801 320mm brake discs

I changed my rotors to 320mm and there was a difference. The bigger difference was when I swapped on some Brembo calipers I had laying around from a Ducati monster. I’m sure if I did sintered pads it would be even bigger but it’s 2 finger braking with whatever pads were stock on a monster.
 
Actionabe said:
I changed my rotors to 320mm and there was a difference. The bigger difference was when I swapped on some Brembo calipers I had laying around from a Ducati monster. I’m sure if I did sintered pads it would be even bigger but it’s 2 finger braking with whatever pads were stock on a monster.
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If I remember correctly, you changed the discs to some stock 1290 KTM/Galfer 320mm discs.
I read somewhere that the stock KTM/Galfer brake discs are all produced on a separate production line and aren't of particularly good quality.
The aftermarket Galfer discs, on the other hand, are apparently of much higher quality; comparable to the aftermarket Brembo discs.
That might be a reason why the brake calipers made a bigger difference for you.

A few years ago, I also replaced some original brake discs on another bike with a pair of Brembo Oro discs and Brembo sintered pads; although the Brembo discs were identical in size to the originals, the difference was nonetheless very significant.

Those are just some experiences I’ve had; others, however, may have had different experiences...
 
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Yeah they are 1290 rotors. I am running stock dual 701 galfer discs on my 701’s mag wheel set up. They work great but do seem to be noisier than normal. They feel a lot different than the 1290s..
 
I am not skilled enough, but ... if I use for example Brembo M4.32, these calipers are same dimensions and same diameter of brake cylinders (pistons) as the original JJ. So they would brake "the same", no? Or? Where should the better braking come from??
If I will fit some M50, it will have bigger diameter of the cylinders, which means, that there will much longer lever movement on the master pump, no? But brake better, this is clear.

I was surprised, that 300=>320 discs will make just 6,7% difference of stopping power ... due to my mathematics :-D
 
animals21 said:
I am not skilled enough, but ... if I use for example Brembo M4.32, these calipers are same dimensions and same diameter of brake cylinders (pistons) as the original JJ. So they would brake "the same", no? Or? Where should the better braking come from??
If I will fit some M50, it will have bigger diameter of the cylinders, which means, that there will much longer lever movement on the master pump, no? But brake better, this is clear.

I was surprised, that 300=>320 discs will make just 6,7% difference of stopping power ... due to my mathematics :-D
Click to expand...

6.7% is the difference between breaking on time ore not, hehehe.

I am not skilled neither but I guess the Brembo M4 will be more rigid therefore loosing less power and you will probably feel it in the initial bite. I guess they will also handle better the heating when breaking hard.

For me the original JJs are good enough for street but I do not like the initial bite, it is too progressive. Perhaps changing the master cylinder will have more direct impact in braking power.
 
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