What does JJ on wheel mean?

[Guest]

I saw a 15 X 7 wheel for auction and was wondering what the JJ code stamped on the wheel meant? Is this a production code? Thanks.

[Guest]

I have some wheels of a 67 GS that are stamped JJ 14x6. Since my all my tools and all my reference books got stolen by some son of a b*tch theif (Assembly/Chassis/Body-Master Parts plus the Hollander!) I can be of little assistance other than this ... JJ stands for Janet or Joe Jackson

[NTX5467]

The two letter code you speak of refers to the style of the rim lip or bead area--height, shape, etc. I recall that there are several variations with different letter codes for them. These codes are totally independent of the rim diameter or width.<P>Enjoy!

[Guest]

<P> The JJ identifies the offset. It is usually seen right after the diameter and rim width.<P> Bob Rich

[Guest John Chapman]

Bob Rich...<P>I dunno about that... I've got four 14x6 rims... three with 4" offset, one with 3.5" offset... all stamped 'JJ'. Could be the one isn't stamped correctly...<P>JMC<P>------------------<BR>John Chapman<BR>BCA 35894<BR>1965 Skylark Convertible (Some Assembly Required)<BR> jmchapman@aol.com

[Guest]

<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by John Chapman:<BR><B>Bob Rich...<P>I dunno about that... I've got four 14x6 rims... three with 4" offset, one with 3.5" offset... all stamped 'JJ'. Could be the one isn't stamped correctly...<P>JMC<P></B><HR></BLOCKQUOTE><P><BR> A perfect example of why you should not believe what you see on the Net. Or, as my nephew is fond of saying "Wrong AGAIN, Bob"<P> The code is, indeed, a reference to the standardized area the tire "sees" on any given rim. A full explaination of the dimensions the code refers to is given in a handbook available from the Tire and Rim Association located in Oakley, Ohio.<P> Sorry for the bum info.<P> Bob Rich<BR> <BR>

[Guest John Chapman]

Nice bit of research. Complex world we live in. Sounds like your nephew took lessons from my ex-. His language is a bit milder, though.<P>Cheers,<BR>John

[NTX5467]

Thanks for verifying my previous post Bob. I could not find my archive information on that subject, but knew I saw it back in the 1960s.<P>There are some other stamp codes on GM wheels which can relate to other aspects of the wheel other than rim diameter and width. These stamps are typically near the valve stem hole (steel wheels) or on the reverse side (aluminum wheels). Typically, these stamp codes are three letters ("RAL" is one that comes to mind for a late model Chevy light truck wheel) and will need a GM parts book to determine the what the wheel came on.<P>For example, two "identical" wheels with different stamp codes might also relate the vendor who built them for GM--not to mention how the wheel is shaped on the inner side to clear things (such as disc brakes instead of drum brakes), if the wheels are "directional", plus the other items I will mention below.<P>I understand, for example, that there are different stamp codes for the 15" Riviera chrome wheels (1960s-70s) as opposed to the similar looking wheels which came on other Buicks of those and later years. I believe these intracies were detailed in an ROA club magazine article on such.<P>These codes can also relate to offset due to their particular vehicle applications. For example, the "common" Chevy 15x7 Rally wheel has two variations that I know of--one for Malibus/Monte Carlos of the late 60s and early 70s and one for Corvettes. In that case, the wheel offset is the significant difference as they otherwise look the same until you put them side by side. The Corvette wheel is basically "O offset" while the other variation is the "normal rear wheel drive" Chevrolet offset.<P>These additional codes might be more information than you might have wanted, but it can make a difference in how the wheel works on the vehicle not to mention concours judging situations. There might also be some date code stampings which might also be significant in some judging situations.<P>Enjoy!

[Drubthob]

http://www.rimsandtiresmag.com/how-to-identify-wheel-markings/

How to Identify Wheel Markings

Feb 24, 2015

If you are looking at installing new wheels onto your vehicle, you need to know what the different wheel markings are. The markings along the side of the wheel can point you to very important information that can help you identify not only the right wheels for your particular needs but also what kind of attributes each has. Due to this, going over this kind of information is extremely beneficial and it can help you save time and money, so you always purchase the right kind of rims and wheels the next time you are in the market.

Where And What To Look At

Located on the inside of the wheels, there is a series of markings, numbers and lettings you are going to find. You need to know what each piece of information means, otherwise it just looks like gibberish. Let’s take this one for example:

7J x 16 H2 5/120 ET47

 

7 – rim width. For starters, the first series of numbers is going to be the size of the inner width of the wheel in inches. This might look like 6 ½ or 7, 7 ½ or something similar. Regardless of the number, the first one present is always the inner width. If we apply it to our example we come to (7 x 25.4mm = 177.8mm). Following this initial number is a letter.

J – This is the shape of the wheels you are using where the tire bead sits directly on the tire wheels. This letter MUST BE exact match with your tire marking, but do not panic.  “J” is the most common profile identifier and most passenger car use these.

JJ, K, JK, B, P, A, D, S, T, W are just another bead shape designations used today. Most of each are characteristicfor a particular industry: forestry, agricultural, heavy lift machines, even motorcycles, but explaining all of them will exceed purpose of this text.

 

There is then going to be a lower case letter following it (such as an “x”).

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x – If there is an “x”, it means the wheels were constructed in one piece.

If you are interested in wheel construction more info you can find Casting VS Forging.

16 – The number following all above is the diameter of the wheels in inches. In our particular case rim diameter is (16 x 25.4mm= 406.4mm). Same number should appear on sidewall of mounted tire, so,  no compromise here.

If you need further assistance reading tire marks check article: Tire Codes – What Do They Mean?.

H2 – This is the kind of flange the wheels have. The flange is a bulge located on the wheels right in the location where the tire bead sits. It is going to help prevent the tire from falling into the wheels.

5/120 – Following this, there is an extensive fraction, such as 5/120 ( or 5 x 120). The first number indicates the number of bolts, or lug nuts used on the wheel (usually four or five). The second number is the Pitch Circle Diameter (PCD). This is an imaginary diameter (in millimeters) of a circle that runs through the center hole of the screws that hold the mounted wheels.

ET47 – The following number, which is the last wheel markings you are going to see, is the offset, which is the distance between the center line of the wheels and the plane of the hub that houses the mounting elements of the wheel. The offset is measured in millimeters. The number can have a positive offset, zero offset and a negative offset. A positive offset means the center line of the wheels is located further out than the center of the hub mounting element of the wheels. A zero offset means it is perfectly inline with the wheels mounting and a negative offset means the hub mounting element is further out than the center line plane of the wheels. In our case, offset is positive: 47 mm.

Conclusion

There is a surprising amount of information used in describing a tire and the wheels such are OEM, serial part, manufacturer etc. All of this is very important information that needs to be looked at when it comes to having new wheels and tires installed. Once this information is available and it is possible to locate the very best wheels possible, you can then decide which wheels are going to work best for you and which wheels can give you the desired level of performance that you are looking for. If available always consult user manual of your car, just to be sure.

Thanks