Brake Disc Info

[Cav]

I replaced my OEM discs a couple or 3 years back with Brembo Serie ORO discs and noticed they were a bit better. My mate with the S1000RR needs new discs badly and I did a bit of digging but haven't found anyone with personal experience of both the ORO and HPK.

Do any of you have experience of ORO and HPK discs? The HPK is supposed to be better, costs around £40 more and look very similar to the ORO. So far as I can tell they're the same materials and thicknesses too

[Kwacky]

I try to sell my bikes before the discs need replacing

[Cav]

Haha fair enough!

This bike's been on the track for 5000 of it's 6000 miles with OEM discs. It hasn't done a bad job dealing with 190+bhp & 18 stone of rider

[Rossgo]

Same as Kwacky I've never had to look for new discs before. But would be great if you update this thread - what did he decid, what does he think etc

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[Kwacky]

Are the discs the same weight?

[Cav]

Extremely similar, yes. Heavier than OEM due to being 1mm thicker

[Kwacky]

are the HPK and the ORO the same weight? Seems a bit odd to sell one for £40 more than the other if they're the same thing.

From what I can see the HPK are thicker than the ORO. ORO are supposed to be direct replacement for OEM but HPK are approved for superstock whereas the ORO are not.

[kiwikrasher]

are the HPK and the ORO the same weight? Seems a bit odd to sell one for £40 more than the other if they're the same thing.

From what I can see the HPK are thicker than the ORO. ORO are supposed to be direct replacement for OEM but HPK are approved for superstock whereas the ORO are not.

This pipped my interest so went for a bit of research.

Unfortunately I found it very hard to find any specific info on material types. The HPK state they use a martensite stainless but most modern bikes use SUS410 Stainless steel which is already a martensite stainless. But what I couldn’t find is if there is a physical difference in the metallurgy of the different discs.

What I did find are the main differences.

ORO - Direct OEM replacement so comes in fixed and floating depending on OEM fitment, 5mm thick, steel alloy hat for floating versions

HPK - 5.5mm thick (last longer, deal with thermal stresses better) aluminium alloy hat (so reduces weight, or in this case counters weight gain from thicker rotors.) Only floating variant and machined to closer tolerances with have been developed to be ‘bike specific’ especially in the area of the rivets which leads to greater torque transfer.

There was a line in one of the blurbs that said the HPK had higher coefficient of friction. Now that leads me to believe the material of the rotor is different or someone is just making stuff up.

[Cav]

The ORO and HPK are both 5.5mm thick from what I found and one blurb said the ORO has a higher carbon content than OEM.

I also saw that about the HPK being martenstitic but like you say, most stainless steels are in this application.

I didn't see that about the coefficient of friction, however. I might email Brembo direct

[kiwikrasher]

The ORO and HPK are both 5.5mm thick from what I found and one blurb said the ORO has a higher carbon content than OEM.

I also saw that about the HPK being martenstitic but like you say, most stainless steels are in this application.

I didn't see that about the coefficient of friction, however. I might email Brembo direct

Developed using Brembo’s unrivalled experience gained from the highest levels of racing, the Serie Oro (‘Gold-Series’) disc for your bike uses an upgraded 5mm thick (most OE discs are only 4 or 4.5 mm), High-Carbon Stainless Steel rotor mounted on a CNC machined Hard-Anodised Aluminium Alloy centre utilising Brembo floating bobbins.

Be good if you can get a tech spec sheet for both Cav

But from what I’ve read for the extra £40 I’d go the HPK for track use.

[Cav]

Brembo haven't gotten back to me.

I spoke to a Brembo distributor who says the ORO are the same thickness as stock and the HPK are thicker (5.5mm). This goes against everything I've researched so now I have no idea what to believe

[Deegee]

I can only assume the alloy is slightly different on the HPK, maybe better wear resistance or conductivity, and the added mass is better at absorbing the huge heat transfer on a track when you initially hit the brakes? Or is it a better race life on track, if it starts thicker, it’ll take longer to wear past it’s minimum thickness maybe?

[Cav]

So apparently the HPK is a lighter disc (not buying that) so I think he maybe means it's a lighter material with more carbon to increase friction, increasing braking ability. The thickness increases thermal dissipation thus they don't fade plus they also will last longer

[kiwikrasher]

I think I might offer myself to them as a tech writer, someone needs to do a better job in that regard!

[Kwacky]

The 5.0 and 5.5 mm is what I found out when I did a Google.

[kiwikrasher]

The 5.0 and 5.5 mm is what I found out when I did a Google.

Same here mate. The rest of the info is sparse and inconsistent in the blurbs between the different units. I guess not everyone wants to know the specifics of the metallurgy and the name itself is enough to keep sales moving

[Cav]

I think you're right, Kiwi... and maybe you should! #BigDollar