How to identify Rim size/ make ?

Submitted: Monday, Apr 13, 2009 at 11:46
ThreadID: 67792 Views:16833 Replies:3 FollowUps:2
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Greetings -- a continuation for my trailer that i am getting registered -- going to put new rims and tires on it .. but not sure what stud pattern is on the Trailer nor how to work it out ?? hopefully one of the tire/rim experts on here can id by numbers -- if not maybe via photo ?

anyway details as follows

Tire on the rim 185 14c so its a 14 inch rim

5 stud and the spacing appears to be 71 mm PCD ( Or 71 mm between centers of each stud)

looking to buy some tires/ rims of ebay so need to know what they could possibly be, holden ?


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Reply By: Member - Graham H (QLD) - Monday, Apr 13, 2009 at 12:07

Monday, Apr 13, 2009 at 12:07
Have a look on the inner side of the rim as in the side away from the road and clean around the rim and you should see a set of numbers stamped into the metal

J 16 x8 JJ TOPY 1008 03 58.0

Similar to that which is a 100 series rim

AnswerID: 359366

Reply By: Rossc0 - Monday, Apr 13, 2009 at 12:53

Monday, Apr 13, 2009 at 12:53
Just as a help PCD (pitch circle diameter) is not the distance from one stud center to another. It is the diameter of the circle that all the studs are on with the center of the circle being the center of the wheel.

Holdens are about 102mm, Ford Falcon are 114.3mm, F100 138mm.

You will also need to consider the center hole diameter, eg early Falcon (pre 1972) is smaller than later falcon and while you can fit a late model wheel on an earlier model you can't do the opposite.

Based on the details here:

PCD Calculator

they are probably holden rims.

These are the most common trailer wheels as most come with these standard and you only get ford,toyota etc if you specify otherwise.

AnswerID: 359367

Follow Up By: Rossc0 - Monday, Apr 13, 2009 at 12:57

Monday, Apr 13, 2009 at 12:57
Sorry should have looked closer it's not a holden as that would be 100 for early and 108 for later not 120mm as from that site.

FollowupID: 627368

Reply By: That Troopy Bloke (SA) - Monday, Apr 13, 2009 at 13:00

Monday, Apr 13, 2009 at 13:00
Firstly, PCD stands for pitch circle diameter, which is an imaginary circle drawn through all 5 studs.

To work out your PCD, divide your 71mm by 0.58778 = 120.79mm.
This would suggest that your rims are Holden HQ to WB.
The trap here is that Commodore rims are similar....but not close enough to be interchangeable.

If you have access to vernier calipers, you can accurately measure across 2 of the studs and subtract the diameter of one stud, this will give you the correct spacing. For HQ to WB it should be 70.91 (120.65mm or 4.75" PCD), for Commodore it should be 70.53 (120mm or 4.724" PCD)

Hope this helps.

AnswerID: 359368

Follow Up By: Member - Charlie M (SA) - Monday, Apr 13, 2009 at 14:05

Monday, Apr 13, 2009 at 14:05
More info on wheels
Commodore has 43mm Positive offset (Early 14 & 15inch wheels)
HQ has 13mm Positive offset
which needs to be taken in account or wheels may hit on springs
FollowupID: 627372

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