panhead
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For those interested, I finally got an answer back from Holden, this is what the 'JIS 48' means:
"JIS stands for Japanese Industrial Standard. This is the governing body in Japan that control and stipulate standards for Industry in quality and manufacture. These standards are often recognised worldwide. JIS 48 relates to metal and metal alloy as used in the wheel".
So there goes my theory. I have emailed back and asked them for the offset of my rims, so even though I worked it out at 48 (that was with the tyre on unfortunately, so could not accurately work it out from the dead centre of the rim), I am assuming that's wrong, and they will be 40.
I don’t think that info is correct.
From what I’ve always been told the J is the symbol for the type (shape) of rim contour and is often referred to as the bead profile where the rim meets the tyre.
J is the most common contour design for most passenger vehicles and it will be stamped into the rim after the width.
There are a number of other contour profiles for the rim lips which all have their own designated letter.
Symbol & Usage
A = Bicycles, mopeds, motorcycles, scooters, vans, lorries, forklifts
B = Old wheels up to 6" wide, sometimes found on the old VW Beetle
D = Bicycles, mopeds, motorcycles, scooters, vans, lorries, forklifts
E = Lorries, vans, tractors (front wheel drive) with "semi-drop" wheels (see below)
F = Vans, lorries, forklifts with "semi-drop" wheels
G, H = Vans, lorries with "semi-drop" wheels
J = Passenger cars
JJ = 4x4 SUVs
P, K = Found sometimes in older cars such as VW Beetle, Jaguar
S = Commercial vehicles with "flatbase" wheels
T, V = Commercial vehicles with "flatbase" wheels
W = Agricultural tractors, mainly on the rear axle
EH2 = Run Flat for some manufacturers
The IS48 means positive 48 offset.
ET is the most commonly used symbol but manufacturers like BMW have always used the symbol IS to indicate offset and you will also find it on other rims depending on the manufacturer.
Here’s a couple of photos of the markings on my OEM HF-20 from my 2016 Redline.
Front Rim
Rear Rim
.
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