Different Speedlines

[ORB 227 1 Cars]

Hmm.

 

I have just been in the garage and I am working on a set of wheels (refurb, different story) and I notice that they have different markings.

 

Three of them have a stamp between the 'Speedline' and 'Italy' saying JJL (or JJL) and one of the wheels does not. I have seen this stamp before on many alloys. Did speedline sub-contract the manufacture of them? The one without the JJL/JLL stamp seems notably lighter in weight....

 

Also, they are all stamped with SL299, but they all have a different number after, I have a SL 299 2, SL 299 4, SL299 7 - Whats that all about then?

 

Sorry, was just bored so thought I would ask.

 

(hope the above makes sense, I am well into my 2nd bottle of red)

[Baz 421]

I've always though they're just a batch number or similar tbh.

[ORB 227 1 Cars]

Yeah Baz, I also noticed today that they have different date stamps on the inside of the wheel. Wonder if these make a pattern?

 

What about the JLL/JLJ/LJJ stamps?

[Flozman 4]

Yeah Baz, I also noticed today that they have different date stamps on the inside of the wheel. Wonder if these make a pattern?

 

What about the JLL/JLJ/LJJ stamps?

 

Ive always wondered that myself, but ive noticed TSW, BBS, Speedlines and SMR's all have these markings.

[Henry Yorke 269 3 Cars]

Also, they are all stamped with SL299, but they all have a different number after, I have a SL 299 2, SL 299 4, SL299 7 - Whats that all about then?

 

This will be the mould number. When I worked for a glass bottle company, the bottles had all sorts of info stamped onto them. The mould number assists if there is a recall or a defect found.

[rallysteve 22]

Its actually JWL, its like a type approval for wheels, means they meet specifications for road use, much like Emarkings on road legal tyres

 

Steve

[kyepan 291]

Its actually JWL, its like a type approval for wheels, means they meet specifications for road use, much like Emarkings on road legal tyres

 

Steve

that's what my dad said it was too.

[Rich_p 23]

Stolen from another forum!

 

 

Performance Standards/Specifications

From what I've read there are several major performance specifications for wheels from:

 

SAE (Society of Automotive Engineers)

TÜV (German regulatory agency)

ISO (International Standards Organization)

JWL (Japan Light Alloy Wheel Standard, VIA conducts the tests)

 

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:

 

Dynamic Cornering Fatigue Test - This is a test that simulates the forces/moments put on a wheel when the vehicle is turning a corner or going around a curve. For JWL, a bending moment (based on load rating, load radius, offset, etc.) is applied for at least 100,000 revolutions.

 

One interesting note here is JWL requires a higher safety factor (e.g. more load) for cast wheels (2.0) vs. forged (1.5). I guess this is why a properly designed cast wheel can be just as strong/durable as a forged wheel... but of course the cast may be heavier due to more material used.

 

 

Dynamic Radial Fatigue Test - The main purpose of this test is to check the durability of the wheel disc. This is a test that simulates the forces that the wheel experiences with a tire mounted and carrying the weight of the vehicle, passengers and/or cargo.

 

Here for JWL a radial force 2.25x the load rating is applied for over 500,000 revolutions!

 

Impact Test - This is a test designed to test the effect on the wheel in the event of an impact to the wheel such as hitting a pot hole or side impact into a curb. This test mainly checks for tire air retention and confirms the strength of the structure joining the rim and disc. The test basically involves the dropping of a weight at various locations on a wheel.

 

 

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.

[ORB 227 1 Cars]

OK, Further research.

 

I have a one of them brains that saps info where I can find it. The numbers thing on the Speedlines was interesting me a little. I had to find out more.

 

I have been back to my only 'set' of four that I can get my hands on to learn a bit more.

 

I noticed on the back that they are all date stamped and have a serial number.

 

Here is what I found on a 'set' of four:

 

Wheel 1

Number SL299 4

Date 89

Code T9E

JWL Stamped

 

Wheel 2

Number SL299 1

Date 90

Code C5T

JWL stamped

 

Wheel 3

Number SL299 7

Date 88

Code T10D

JWL stamped

 

Wheel 4

Number SL299 2

Date 87

Code T14B

No JWL stamp

 

 

 

 

So, now I need to know more. Do you have a speedline that is laying around and you can get to the numbers? I would like to see if any patterns emerge? It would also be interesting to see if anyone has a matched set? I know the four that I have here are from misc wheels I had laying around...

 

Post up your numbers.

 

You may need to wire brush off the crap on the inside of the spokes to see the stamping, but it is all there.

[Baz 421]

I may be some time...

[ORB 227 1 Cars]

No one want to play?

[welshpug 1,657]

give baz a chance, he has lots of wheels to have a look at