03-06-2012, 06:49 PM | #10 | |
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A Great Explanation of TUV
In another thread Lon@HRE explained TUV certification in detail and HRE's compliance. Lon's explanation follows. Thanks to Lon for this great information.
Quote:
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Last edited by calintexas; 08-06-2012 at 05:13 PM.. Reason: Updated information. |
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