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Old 02-05-2014, 10:17 PM   #1
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Default 1.8 (non sport) rear 2 piece rotors?

I have searched and searched. I wanted to get some made several months ago and got sidetracked. Now I would like to revisit this if anyone has a lead or ideas?
looking for stock 1.8(non sport) 2 piece rotors. at least for the rear
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Old 02-05-2014, 11:47 PM   #2
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Purpose? Less weight?
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Old 02-06-2014, 12:28 AM   #3
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precisely
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Old 02-06-2014, 09:40 AM   #4
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They'll have to be custom. The smallest 2 piece rotor that I can get off the shelf is 10.75. Trackspeed was supposed to be coming out with a 2 piece stock size kit. You can get a 2 piece kit in 10.75 made for you by fastbrakes though, I was quoted $975 per axle using wilwood powerlite calipers, which is a pretty killer price. So it'll probably be around $600 per axle for a kit that uses stock calipers.
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Old 02-06-2014, 10:04 PM   #5
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I have them. A little pricey, since they were never put into production, but a set does exist and I can make more. A little more than half a pound lighter than a factory 1.8L rotor. PM me for details.
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Old 02-07-2014, 09:01 AM   #6
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You have to know the specs for the custom job, but you probably won't find a better price than Coleman racing.
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Old 02-07-2014, 04:30 PM   #7
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The rings are easy. The hats are not. We have both
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Old 02-07-2014, 11:16 PM   #8
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Not sure why you would be hell bent on the non-sport rotors. But here are a set of two piece sport rotors for $483.00 for the PAIR

Two-piece rotor (Slot) - MIATA MX5 (SPORT) REAR 01-05

and then just buy a set of the M-Tuned brackets for $130 and be done with it. Cheap, light and effective.
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Old 02-08-2014, 01:34 AM   #9
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Quote:
Originally Posted by TNTUBA View Post
Not sure why you would be hell bent on the non-sport rotors. But here are a set of two piece sport rotors for $483.00 for the PAIR

Two-piece rotor (Slot) - MIATA MX5 (SPORT) REAR 01-05

and then just buy a set of the M-Tuned brackets for $130 and be done with it. Cheap, light and effective.
Rules.
Its prob not worth it for a half a pound anyways
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Old 02-08-2014, 02:41 AM   #10
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Quote:
Originally Posted by TNTUBA View Post
Not sure why you would be hell bent on the non-sport rotors. But here are a set of two piece sport rotors for $483.00 for the PAIR

Two-piece rotor (Slot) - MIATA MX5 (SPORT) REAR 01-05
Racing Brake rotors are utter trash.
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Old 02-08-2014, 07:45 PM   #11
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That's not been my experience.
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Old 02-08-2014, 08:18 PM   #12
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Sav seems more into track and you look like a real hardcore auto-xer. Different perspective I guess.
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Old 02-08-2014, 08:26 PM   #13
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Possibly. Either way I wouldn't call them utter trash. I know of one guy who NDI'ed a set and found them to be superior to Stoptech parts......just saying.

And i have read TONS of positive reviews from guys running running them on road courses.....in much heaver cars than a Miata.
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Old 02-09-2014, 10:41 PM   #14
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They are made of shitty steel (not iron like a metal brake rotor should be) and they will destroy pads and thermal crack long, long before even the cheapest NAPA blank does. BTDT. Racing Brake blames it on the pad manufacturers, of course.
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Old 02-10-2014, 01:16 AM   #15
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Quote:
Originally Posted by TNTUBA View Post
Possibly. Either way I wouldn't call them utter trash. I know of one guy who NDI'ed a set and found them to be superior to Stoptech parts......just saying.

And i have read TONS of positive reviews from guys running running them on road courses.....in much heaver cars than a Miata.
If you seriously track them rather than autocross only you will find them to be trash. Not only are the slots horrible for pad wear and performance the material is garbage compared to cast Iron found in other rotors and it doesn't interact right with pads that work well on tracks.
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Old 02-10-2014, 02:11 AM   #16
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I've never used RB rotors - but their pads are utter trash.

It seems they've since changed their lineup, but years ago - they recommended me some pads that ended up crumbling and delaminating after a 15 minute session. They sent me a set of ET900's which they claimed would be the greatest thing I'll ever use with ungodly amounts of stopping power. They were lackluster and didn't last the day. Never bought another set nor will I try their rotors due to how terrible the pads were.

*disclaimer* this was on an evo X, but I had used carbotech and pfc on that car with no problems.
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Old 02-10-2014, 02:46 AM   #17
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With some internet searching As near as I can tell OEM non sport rear rotors have hats with an offset of 20mm and a 9mm thick disk 251mm in diameter. The hats that come with the wildwood version front big brake have an offset of 0.75”. A machine shop wouldn’t have a problem skimming off 0.95mm so.
From www.Summitracing.com
Wilwood 170-11682 hats $124.93 each
Wilwood 300-11653 Adapter Rotor/Hat Register Ring,2.17" Dia $13.82 each
Wilwood 230-12176 12 bolt kit hat to rotor $15.96
Custom made solid disc rotors from Home Page 6 on 6.25 need a drawing made it will require a step for fastener clearance $92.85 ea
Brake Rotor, 1/4 / 1/2, Custom, Solid Mount

So for ~$480 plus shipping and a few dollars at a machine shop you can make your own rear two peace rotor set.

Last edited by bbundy; 02-10-2014 at 02:20 PM.
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Old 02-10-2014, 02:52 AM   #18
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interesting the sport rotor I think has a slightly smaller offset 18.4mm and its thicker 10mm instead of 9 and a diameter of 275.5. off the shelf wildwood hat would need to be shaved a bit more to make a sport brake version.
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Old 02-10-2014, 02:59 AM   #19
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Coleman racing cast iron seems to be as good as it gets for rotor material. Less cracking than anything I have abused and friction characteristics with aggressive pad compounds is excellent.
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