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Type rims? and tires

Discussion in 'Norton Commando Motorcycles (Classic)' started by Joe Schlaberdowski, Oct 31, 2017.

  1. Joe Schlaberdowski

    Joe Schlaberdowski

    Jan 1, 2017
    Trying to get a '74 850 with unknown history roadworthy. I looked last night and didn't see any markings on the rims. Front and rear do look the same though. They don't look rebuilt (or "relaced") either. May be original. New looking Avon on the rear. Weather checked Dunlop on front. Maybe I just missed a marking on the rim -- so the question is, are all rims marked? And for good handling road tires, front and back, what Avons are reccomended? Not racing (and not always cruising like on a Harley either), but want good handling. And last, but not least, are all inner tubes created equal?
  2. baz

    baz VIP MEMBER

    May 26, 2010
    My preference is Avon roadriders,and Michelin tubes
  3. Bob Z.

    Bob Z.

    Mar 30, 2012
    The original chromed rims would have stamped ID markings at the inner tube stem hole.
    I think the original front rim for the disc brake was specific for the spoke hole dimple angles.
    Lots of tire choice threads to read through.
    Personally I use the newly Made in Japan 4.10-19 Dunlop K81.
  4. L.A.B.

    L.A.B. Moderator VIP MEMBER

    Nov 20, 2004

    The '74 Dunlop Commando rims would normally be marked 'MC 275' front, and 'MB 41' rear (or MC286 rear, with .300" spoke nipple holes?) also both would be marked 'WM2 - 19'.

    As Bob Z. says, the difference in hub diameter and offset between the disc and drum wheels results in different spoke angles, so the nipple holes in the rim must be punched/drilled to match.

    Edit: It has been reported in previous discussions that some 850 Mk2/2As had a 'Jones' instead of Dunlop rear rim.
    Last edited: Oct 31, 2017
  5. Onder


    May 11, 2010
    Michelin Air Stop is the tube I use after finding the others (ie cheapies) to lose air slowly or not so slowly over time.
  6. SteveA


    Dec 20, 2011
    I have had Michelin tubes also lose air slowly over time, say over winter, but this is not recent experience and they are still my preference for tubes! My guess is they are heavier than others! But in the case of tubes I will live with that.
  7. gortnipper

    gortnipper VIP MEMBER

    Nov 11, 2013
    These are the rims that came off of my 74 mk2


    Joe Schlaberdowski likes this.
  8. Fullauto

    Fullauto VIP MEMBER

    Apr 13, 2009
    Avon AM26 100/90 x 19 Roadriders at both ends. You won't find better.
  9. pantah_good

    pantah_good VIP MEMBER

    Jul 17, 2015
    Ten or so years ago when we were racing AHRMA, Michelin tubes were highly recommended as being the best and lightest by our Dunlop race tire vendor. Still using only them and have never had any problems.
  10. JimNH


    Jan 4, 2014
    RoadRiders here too.
  11. peter12


    Jun 18, 2013
    The photos by Gortnipper show rims identical to mine on a 850 mk2a. I use Roadriders, on the original 19" rims, am considering having the rims re plated.
  12. gortnipper

    gortnipper VIP MEMBER

    Nov 11, 2013
    Some bare component weights:

    Dunlop rim 2552 grams
    Jones rim 2662 grams

    Front spoke set 1002 grams including nipples
    Reard spoke set 625 grams including nipples

    Front hub 1501 grams naked
    Rear hub 2912 grams naked.

    I had some Excel shouldered alloy WM3 wheels built:

    19” Front wheel:
    With hub, bearings and 8/9 gauge SS spokes weighs 11.11 lbs.
    Add rim strips, tube and a new Avon AM26 100/90 weighs 23.4 lbs
    Add CNW Brembo disc weighs 26.7 lbs

    18” Rear wheel:
    With hub, bearings and 8/10 gauge SS spokes weighs 12.8 lbs.
    Add rim strips, tube and a new Avon AM26 4.00 weighs 27.7 lbs

    So, front weight with alloy rims essentially saves bearing weight. And rear 18" saves that and a pound.
    Last edited: Nov 1, 2017
  13. gortnipper

    gortnipper VIP MEMBER

    Nov 11, 2013
  14. illf8ed


    Dec 30, 2003
    Have never seen a Jones rim as original on a Norton. Rear typically would have been Dunlop MB41 as mentioned above by the moderator and was used on all Norton models with full width brake drum from singles to twins. Jones was used as OEM on BSAs.
    Joe Schlaberdowski likes this.
  15. candyapplered


    Mar 7, 2010
    I also have a Jones rim on '74 Mk 2A.
  16. Torontonian


    Dec 28, 2009
    You will be happy with Avon Roadriders front and back.
  17. gortnipper

    gortnipper VIP MEMBER

    Nov 11, 2013
    I think that for 74, and maybe late 73, there were quite a few that rear wheels that were fitted from the factory with Jones rims. I think it is too common to be owners doing this early on.

    Last edited: Nov 1, 2017
  18. Joe Schlaberdowski

    Joe Schlaberdowski

    Jan 1, 2017
    Cleaned off rear rim and found "M.M. 2.19 JONES 91 0033" on chain side of wheel. Now this was pretty worn, but I think the first two letters were M.M. And on the "2.19", the "1" could have been a "7". Also, the top of the first "0" from "0033" was missing. Couldn't find anything on the other side. Would this have been the same from wheel to wheel, or were some of these numbers like serial numbers?
  19. gortnipper

    gortnipper VIP MEMBER

    Nov 11, 2013
    That is consistent with my stamping, and I think is just that the stamping was shallow/incomplete due to a worn stamper rather than wear on the rim.

    It is not "MM", but a "W.M 2.19" - which is the rim size. WM = Mean overall tyre width.

    the full stamping on mine is "W.M.2.19 JONES 91 0033"

    Not sure what the "91 0033" stamp means. It doesnt follow a date stamp format that is normal for other things I am familiar with in that era (tubes/valves, Garrard turntables, etc) , but may be a batch code. Dunno.

    Across the spoke holes on my rim is "MADE IN ENGLAND".
  20. concours

    concours VIP MEMBER

    Dec 29, 2011