MKIII rear rim pattern

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AltaNorton

AltaNorton

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I'm still searching for an original rear rim for my '72 restoration. There's a good deal but it's for a MkIII rim. Do they have different spoke patterns seeing that it's a different hub for the rear disc brake, or will it fit the usual drum brake hub?

Thanks,
Matt
 
There is a different pattern of lacing in the rear for the disk brake hubs. Look at the Old Brits site and I believe they have the pics of the various models laced. Whether or not the angles of the punched nipple holes is different I'm not positive but I think it's different.
 
powerdoc said:
Whether or not the angles of the punched nipple holes is different I'm not positive but I think it's different.
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The 3 x 1 dimple pattern MkIII rear Dunlop MC289 rim and spoke pattern is different.
 
Hi , as far as I know the rear drum rim has the same pattern than the front drum rim, the hub is symetrical and that's what I order from central wheel.........
 
My MKIII rear rim is MC287 WM2-19. Could this be the wrong rim ? If so what year would it be from ? Just what dose the MC??? combo mean ?

Phil
 
Norton-Villier said:
My MKIII rear rim is MC287 WM2-19. Could this be the wrong rim ?
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Perhaps not? (Updated link)
https://www.accessnorton.com/NortonCommando/front-end-damage.628/#post-4441

My Mk3's rear rim is MC289 (front is MC288). Perhaps the Mk3 rims changed at some point during production?


Norton-Villier said:
Just what dose the MC??? combo mean ?
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It appears to identify rim diameter x width x dimple pattern x spoke hole angle etc., so the MC code number basically identifies the particular model (or models) of motorcycle which used that actual rim specification. It seems there is a sequence to the numbering system as the early Triumph WM2-19 disc front rim is MC284, and the T160 WM3-19 rear rim is MC285, however Triumph rims usually include the Triumph part number (37-xxxx) in addition to the Dunlop MC number which makes model identification easier.
 
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Hi all,
Something of a thread resurrection, but I'm just sorting out the bits to make my mk3 wheel rebuilt, and I've just noticed that the good used rim that I've bought as a replacement is marked MC289, whereas the wheel was built with a MC287. Both mk3 rear rims, but are they interchangeable? My bike was built in April '75 IIRC, so I guess that makes it an early mk3? Anyone know if the hubs are the same, and how the two rims differ?

Thanks you lot. I really must buy you a pint when we meet next, for all the help you've given me!

Jon
 
Check the spoke holes, it could be a simple difference in hole diameter that changes the number. If you put the rims next to each other 5 mins inspection will tell you any differences.
 
Boxerfan said:
I've just noticed that the good used rim that I've bought as a replacement is marked MC289, whereas the wheel was built with a MC287. Both mk3 rear rims, but are they interchangeable? My bike was built in April '75 IIRC, so I guess that makes it an early mk3? Anyone know if the hubs are the same, and how the two rims differ?
Click to expand...

The MC287 and MC289 rims should be interchangeable as there was no apparent change made to the MkIII hub that I know of, and there's only one part number for each item (rear rim, 06-6119 and hub, 06-6127) and the spokes weren't changed either as far as I'm aware?
As you have both types it should be easy enough to compare the positions and angles of the spoke holes?

If you do spot any apparent difference between the 287 and 289 then please let us know what it is.
 
Phew, sounds like I'll be ok if the hub hasn't changed- maybe they tweaked the drillings to make building easier? I'll check spoke holes etc & let you know if I can spot any differences.
 
If the hole size is the issue make sure your nipples are the correct ones, nipples pull through too large spoke holes.
 
There's about 6 thou' difference in hole size between the two, with the 289 being smaller. The only other things I spotted were that the289 is without the knurl in the rim that is on the 287, also the internal width of the 289 measures slightly larger - 40-60 thou' - more, but they're both WM2, so they should be the same.
 
Common nipple sizes are .250, .275 and .300, holes will be a few thou larger so 6 thou will just be a fresh drill vs a worn one, the width difference is odd, I will check some rims myself for differences, we are talking about tolerances in the 70's mind you.
 
Well the width variation seems ok, checked 3 old rusty wm2 rims and they varied by 20 odd thou.
 
Ace, thanks. I bundled the bits off to the wheel builder today, should look pretty tidy when it's built. I sprang for a new Roadrider while I'm at it, the old Roadrunner was 10 years old.

Cheers!
 
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