Interceptors J and JJ differences

[VHCOMMO87]

Hey all i have 4 x interceptor rims.

2 x 15x7jj
1 x 15x6jj
1 x 15x6j

What is the difference between the jj and the single j on the rim?

Cheers all.

 

[dgp]

The jj have a higher load rating, not sure exactly what it is though.

 

[Bigfella237]

From memory it has to do with the shape of the flange where the tyre mounts to the rim, I think the "J" refers to a "safety bead" that's suppose to keep the tyre in place even if it goes flat, so you retain at least some control of the car if you have a blowout at speed.

I could be wrong of course but I think the difference between "J" and "JJ" is that the former only has one safety bead whereas the latter has a safety bead on both the inner and outer?

There are also other flange profiles around like "B" and "K" (you see these mostly on really old rims) and you have to ensure the tyres you fit to these rims suit the shape of the flange.

I have it in the back of my mind that Australian Design Rules specified that all rims be "JJ" decades ago for safety reasons, maybe someone can confirm?

Andrew

 

[VHCOMMO87]

The jj have a higher load rating, not sure exactly what it is though.

Ah ok, so are they physically the same size measurement wise?

 

[VHCOMMO87]

From memory it has to do with the shape of the flange where the tyre mounts to the rim, I think the "J" refers to a "safety bead" that's suppose to keep the tyre in place even if it goes flat, so you retain at least some control of the car if you have a blowout at speed.

I could be wrong of course but I think the difference between "J" and "JJ" is that the former only has one safety bead whereas the latter has a safety bead on both the inner and outer?

There are also other flange profiles around like "B" and "K" (you see these mostly on really old rims) and you have to ensure the tyres you fit to these rims suit the shape of the flange.

I have it in the back of my mind that Australian Design Rules specified that all rims be "JJ" decades ago for safety reasons, maybe someone can confirm?

Andrew

So it should not matter if i fit 3 x jj and 1 x j. Cheers

 

[Bigfella237]

A "6J15" and a "6JJ15" are both 6" wide (between the beads) x 15" diameter, but you'd need to check whether a "J" rim is legal to use, I think you'll find that the odd rim may be off an imported vehicle or similar?

I also recall that any rim fitted to a vehicle must have the manufacturer's name stamped into it too?

Andrew

 

[VHCOMMO87]

A "6J15" and a "6JJ15" are both 6" wide (between the beads) x 15" diameter, but you'd need to check whether a "J" rim is legal to use, I think you'll find that the odd rim may be off an imported vehicle or similar?

I also recall that any rim fitted to a vehicle must have the manufacturer's name stamped into it too?

Andrew

They are all GM interceptors which came off holden vehicles i got them from a holden wreckers. They have the GM stamped on them. To look at them they are all identical.

 

[VHCOMMO87]

I just rang 4 different wheel and tyre shops and they all said it makes no difference and you can run that rim with the other 3 no problems, they said the dimensions are the same..

 

[dgp]

I stand corrected

 

[Trayner]

Would probably be for the commercial vehicles utes, one tonners , crewmans . For the higher load rating ?