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#1 |
Registered User
Join Date: Dec 2005
Location: Kalifornia
Posts: 344
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Truck rallys and disc brakes problems
I know there are several posts about this subject, but here we go again. I have a set of 15x8 truck rallys with 4 inch backspacing. They will not mount over the original brake calipers. Truck is original and original ride height with no modifications. It's been stated this type of wheel is compatible with disc brakes as long as they aren't larger aftermarket calipers. I have a 72 C10 with disc front/drum rear. What gives? I haven't tried them on the rear drums, but if they won't fit the front they are useless to me. Bought these at a swap meet and a lesson learned. Any thoughts? (other than I'm screwed) Thanks
One thing I notice is a slight inward taper of the rim toward the hub. Normal? |
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#2 | |
Senior Member
![]() Join Date: Apr 2013
Location: Houston,Tx
Posts: 786
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Re: Truck rallys and disc brakes problems
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1966 C10 Mary 1972 C10 Cheyenne "Betty" https://67-72chevytrucks.com/vboard/...d.php?t=847364 1976 C35 Sierra Grande "Mr. Harvey" 1979 C10 Silverado "The BIG TEN" https://67-72chevytrucks.com/vboard/...d.php?t=841339 1982 C10 Silverado "Lucy" C10 Club Texas -HMIC |
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#3 |
Born Psycho
![]() Join Date: Feb 2001
Location: brentwood,cal,usa
Posts: 4,889
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are you sure they are truck rallys, factory truck rallys weren't available until a few years after disc brakes became standard equipment on all GM light duty trucks. post some pics so we can see where the problem is.
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jerry moss 72 cheyenne super K20- tilt,tach,vacuum,speedwarning,buckets,shoulder belts,am/fm,tow hooks,bumper guards,toolbox,aux. fuel tank,posi front and rear,plus other goodies!!! SOLD 69 suburban K20-tilt,tach,vacuum,speedwarning,buckets,shoulder belts,am/fm,4 inch all spring lift,4 speed, 14 bolt full floater, dana 44 HD,warn winch,posi front and rear,tow hooks,plus other goodies. 73/80 chevy/gmc K20 SB400,turbo 400,205,tilt,a-c,gas hog. 77 K/5 cheyenne blazer-daily driver/beater. SON HAS IT NOW BRENTWOOD,CALIFORNIA |
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#4 |
Registered User
Join Date: Dec 2005
Location: Kalifornia
Posts: 344
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Re: Truck rallys and disc brakes problems
Thanks. I'll send pics asap. Won't go through it says a security token missing. That's a new one.
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#5 |
Senior Member
![]() Join Date: Apr 2016
Location: Cypress, TX
Posts: 3,741
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Re: Truck rallys and disc brakes problems
I have encountered that and fixed it by reducing the picture size to 2000 pixels wide and add the pictures one at a time. You can still compose a post with 5 pictures, but just upload them one at a time.
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#6 |
Registered User
Join Date: Dec 2005
Location: Kalifornia
Posts: 344
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Re: Truck rallys and disc brakes problems
Thanks DJ. It worked.
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#7 |
Senior Member
![]() Join Date: Jun 2022
Location: San Ramon,CA
Posts: 514
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Re: Truck rallys and disc brakes problems
I have no insights to offer, but maybe slap some painter's tape on the inside of the rim to show you where it's rubbing(without marking the metal). Maybe a blobby weld, or something you can clean up.
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1970 C10 Custom longbed 350/350 |
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#8 |
Roadtrip!
![]() Join Date: Feb 2003
Location: Grand Rapids MN
Posts: 13,739
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Re: Truck rallys and disc brakes problems
They should fit without issue. Are they stamped 15x8jj or something similar? My only thought is maybe aftermarket but even those SHOULD fit.
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67 gmc custom lwb dakota truck. Sold...And bought back 69 swb 4x4 project (in progress) 70 c-10 lwb texas truck 70 4x4/BB/bkts/posi/tach(retired) 70 swb (wifes) 70 jimmy camper 71 K-5 factory 2wd 71 cheyenne 4x4/tach/posi/ plow rig 71 Cheyenne20 BB, buckets, tach, tilt, 4 speed 72 jimmy CST wyoming rig 72 jimmy Colorado rig 72 lifted texas 4x4 3/4 ton burb 65 fury conv. 383/auto 65 chrysler 300 "L" 413 auto |
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#9 |
Senior Member
![]() Join Date: Dec 1999
Location: Spring Valley, Ca.
