RRC alloys different part numbers

[eb220]

Guys,

I just picked up another set of rims (for my trailer and multiple spares) and they have a different part number from the set on my Classic.

On the RR the part number is NTC1346 (7Jx16x33.0)
The new set has NTC1900 (7K16x33.0)

I haven't checked the offset yet, but does anyone know if there is a major difference between the K and J versions?

Cheers

Chris

[Psimpson7]

I think they are the same.

[Lotz-A-Landies]

Can't be sure about the part numbers as I don't have those books. However I can tell you that the first of the RRc alloys (1985 model) were all silver and were for tubed tyres only.

The offset and width are the same 7" as the later tubeless of the same pattern. The tubless rims have that information in the casting. Most if not all the tubless ones were dark grey or colour coded to the car.

Diana

[Xtreme]

Can't be sure about the part numbers as I don't have those books. However I can tell you that the first of the RRc alloys (1985 model) were all silver and were for tubed tyres only.

The offset and width are the same 7" as the later tubeless of the same pattern. The tubless rims have that information in the casting. Most if not all the tubless ones were dark grey or colour coded to the car.

Diana

Didn't I also read in another post (I think it was about WOLF Rims) that the 'K' indicated that they were tubed type rims and the 'J' indicated tubeless?
Best to check the new rims to see if they have a safety bead for the tubeless tyres.

Roger

[Scouse]

I haven't seen this myself to confirm it, but earlier RR alloys were tubed type so this may explain the different part numbers.

[Scouse]

Oops, beat me to it Roger :).

[eb220]

So, thinking logically, as J (on the truck) is alphabetically before the K, the K's are newer, and part number, numerically makes the K newer.

As an aside, I got a puncture in one of the wheels on the truck the other day, the tyre was a tubeless.

Have found a parts manual, will check out what it says.

Cheers for the help so far, will let you know more as I find it out.

Chris

[PhilipA]

With logic like that , I have a great bridge to sell you.
J refers to the rim having a safety hump to restrain the bead of the tyre after a blowout, hence JJ on many cars( one each side).

Car Bibles : The Wheel and Tyre Bible Page 2 of 2 (http://www.carbibles.com/tyre_bible_pg2.html)

Not very clear but I am sure that J refers to the safety hump just in from where the bead sits, or maybe more fully the shape of the bead area which includes the hump. K has no hump.
Regards Philip A

[pomonastik]

i seem to remember another difference was the valve hole.
ntc 1346 is definitely a tubeless rim
i've got no listing for ntc 1900
but ntc2310 and ntc 2320 are the lo and hi-line tubed type respectively
there was even a lo-line tubeless rim, ntc 2770.
ntc 1346 was also available in 14 alternative colourways, denoted by a 3 letter suffix.
ntc1346nuc sounds nasty- alpine white wheels- yukk !

[PhilipA]

White ones go on a white Vogue SE 92.
When I bought mine Aspen/Grey Vogue, there was a Vogue SE next to it.
Aside from the air suspension which I didn't want, it was white with cream leather with white wheels. I asked why it was cheaper than mine, and was told by Garthon's sales guy that nobody liked the colour/trim.
I wonder why. Even I didn't like it and I am not sensitive to such things.
Regards Philip A

[Hoges]

Try
Car Bibles : The Wheel and Tyre Bible Page 2 of 2 (http://www.carbibles.com/tyre_bible_pg2.html#rimcontours)

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

[Hoges]

Sorry...missed Phillip's reference to same URL (Cars Bible) in previous post :(

[PhilipA]

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

[eb220]

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