[Shotimes] Rear rotor size

[Jon Heese]

Yeah, I'm gonna have to go with Paul on this one.  I measured half 
(estimated) of the circumference of my rear rotors (since the calipers 
got in the way of a full circle) at 16", meaning C = 32", d = C/pi, d = 
~10.1".  On a related note, I was under the impression that the stock 
front rotors (on a '95) were 10.5" in diameter, but after measuring the 
ones I took off last week at 34.5" circumference, that puts their 
diameter (using the same forumla and value for pi) at ~10.9".  Maybe 
that's what you were thinking of, Dave?

  - Jon

Dave wrote:
> 10.9 inches for the rear rotor.
> Dave
> 
> Jon Heese wrote:
> 
> 
>>Jason,
>>
>>For what it's worth, my '95 GL came from the factory with 4-wheel 
>>discs and I've seen a couple more in salvage yards with such.  So it 
>>was offered as an option on SLOs.
>>
>>I appreciate the effort, but in my search for this number, I already 
>>came across all of the same stuff you did. =)  I guess I'll just go 
>>outside later and measure the circumference of the disc to get an 
>>accurate diameter number.  If anyone's interested, I'll post it to the 
>>list.
>>
>> - Jon
>>
>>Hartberger, Jason M. AT3 wrote:
>>
>>
>>>I can't quote you exactly (making me pretty much useless for the 
>>>question
>>>asked), but I do know that the only difference in SHOs was vented 
>>>rear disks
>>>(vice solid ones later) in the 89-91(92?). I think. I'm not actually 
>>>sure
>>>about the rears... I do know that the SLOs used drums in the back, so 
>>>that's
>>>a whole other ballpark. I just looked on AlldataDIY, and it gives a part
>>>number of YF1Z2C026BA for the rear disks on a 94. Autozone lists the 
>>>same
>>>(different) part number for a rear rotor - 54025 - for both a 93 and 
>>>a 94,
>>>suggesting no change between those two years. AZ lists a part number 
>>>of 5495
>>>for a '90, and also a 92, meaning they changed from the vented to the 
>>>solid
>>>rotor in 93. still don't know the OD of these things, though, but you 
>>>can go
>>>to an AZ or AAP and ask for one with a ruler and measure it there... 
>>>the 94
>>>rotor has a min. thickness of .5", if it helps.
>>>
>>>There might have been some rear disked SLOs out there. I don't know 
>>>of any,
>>>but I'd assume it'd be the same disk as the SHO... commonality and 
>>>all that.
>>>
>>>I doubt it helps a whole lot, but I hope it helps a little.
>>>
>>>Jason
>>>
>>>
>>>-----Original Message-----
>>>From: Jon Heese [mailto:shotimes@jonheese.com]
>>>Sent: Monday, January 10, 2005 1:25 AM
>>>To: shotimes@autox.team.net
>>>Subject: [Shotimes] Rear rotor size
>>>
>>>
>>>Out of curiosity, what's the diameter of the Gen2 factory rear 
>>>rotors? I looked through my year or so of list archives and googled 
>>>the crap out of it, but no one explicitly quotes a diameter 
>>>measurement for the rotors.  I suppose I could go outside with a lug 
>>>wrench and a measuring tape, but I reckon someone can throw this out 
>>>off the top of their head.
>>>
>>>Also, I know the size of the front rotors changed a couple times 
>>>throughout the years, but did the size of the rears ever change?  Are 
>>>they the same rotors found on rear disc SLO's of the same vintage?
>>>
>>>TIA,
>>>Jon Heese
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>>
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