Posts: 1,112
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Re: Truck rallys and disc brakes problems
Can't remember for sure. But when I went with the 115x8's on my '71 the issue wasn't with the calipers. But the problem was because of the dropped spindles that were interfering. Had to grind a small amount of material off to get the needed clearance. So take a look at this area instead of the calipers. It's been 20+ years ago, so can't remember exactly where the rub was. But in that era I think this was somewhat a problem often encountered. Best of luck.
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Smitty '71 Short Fleetside Spring Valley, Ca. |
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#10 | |
Registered User
Join Date: Dec 2005
Location: Kalifornia
Posts: 344
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Re: Truck rallys and disc brakes problems
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#11 |
Senior Member
![]() Join Date: Apr 2013
Location: Houston,Tx
Posts: 786
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Re: Truck rallys and disc brakes problems
Those look like regular rallys... the should fit with no issues … especially with stock suspension.
__________________
1966 C10 Mary 1972 C10 Cheyenne "Betty" https://67-72chevytrucks.com/vboard/...d.php?t=847364 1976 C35 Sierra Grande "Mr. Harvey" 1979 C10 Silverado "The BIG TEN" https://67-72chevytrucks.com/vboard/...d.php?t=841339 1982 C10 Silverado "Lucy" C10 Club Texas -HMIC |
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#12 |
Registered User
Join Date: Apr 2001
Location: DALLAS,TX
Posts: 21,983
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Re: Truck rallys and disc brakes problems
Post an image of the truck as well as one of the front suspension & spindle.
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67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... Cubic inches is like Indiana Jones with a cheap pistol. |
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#13 | ||
"I ain't nobody, dork."
Join Date: Sep 2007
Location: Whidbey Island, Washington
Posts: 8,945
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Re: Truck rallys and disc brakes problems
I had some raised areas on the casting line on the backs of the disc brake calipers on my '72. I had to take a grinder and smooth out the backs of the calipers for them to not rub on the 15x8 slot mags I used up front.
Gary
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'cuz chicks dig scars... My 1972 GMC 1500 Super Custom (Creeping Death) "long term" build thread. The Rebuild of Creeping Death after the wreck Quote:
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#14 |
Senior Member
![]() Join Date: May 2006
Location: Philadelphia, Pa. 19454
Posts: 9,527
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Re: Truck rallys and disc brakes problems
![]() If I couldn’t run my 6lug slotted steel wheels,I’d be hard pressed to choose something else No problem bolting them on with suspension or calipers, but it’s 4WD………
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Semper Fi...Uncle Sam, you da man All parts offered to help are free, unless otherwise noted Dont try this stuff in my build thread, unless you have 55 years of mechanical OTJ training SAFETY FIRST AS usual, off topic They say your mind goes second, can't remember the first Jim |
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#15 |
Registered User
Join Date: Apr 2001
Location: DALLAS,TX
Posts: 21,983
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Re: Truck rallys and disc brakes problems
6-lug car 'Rallys' are definitely aftermarket vs an OE 15x8" truck 'Rally'.
__________________
67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... Cubic inches is like Indiana Jones with a cheap pistol. |
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#16 | |
Registered User
Join Date: Dec 2005
Location: Kalifornia
Posts: 344
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Re: Truck rallys and disc brakes problems
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#17 |
Registered User
Join Date: Sep 2011
Location: Ark City, Kansas
Posts: 3,343
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Re: Truck rallys and disc brakes problems
Festus, if you rode a horse like everyone else, instead of that mule, you might not have these problems!!!!!!
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#18 |
Born Psycho
![]() Join Date: Feb 2001
Location: brentwood,cal,usa
Posts: 4,889
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__________________
jerry moss 72 cheyenne super K20- tilt,tach,vacuum,speedwarning,buckets,shoulder belts,am/fm,tow hooks,bumper guards,toolbox,aux. fuel tank,posi front and rear,plus other goodies!!! SOLD 69 suburban K20-tilt,tach,vacuum,speedwarning,buckets,shoulder belts,am/fm,4 inch all spring lift,4 speed, 14 bolt full floater, dana 44 HD,warn winch,posi front and rear,tow hooks,plus other goodies. 73/80 chevy/gmc K20 SB400,turbo 400,205,tilt,a-c,gas hog. 77 K/5 cheyenne blazer-daily driver/beater. SON HAS IT NOW BRENTWOOD,CALIFORNIA |
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