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Try
Car Bibles : The Wheel and Tyre Bible Page 2 of 2
for an excellent description of rim profiles.
It appears that J and K rims have different profiles and according to the author tyres designated for J rims absolutely will not fit on a K rim...nor vice-versa
cheers
Sorry...missed Phillip's reference to same URL (Cars Bible) in previous post :(
I think the Car Bible showed a less than biblical knowledge.
Although it is strictly illegal, I have heard of many tubed tyres being put on tubeless rims with no problems and Vice versa.
On a trailer the consequences could be less if a tubeless lost pressure then came completely off the (K with no bumps) rim than on a car, depending on the weight of the trailer of course.
Regards Philip A
Ok guys, here is the run down.
First up, I made a mistake, (rims were already in the shop getting tyres removed when I wrote the first post, to which I now have them back),
Part number is NRC7900. They are a tubed tyre rim. There is no safety bead on the inside.
Just started getting rid of the paint on them, since there is surface corrosion bubbling underneath the grey paint, which has been the result of a bad prep job when they were repainted.
I think I might get them media blasted back to alloy, and repainted white to suit the trailer. Already organised with one of my mates who is a spraypainter to get them done next time he's at our work.
Many thanks for the replies
Chris