Hi,

I reached out to our UK vendor on brake rotors and they quoted a full 380/376 set of 2 piece rotors for 2550 British pounds shipped if 5 people bought sets. I only asked for the fronts. So, I suspect they don't have any spares in stock and that works out to about $3450 US - just rotors. That did not include VAT if applicable or shipping.

Well stock fronts would save about 7.5kg and rears about 2.5ky if you have 376mm in the rear per our original vendor's emailed data....far less if you have 325's (the stock rear's at 325 are only 9 lbs....

On my prior car I ran Girodisc two piece rotors. No noise. No issues. And a lot less costly than our UK option. As I live in the US, shipping was actually 'free" too.
So I called them and they picked up immediately and we chatted.
It makes the most sense to just do fronts as we mostly have 380mm rotors. Our rotors have a huge swept area of 79mm. Big Brembo kits are per the person on phone about 52mm...and my prior 6pot Brembos were 62mm...so 79 mm is gigantic. Otherwise the 380mm and width issues were not in any way odd for them. Stock rotors are 36.6 or so pounds. These might save us about 14 lbs (no way to know if as much weight will be saved...Girodisc does not drill rotors.....after doing a lot of track with drilled rotors in the past I prefer not having drilled rotors to be honest. Girodisc will slot the rotors however. But, I suspect it may be possible to not slot them too. Drill holes look great but seeing small cracks from track days at the holes ruins one's day. Trust me.

If we can get 5 total people interested we can get 380mm front rotor sets (2 rotors, complete hat/ring/hardware assembled) for $1500 to 1600 (US dollars) each complete set. New rings and hardware would then be about 900 dollars each set (their standard 380mm price...). Girodisc rotors are very common on tracks across the US and they have amazing customer service.

For more information on Girodisc go to https://www.girodisc.com/ .

I have no financial or other connection to Girodisc except that I have used them in the past and been impressed. No issues with them at all in several years of use. The wore well but I was not on track pushing them to he fair. They have the reputation of lasting a long time all other things being equal. Lots of people at PCA events used them too on their track cars.

Anyway, I'd love to get a set... that would be great.



1. jcb-memphis
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(he might be able to help us at less than 5....I asked about 3 and he was sort of sounding ok with that too......but who knows, - he wanted 5)

 

14 lbs each rotor, complete 28 Pfund less round about?
My OEM Rotor 380mm weight is 38,5 lbs each Rotor not 36,6lbs
BR
Andi

 

Brembo OEM one pieces are 36.6..so about 2 lbs lighter I guess than OEM for whatever reason....was using the Brembo number.

Am not sure what the final weight savings would be on the final Girodisc two piece rotor. They have not made one yet. The hat is aluminum and on my prior car that saved a lot of weight.

They key with the OEM Jaguar rotors is the huge swept area...79mm per the Girodisc engineer was really huge. Jaguar put in amazing brakes on these cars.

The UK vendor said they save 7.5 kg per front 380 mm rotor. So even if the Girodisc rotors save 6 kg....that is a lot. My guess is all the drilling is not more than 0.5 kg more...so the Girodiscs are likely to be close. But that is a pure guess on my part.

jcb

 

The Brembo 380mm Rotor is 17.7KG = 39 lbs
The OEM brake system is Excellent. I wouldn't waste money changing it out for anything else. There is no alternative that matches the quality and stopping power of the OEM system other than the Brembo BBK 400mm 6 piston front kit. That will run you $4600 usd. Is it worth it... probably not.

 

We agree. This thread is about lowering the weight of the rotors (oem) that weigh a lot.....cutting out 15lbs or so per corner using the OEM calipers....same system. Just new rotors.

 

If the weight savings are truly 10-15lbs per corner... keep me posted ill be the 5th person to sign up. Thanks

 

Why should one save significantly more weight than with the Brembo discs? And so much more, technically not possible with steel discs from my point of view!

 

Hats are aluminum....I am quoting the weight savings noted on an email to me from a vendor who did a group buy to some on this forum. On my prior car, I saved 7 lbs per front but with smaller rotors. The OEM rotors hare huge.... I would say expect 10 lbs savings....the 7.5 kg quoted by the other vendor would be great but they drill the heck out of their rotors and I am one of those track nuts who doesn't trust drilling (even though it looks super cool).

Here is the prior thread.

 

Wortec did a batch of 380/376 two-piece rotors a few years ago, but I think they stopped doing them. Try searching the forum for more info.

 

I tried them and they wanted for 5 to buy to make it possible and quoted about 3500 for the 380/376 4 rotor kit. I asked for just fronts and have yet to get a reply back.

What I do know is that Girodisc would likely do things in a way to let people get them going forward hopefully more affordably. Like once the first 5 were done to cover R and D then people could be able to by them as needed without a group of 5. It was sort of disheartening to need five again when just a little bit ago they did a 5 way group buy. One wonders about spare part costs and availability. That really matters to me.

 

I think that was the hope for Wortec, but didn't pan out. I just replaced my rotors (OEM), so I won't need them for a while, and I have the 326 rear ("High performance brakes"). But I'd be interested in a few years...

 

The brochure for my 2022 base 5.0L P450 RWD shows the car comes stock with 380mm fronts and 376mm rears.