RGM 12" disc and OEM caliper ?? (2017)

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BrianG

BrianG

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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?
 
BrianG said:
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?
Click to expand...


The 12inch disc requires their adapter plate AND race type caliper (either expensive AP, or cheaper Grimeca).
 
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
RGM 12" disc and OEM caliper ?? (2017)

I have a spare adapter available, PM if interested.
 
Fast Eddie said:
The 12inch disc requires their adapter plate AND race type caliper (either expensive AP, or cheaper Grimeca).
Click to expand...
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!
 
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
 
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
 
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.
 
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
 
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
 
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!
 
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.
 
well here is my 320mm offering which bolts to the Norton hub, stainless carrier so the rivets dont flog out like the alloy ones. I made them to suit my brake system. I have no idea what other caliper setups could be adapted.
Removed broken link
 
Last edited by a moderator:
BrianG said:
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!
Click to expand...

Derek Wilson said:
Ron,
You might find a Suzuki GSXR rotor that would fit your needs. A guy in my area fitted one with out much trouble. They at least have 5 holes, apparently the offset is close as well. He used a six piston caliper off of a Kawi ZX-??. Haven't talked to him in a while, but that brake must be killer.

I have been toying with the GSXR idea for a while, but my brake works really good as is (squawk the tire with 2 fingers, moderate squeeze).

If you want something custom made, let me know. I have the Norton fork leg and associated hardware modelled in CAD, a new adapter plate would be a piece of cake.

Let me know off line: norton 8) golden.net

Regards,

Derek
Click to expand...

https://www.accessnorton.com/NortonCommando/front-brake-caliper-conversion.285/

jeffdavison said:
OK....... got parts fabricated and mounted. Fender still needs paint. I found the Suzuki rotor (19.5mm offset 300mm diameter and 5mm thick) and sourced the Galfer replacement for it (DF321CW). I found a surplus 2002 Indian rear disc caliper that just happened to be the correct 40mm spacing 30/34 Brembo caliper needed on eBay fo about $85 less than retail and I like the silver better as well. The disc rotor needed 3 parts to work; a 3mm spacer, a hub adapter (64mm outside dia. to 2.08 inside dia.) and a cover. Drilled 5 new holes on the Galfer disc carrier and with 5 ARP stainless 12pt. bolts, all went together perfectly. I had to relieve the inside of the right fork slider about 1/16" deep about an inch tall for some clearance for the disc floater rivets... easy enough with out comprimising the wall thickness of the slider too much. Clubman Racing supplied the caliper adapter, and I fabricated a short 10mm banjo to -3 AN female brake hose to mate with the existing SS hose.

JD

RGM 12" disc and OEM caliper ?? (2017)

RGM 12" disc and OEM caliper ?? (2017)
Click to expand...

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/

RGM 12" disc and OEM caliper ?? (2017)

RGM 12" disc and OEM caliper ?? (2017)
 
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acotrel said:
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.
Click to expand...

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.
 
madass140 said:
well here is my 320mm offering which bolts to the Norton hub, stainless carrier so the rivets dont flog out like the alloy ones. I made them to suit my brake system. I have no idea what other caliper setups could be adapted.
Removed broken link
Click to expand...

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.
 
Last edited by a moderator:
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.
 
madass140 said:
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.
Click to expand...
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?
 
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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