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04-13-2021, 01:07 PM | #1 |
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Stoptech messed up big time with their wide annulus rotor
TL;DR - there is no proper sized race pad for the wide annulus (62mm) rotor from the new Stoptech trophy kit.
I ordered a gen5 Stoptech Trophy kit (STR60) from Buybrakes in Dec 2020. After a long wait, I finally received them in early April. During my search for a track pad to go along with this kit, Adam from Buybrakes told me that the kit comes with wide annulus rotor with a friction ring width of 62mm. While knowing using narrower pad on the wide rotor is okay, I still want to use properly-matched/sized pad. so based on the recommendation from the retailer, I went with Stoptech SR33 wide annulus version, part #333.8W11.18.0 (notice - this is not the regular SR33 for ST60 which has a part #333.8011.18.0). But after installing everything, I found out the alleged wide pad is still much narrower than the wide annulus rotor - there is a ~10mm gap between the inner edge of the pad and the rotor hat. See pic below: View post on imgur.com So Adam from buybrake passed this issue to Stoptech. And we just received a response from Stoptech - "We do not carry a wide annulus race friction for the ST60. Okay to use the narrow annulus race version, higher effective radius for now. We are planning to swith the race versoins of the wide annulus systems to 380x35 normal annulus rotor." This is completely BS since the street pad that comes with the kit are wider pad at 61mm, as I measured View post on imgur.com but the alleged wider SR33 is only at 54mm View post on imgur.com So am I supposed to use two sets of pads of different sizes? this answer from ST is completed unacceptable. I think the only right option for me right now is to purchase another set of street pad with narrower width so that both street and race pads have same sweeping area....Should've spent a little more $$ and go for AP... Last edited by jim1013yyf; 04-13-2021 at 01:23 PM.. |
04-13-2021, 06:43 PM | #2 | |
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04-13-2021, 09:38 PM | #4 |
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https://www.hawkperformance.com/part...perSize=338868
Looks like Hawk doesn't make the wide annulus version of the pad. |
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04-13-2021, 11:32 PM | #5 |
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Check with Porterfield Brakes in Costa Mesa, CA. If you have the shape, they will make pads for you using your choice of friction material. We went this route on our 2013 F30 335 before track pads were available for the M Performance brakes.
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04-14-2021, 09:04 AM | #6 |
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Adding to the post above. I had Carbotech XP20 pads made for my OEM ceramic calipers on Girodisc Iron Rotors, and they were AMAZING - IMO better than the PFC 08s i had on another track car.
Do note, they squeal a fair bit, and dust a lot (dust was easy to clean). I went through Ken at KNS Brakes and he was great! |
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04-14-2021, 11:41 AM | #7 | |
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04-14-2021, 11:42 AM | #8 | |
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Good to know that! Will reach out to see if Stoptech cannot resolve this problem. Is there a tailoring fee? |
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04-14-2021, 11:44 AM | #9 | |
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04-15-2021, 03:29 PM | #11 | |
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I sent them the following and hopefully they call me back with a response:
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04-15-2021, 06:40 PM | #12 |
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So a data point. I have swapped back to the regular wide street pads, and the the brakes felt like shit. This is mainly because the Hawk race pads really shaved the rotor and the street pad were not quite flush. After driving for a bit things became better. I assume this is because the the street wide pad got deformed to fit the new shape of the rotor. I probably need to take the car to a local back road to bed in the pad again. The main take away is that if you swap from standard race pad to a wide street pad, the brakes will feel like shit because the pad can't make good contact with the rotor. From a safety stand point, it is better to just run same sized race and street pads.
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04-16-2021, 12:51 PM | #13 | ||||
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Quote from Adam "I have the owner here digging in with the VP at Stoptech, fyi....not sure when but they're going to discuss any potential solution for the WA rotor/pad issue" |
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04-19-2021, 10:11 PM | #14 | |||||
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04-19-2021, 10:59 PM | #15 | |
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04-19-2021, 11:08 PM | #16 | |
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I "DM"ed you. I was bitching to Adam about this, but then I got side tracked with a bunch of work and kid stuff... Edit: If StopTech can make a wide pad with a Hawk DTC70 like compound, that would be freaking awesome. |
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09-13-2021, 07:42 PM | #18 | |
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Do you have the Stoptech FMSI # for their pad shapes (f/r)? You can take those FMSI #s to a brake pad manufacturer and they can accommodate you.
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09-23-2021, 11:30 AM | #19 |
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yes according to stoptech and the vendor, the new FMSI# for the wide-annulus rotor is DR35 (instead of the DR11). But the problem came as I was double checking the size of DR35, and found out that it was 54mm.... so there is no actual FMSI# for the 62mm pad that they sent out with the kit.. at least they are not posted anywhere.
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09-23-2021, 03:56 PM | #20 | |
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11-09-2021, 12:32 PM | #21 |
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https://knsbrakes.com/c/caliper-seri...P20+Brake+Pads
This is the pad to get. I didn't have a chance to test it out, but I heard from another member that it worked great at Laguna. |
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