RGM 12" disc and OEM caliper ??

Discussion in 'Norton Commando Classic Motorcycles' started by BrianG, Oct 29, 2017.

  1. BrianG

    BrianG

    Joined:
    Sep 4, 2009
    If using the RGM 12" brake rotor, can one use the original caliper?
    or is it expected to use the replica race caliper?
    Either will require an adapter it seems, and I don't see RGM list a 12" rotor adapter for the OEM caliper.

    And if using the 2 piston race replica caliper, is there advantage to using the bore reduction?
     
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  2. Fast Eddie

    Fast Eddie VIP MEMBER

    Joined:
    Oct 4, 2013

    The 12inch disc requires their adapter plate AND race type caliper (either expensive AP, or cheaper Grimeca).
     
  3. B+Bogus

    B+Bogus

    Joined:
    Jun 28, 2009
    There are a couple of benefits. It does improve the brake, and it also opens up the options on pad material, which is pretty limited for the standard caliper.

    I have the RGM setup with an AP Racing caliper on my MKIIA and with a sleeved down master cylinder it's a powerful and progressive brake.
    The latest Ferodo pads work well too.

    There is an AP Racing replica caliper available now which is good quality and considerably cheaper than the AP

    Struggling with Flickr, otherwise I'd post a photo
    [​IMG]
    I have a spare adapter available, PM if interested.
     
  4. SteveA

    SteveA VIP MEMBER

    Joined:
    Dec 20, 2011
    Like B+Bogus said, there is now a cheaper replica of the AP caliper available, which is a real good copy, looks identical with the exception it does not say AP on it!

    RGM are selling it, and it is available on ebay about 60% of the AP item price from discounters. Read what RGM have to say about supply from AP, noting of course that main distributer of AP in UK is AN? The pricing makes it cheaper than the Grimeca at the best price I have found.

    I haven't checked it yet, but my assumption is that the copy part will take AP seals, no reason why it won't as far as I know, pistons are the same size and it does take available AP style pads so you have a range of pad choices, including road and race compounds, from Ferodo, EBC and even Bendix! Lost faith in Ferodo a bit after my last gearing change on my Rickman, when as I removed the rear wheel, the pad friction material fell out!
     
  5. ashman

    ashman

    Joined:
    Jul 10, 2010
    After my orginal front brake let me down badly and I got injured while recovering I went with the RGM 12" disc, Grimeca caliper as well as the Grimeca master cylinder with longer lever with SS brake line, all up this system works very well and has been on my Norton for over 6 years now without any problems, brake is one finger operation if you want setting this system up you be very happy knowing you have a front brake system that works, the orginal front brakes are just not up to the job, spend the money your life is more important.

    Ashley
     
  6. baz

    baz VIP MEMBER

    Joined:
    May 26, 2010
    Depending on your pocket depth the racing light weight APs are very good,but if you've got the equipment to do it and no money a 320 mm diameter disc is very good, with a nissin 4 pot caliper (£15) off fleabay and a 12mm brembo master cylinder I found on a scooter dumped in the brook is better
     
  7. BrianG

    BrianG

    Joined:
    Sep 4, 2009
    I'm thinking that if I'm going to go through all of this, a 320mm rotor with a Brembo, Nissin or Tokico 4 pot caliper would be the answer.

    The next question is what 320mm rotor to use and how to mount it to the wheel.
     
  8. baz

    baz VIP MEMBER

    Joined:
    May 26, 2010
    My front wheel is from an apprillia pegaso,not sure what disc will bolt straight on a Norton wheel tho?,I have a milling table on my lathe for making brake caliper mounts and such
     
  9. BrianG

    BrianG

    Joined:
    Sep 4, 2009
    Luckily, I have some equipment, too. I'd just like a decent starting point. LOL


    [​IMG]
     
  10. baz

    baz VIP MEMBER

    Joined:
    May 26, 2010
    Looks like you got it covered there, cheers
     
  11. Frankie17

    Frankie17

    Joined:
    Feb 11, 2015
    Replacement seals / repair kits / anodised alloy pistons are available for the copy AP race caliper so there should be no issues if you need spares
     
  12. BrianG

    BrianG

    Joined:
    Sep 4, 2009
    So, the available 320mm brake rotor questions persist:

    1. Is there one that will simply bolt up to the Norton hub?
    2. Is there one that only requires re-drilling the rotor bolt holes?
    3. Is there one that is the correct off-set but will require re-drilling the rotor bolt holes and some machine attention to the hub center hole size?

    Make/Model/Year would be appreciated.

    Cheers!
     
  13. acotrel

    acotrel

    Joined:
    Jun 30, 2012
    Two high speed steel discs with AP callipers using asbestos pads, is enough for anyone. A single chrome plated disc with one AP calliper using asbestos pads, is not enough. You can only go as fast as you can stop. Better to buy a second-hand Japanese hub which will carry common discs and change the bearings if necessary, than play with a Norton hub. Re-drilling the disc mounting holes is silly stuff.
     
  14. madass140

    madass140 VIP MEMBER

    Joined:
    Nov 6, 2011
  15. gortnipper

    gortnipper VIP MEMBER

    Joined:
    Nov 11, 2013
    https://www.accessnorton.com/NortonCommando/front-brake-caliper-conversion.285/

    https://www.accessnorton.com/NortonCommando/front-disc-brake-rotor-measurement-needed.14718/

    Suzuki GSXR front disk, Suzuki RG500 Caliper.
    Drilled the Suzuki rotor to fit the Norton hole pattern. The aluminum cover centers the rotor on the hub and covers the original holes.
    Caliper is from the right front of a 86 RG500, it was small enough to fit without modifying the fender bracket.
    Gnolan made both the centering cover and caliper bracket.

    http://www.accessnorton.com/NortonCommando/850-mkiia-mild-rebuild.8562/

    [​IMG]
    [​IMG]
     
  16. BrianG

    BrianG

    Joined:
    Sep 4, 2009
    Modern brake rotors are stainless steel, to avoid that ugly rusty look of the old cast iron rotors, as well avoiding rust contamination of the caliper pads.
    Also, I think asbestos isn't a modern caliper pad material.

    I don't understand your aversion to drilling rotor bolt holes, however. One can actually buy blank (undrilled) rotors from some manufacturers. With the right equipment, drilling the right hole in the right place is a simple operation.
     
  17. BrianG

    BrianG

    Joined:
    Sep 4, 2009
    OK, what is the source for this nice looking piece of kit?


    If it locates the braking surface anywhere near the OEM position, I can locate a Brembo, Nissin or Tokico, 2 or 4 pot caliper with a one-of adapter bracket.
     
  18. madass140

    madass140 VIP MEMBER

    Joined:
    Nov 6, 2011
    no it doesnt sorry. the standard disc is 18.5mm from the mounting face to center of disc, mine is 13.5mm.
    so my disc is 5mm further inboard.
     
  19. BrianG

    BrianG

    Joined:
    Sep 4, 2009
    That is likely near enough, as long as there is clearance from the spokes to the caliper.

    1. What caliper do you use with this rotor ?
    2. Can you provide the adapter ?
    3. How do I acquire this rotor?
    4. Can the center be silver/grey rather than gold?
     
  20. madass140

    madass140 VIP MEMBER

    Joined:
    Nov 6, 2011
    this is my pre MK3 brake kit Tokico 6 piston caliper and bracket, kit comes with mastercylinder which accepts the Lucas switchblock and brake light wires, hose, fittings , lower fender stay. EVERYTHING is supplied to convert from stock.
    cant change the center color sorry. purchasing from me directly $450 + shipping
    silver, gold or black caliper.
     

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