801 320mm brake discs

Holy hell!!

Edit: Just ordered the Brembo rotors. I like the look of the Galfer better but if it is metallurgy that is causing the warping issue I don't want to find out that the larger rotors will wind up with the same problem, I'm just now starting to feel pulsing right before I stop.
 
toast449 said:
Holy hell!!

Edit: Just ordered the Brembo rotors. I like the look of the Galfer better but if it is metallurgy that is causing the warping issue I don't want to find out that the larger rotors will wind up with the same problem, I'm just now starting to feel pulsing right before I stop.
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From what I've read it's mainly the material of the stock/OEM Galfer discs that causes the problem; the quality of the after market Galfer discs seems to be better.

But it's not just the warping; a webfind; some pics of some stock/OEM 890-R Galfer discs; I've never seen something similar at any bike...

source

1691189564354.webp 1691189591317.webp 1691262989141.webp 1691691934609.webp IMG_5231.webp IMG_5234.webp
 
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That amount of corrosion is insane. Looks like a flood damaged bike but just the rotors.

My main complaint about the 801 stock and 790 stock rotors is that they are so ridiculously heavy. There is no need for a 1/4” steel plate rotor carrier.
 
@Actionabe those pics are of two different bikes; no flood damage is mentioned just some rides near a seaside with one of those bikes...
 
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Tom said:
(y) Did you also order the sintered pads? From my experience the combination works very good!

www.genialmotor.it

Front Brembo Sa Brake Pads for Ktm DUKE 790, 2018 - 2020 | 07BB19SA

07BB19SA, front brembo sa brake pads for ktm duke 790 2018 - 2020, {product_category} for motorcycles to improve braking performance and safety, Spare Parts and Accessories by Brembo, Buy Now!
www.genialmotor.it www.genialmotor.it
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I did not and I didn't see your comment until it was too late to add to that order. $50 from italy for a pair vs $120 in the US. But I saved so much on the rotors I didn't care and just ordered them from amazon.
 
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a_muz_ed said:
I don’t now for sure, but maybe in road mode the abs also tracks the relative speed of the front and rear wheel. So if the front wheel slows down faster compared to rhe rear wheel, the abs already starts to intervene. In supermoto mode, the front brake is not influenced by the rear, and you can ride more on the limit of the front tire when going heavy on the front brake.

At least that’s how I experience it on the road when braking strong on the front and not using the rear brake.
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Grek706 said:
Hi, I want to build the same setup, could you please specify the dimensions of the spacers and the material?"
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Yes, of course, no problem.
Outer diameter: 20 mm
Inner diameter: 10.2 mm
Height: 10 mm
Material: 6061 Aluminum; but other alloys can also be used.
 
toast449 said:
Do you have Amazon where you are? In the US I ordered a 5 pack of these spacers for $6 USD, basically nothing.
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Damn... as I couldn't find any caliper spacers with the exact dimensions, I had them custom made...
I’ve just taken a look on Amazon Germany as well. They are available there too as universal aluminum spacers with virtually identical dimensions (inner diameter 10.5mm instead of 10.2mm; which is also perfectly fine); and even black anodized!

Bildschirmfoto 2026-07-27 um 15.55.27.jpg

Bildschirmfoto 2026-07-27 um 16.20.15.jpg
 
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I just happened to look as I was chucking up a piece of 20mm aluminum bar stock in the lathe to make my own. The bar stock would have cost almost as much as I paid for them from Amazon.
 
drt67 said:
Same for me. I will let my bike in the shop during my holidays in 2 weeks. I hope they will fix it under warrenty
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I picked up my bike last week from the shop. They changed both brake discs under warrenty as they were wrapped. The feeling is normal now and I feel the braking is hard enough without upgrading it. No change for me at the moment
 
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