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12" C4's behind 15" Centerlines??? '69 Camaro

967 views 4 replies 2 participants last post by  jamesohoh7  
#1 ·
Yep, I still run -those- wheels! (Auto-Drags).. since 1986... call me old-fashioned
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They're 15x7 (fronts) and 15x8.5 (rears), 'neutral' offset (fronts are, I think 3 & 7/8 or near-abouts... my 'dead-eye' ain't so dead-on anymore).

I have scoured the web, scoured this site (well, until my eyes went all blurry anyway...) and dang if I can find anyone that has tried -this- combo.

Will it fit?.. talking fronts mostly, b/c I can't do all four corners at this time ($$-low).

I saw someone post somewhere that they put the 12" C4's on w/steel rallys?.. but, that's not exactly the same setup, so I gotta ask.

I found a template on Baer's site for a 12" setup (the PBR1 12.0 for 2nd-gen F-cars I think) that I printed out and it -seems- to fit as far as size goes... but!??

The Baer template seems to indicate that the cross-section of this setup has the fattest part of the caliper further to the rear of the wheel.

I made a full-width cardboard template and it does fit inside my wheel, and the bulk of the caliper actually hangs out of the wheel anyway... but since I used a template for the wrong year, will it matter?.. or is it sufficient to know that "A 12-inch rotor setup fits using PBR-style calipers"??

To me, they -LOOK- like the Vette PBR's (tarted up a bit with the 'Baer' logo), but from what I've read here, the jury is still out??

Anyway, if anyone has tried this same setup, please let me know if it works or not before I go spend $$. I'd have a baby chicken if I got all the parts (I'm just going to fab it all up like on the C4-brakes web-site b/c I can't afford the Baer kit) and they didn't fit my wheels.

Thanks,

-James

Oops.. forgot, I'm brand-new to this board, my car: (guess I'll add this to my 'signature')...
'69 Camaro, Hugger Orange, deluxe interior, big-block, th400 + 3.5K stall, 4:11 - 12-bolt... ALL DRUMS! (yikes!!) (nope, car ain't as nice as it sounds on paper :/ )
 
#2 ·
i might be the person you are thinking of with the PBR setup behind factory steel wheels- but they aren't rally's, they are 70's Z/28 wheels that are 15X7. they cleared with only a slight touch of an abrasive roll to a couple of points on the calipers. nothing major, but your aluminum wheels might be different.
I know have a set of 16X8 IROC wheels on there, and those have about 1/2" of clearance at the tightest point.
 
#3 ·
Hi Novaderrik,

Thanks for the info, yeah, I think it was your site I saw. Nice car, and I have always liked those IROC wheels.

Do you happen to have any measurements of your setup?... All I need to know is what's the distance from the fattest part of the caliper to the center of the hub, as it sits installed on the vehicle... or even run a tapemeasure across the rotor from top of caliper to opposite side, across the diameter.

Centerlines are forged (well, Auto-Drags are), so they're pretty thin-walled... if the fattest radius turns out to be under 7.25", I'm probably in good shape.

Actually, anyone that's done this swap that has done this measurement, please feel free to chime-in!
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I just need to know if I can trust the template I got for the 2nd-gen 12" setup from Baer to be an accurate reflection of a 1st-gen setup.

Thanks folks,

-James
 
#4 ·
"if" i think about it, i will pull a wheel off tomorrow and measure for you.
before i started gathering parts, i downloaded one of those Baer templates, and the tight parts were in about the same place as how it actually fit when it was all together. really, i only had to take about 1/8" off of the corners of the calipers for it to clear the 15" steel wheels, but my regular old 15" spare tire doesn't fit. close- but not quite. i still need to find a spare that fits- tried and Astro 16" spare, but no dice there. looking for a newer Z28 spare (the 1LE cars got an aluminum spare, or so i have read), but those are rare in the boneyards around here.