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Author Topic: difference between 7012 and 7012R rotors for 69-71  (Read 2548 times)

fury fan

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difference between 7012 and 7012R rotors for 69-71
« on: July 28, 2008, 04:41:22 AM »

Based on info I have read, the 7012 is the rotor for a 69-71 brake setup (the expensive style).
 
However:

  • Rock Auto shows a 7012R rotor for $152 and a 7012 for $132.  The R’s application is specifically listed as 69-72 C-body, while the plain 7012 has no applications listed.  
  • Partsamerica.com shows the 7012 as being the correct part# for a 69-71 rotor and does not recognize a 7012R.
  • Autozone.com has no listings for 69-71 at all.

 
So:
  • I wondered if the R refers to RH threads, but if so I would think the R rotor would be cheaper due to the studs being more ‘common’ for the manufacturer. 
  • There is no listing for brake rotors for 69-70 cars (on Rock Auto), 71 is the earliest year showing a rotor, and wasn’t 71 the start of RH threads on both sides of the car? 
  • The photos look the same, but I’m not sure we can trust that in this case.
  • Both are listed as ‘professional grade’, so no clues there.
  • Haven’t found a ‘related parts’ link so I can’t cross-ref by the bearings to figure out what’s –what.
Any thoughts?  I have heard of (and seen) a unicast 69-72 rotor, perhaps the 7012 is it???
If the 7012 is correct I’d sure like to be able to save $40 on a pair of rotors!
 
Here is a kinda-related link on rotors, although it doesn’t address my question.
http://www.moparfins.com/forum/forum_posts.asp?TID=616
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65 300L (former California car, solid but needs cosmetics)
65 Sport Fury project (orig 4spd car)
68 Fury III 2dr (440 transplant)

Steve

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difference between 7012 and 7012R rotors for 69-71
« Reply #1 on: July 28, 2008, 08:29:01 AM »

Take a look at one of the disc makers.  Try Rayobestos.
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fury fan

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difference between 7012 and 7012R rotors for 69-71
« Reply #2 on: July 28, 2008, 09:13:22 AM »

Just looked at Raybestos's website and they show both the 7012 and 7018 (the '73 rotor) as fitting a 71.  I have found numerous websites with this error on it!   
 
Anyway, Ray's shows the 7012 and 7012R  as fitting 1971, and it shows the R as 'professional grade' and the other one as 'PG plus'.  They do not provide any extra details on the 7012R, and I did not see anything describing the marketing/engineering differences between the 2 grades.
 
Anyway, it looks like they interchange and I'm now poised to save $40 on rotors, which is a good thing.  But compared to the '73 rotors, it's kinda like a 'good' day in the stock market - you don't come out ahead, you just lose a little less than the day before...
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65 300L (former California car, solid but needs cosmetics)
65 Sport Fury project (orig 4spd car)
68 Fury III 2dr (440 transplant)

Steve

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difference between 7012 and 7012R rotors for 69-71
« Reply #3 on: July 28, 2008, 10:52:11 AM »

Oh well. . .It was a thought.  I don't know what professional grade means either.
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Arlen Vander Hoff

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difference between 7012 and 7012R rotors for 69-71
« Reply #4 on: July 28, 2008, 12:23:33 PM »

Isn't Professional grade like for Cop cars and Taxi cabs???? Just a thought.
Maybe they are thicker or 15.5 inches or something. My .02
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Steve

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difference between 7012 and 7012R rotors for 69-71
« Reply #5 on: July 28, 2008, 02:04:00 PM »

Arlen has a point.  Maybe they are vented somehow
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Matt Aker

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difference between 7012 and 7012R rotors for 69-71
« Reply #6 on: July 28, 2008, 02:27:31 PM »

The only difference I ever saw with the Chinese rotors/drums versus the better (professional grade) was the quality of the steel.  This is from BOTH my CarQuest and NAPA dayz.  Sadly almost all of the current offerings come from overseas, the Chinese need to eat and feed their families too...
 
The last domestic (if memory serves) manufacturer of replacement drums and rotors (Erie, PA) went bankrupt due to the rising price of virgin steel and the lower cost of the recycled steel imported products.  This happened when I werked for CarQuest.  CQ consolidated all of their rotors/drums into a common product line and reduced the warranty to 60-days on ALL of them
 
I wish I could be of more help here.  I just don't have the parts books to look at anymore...
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Rich

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difference between 7012 and 7012R rotors for 69-71
« Reply #7 on: October 09, 2008, 09:46:50 PM »

The R is usually meant to indicate RIGHT hand threaded studs. Be careful not to mix up the rotors between the expensive two piece 7012 and the cheaper one piece 7018.  A lot of the parts stores show that they can both be used on the early disc brake cars, but the 7018 rotor is only compatible with 73' spindles. The difference is in the size of the wheel bearings - the 7018 rotors use the larger A16/A17 bearings. krautmaster2008-10-10 02:48:43
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zhuo1005

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difference between 7012 and 7012R rotors for 69-71
« Reply #8 on: March 07, 2012, 08:28:23 PM »

Take a look at one of the disc makers.  Try Rayobestos.

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