[Shotimes] Rear rotor size

[Donald Mallinson]

Gen II was solid, but it was the same size (OD)as the Gen I 
vented rotor in rear.

Don Mallinson

Dave wrote:
> You know what I'm thinking of is the GEN I rotors 10.9 up front and out 
> back. GENII would be 10.1 in the rear and 10.9 up front. I sometimes 
> forget about the GENII's switching over to that junk solid rotor.
> Dave
> 
> Jon Heese wrote:
> 
> 
>>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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