Steel Rims

Submitted: Thursday, Feb 21, 2008 at 23:04
ThreadID: 54801 Views:3228 Replies:3 FollowUps:2
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I am looking to buy an extra rim for my van.
Marked on an ROH rim I have seen is 7JJ x 15 and another unnamed ( but I think Sunraysia) rim has 7J x 15, does anyone know if this "JJ - J marking is the Offset and if so how much difference is there?

eerfree
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Reply By: Wayne's 60 - Thursday, Feb 21, 2008 at 23:25

Thursday, Feb 21, 2008 at 23:25
Hi eerfree,
The basic answer is no, J and JJ does not relate to offset.
You may be able to glean some information from this link Tyre and Rim Information scroll down to the information on tyre bead profiles & rim contour designs (don't understand much of it myself) and it may explain it better.
There is some interesting information on tyres in these pages.

Cheers,
Wayne.

AnswerID: 288747

Follow Up By: Member - eerfree(QLD) - Friday, Feb 22, 2008 at 13:06

Friday, Feb 22, 2008 at 13:06
Wayne
Thanks very much for that, that is a great website, I am not sure I understand what he is talking about but you have cleared up my original question
Thanks

eerfree
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FollowupID: 554139

Reply By: Member - Phil G (SA) - Friday, Feb 22, 2008 at 15:49

Friday, Feb 22, 2008 at 15:49
Measure the Backspacing of each of the rims. If they are the same, then you're OK.
AnswerID: 288823

Reply By: Member - Oldplodder (QLD) - Friday, Feb 22, 2008 at 18:28

Friday, Feb 22, 2008 at 18:28
Got caught once with this one too.

The JJ and J difference is the radius at the lip of the rim and base of the rim lip.

From memory one is like 6mm and the other 12mm.

JJ is the newer specification.

The bead on the tyre should be the same to suit, so it seals properly, but in practice you could get away with it to get you out of trouble.
But I wouldn't put a tyre on the wrong rim for long term use.
AnswerID: 288846

Follow Up By: Member - eerfree(QLD) - Saturday, Feb 23, 2008 at 21:37

Saturday, Feb 23, 2008 at 21:37
Phil and John
Thanks very much for the replies, more research is required!!!

eerfree
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FollowupID: 554352

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