Thread: RRC alloys different part numbers

I think they are the same.

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

Originally Posted by 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

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

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

Oops, beat me to it Roger .

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

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

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

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 !