[Shotimes] Rear rotor size

[Dave]

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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