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#1 |
Registered User
Join Date: Aug 2013
Location: Gluckstadt, MS
Posts: 71
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Help with wheels after disc conversion
I have done searches and cant find what I am looking for. 1970 LWB GMC with original 15" wheels. Recently had all new MOOG suspension and CPP disc brakes/booster/mc/prop valve installed.
Wheels are in place, but had to add washers to clear calipers. Backspace of original wheel is about 3 7/8". Approx 1/2 inch of washers had to be added for clearance. Does that mean that I need to look for a wheel with roughly 4.5" backspace? I wanted to stay with stock look, but going to aftermarket aluminum, dont want to use a spacer. Pics meant to show space from rotor to back of rim and clearance from caliper to inside of rim. |
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#2 |
Senior Member
![]() Join Date: Dec 2013
Location: Gods country East,Tn
Posts: 8,545
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Re: Help with wheels after disc conversion
I sure hope your not driving it like that ? those wheels are destroyed .
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__________________
![]() 1967 Factory short bed - Old school '71 - 350 / 4bolt / 487 heads / Edelbrock C3BX Muncie M-22 4 speed / Hurst Comp plus Factory 12 bolt posi 3.73 / 255-70-15 Smoothed firewall / Factory cowl induction Power disc brakes / power steering / 3.5-5" drop |
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#3 |
Registered User
Join Date: Jul 2012
Location: Whitehorse yukon
Posts: 1,218
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Re: Help with wheels after disc conversion
Drum brake wheels do not fit with disc brakes
The inside area hits the caliper |
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#4 |
Registered User
Join Date: Dec 1999
Location: Austin, TX, USA
Posts: 7,717
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Re: Help with wheels after disc conversion
You kept it 6 lug? If so 71-87 6 lug 4x4 rims should work just fine.
__________________
44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax |
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#5 |
Registered User
Join Date: Aug 2013
Location: Gluckstadt, MS
Posts: 71
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Re: Help with wheels after disc conversion
No I am not driving, but want too. Looking for wheel info so i can get the right fit on the first try.
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#6 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,602
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Re: Help with wheels after disc conversion
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#7 |
Registered User
![]() Join Date: Aug 2019
Location: Cheraw
Posts: 1,305
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Re: Help with wheels after disc conversion
Its not the back spacing that is the problem. Its the design of the rim where it curves up. The rims were redesigned for more clearance when the trucks went to disc brakes.
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#8 |
67-72 parts collector,…
![]() Join Date: Nov 2002
Location: Mid-MO
Posts: 22,698
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Re: Help with wheels after disc conversion
Look at this thread,...
http://67-72chevytrucks.com/vboard/s...d.php?t=560599
__________________
Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823 |
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#9 | |
67-72 parts collector,…
![]() Join Date: Nov 2002
Location: Mid-MO
Posts: 22,698
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Re: Help with wheels after disc conversion
Quote:
Backspacing is the measurement taken on the BACK SIDE of the wheel. With 15” wheels you want no more than 3.5”-4” of backspacing. Even then with drop spindles you may need to grind a little clearance on the lower control arm.
__________________
Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823 |
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#10 |
Senior Member
![]() Join Date: Jul 2000
Location: North Texas
Posts: 3,488
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Re: Help with wheels after disc conversion
CPP strikes again! On my 69 C10 I used 73-87 spindles, rotors, and calipers with 73-87 8-inch rally wheels. Zero issues. Had a shop re-drill the rear axles for 5-on-5.
Too bad Early Classic Enterprises is gone. They sold stuff that actually fit! Did you call CPP?
__________________
Mike 1969 C10 LWB -- owned for 35 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, AAW wiring harness, 5-lug conversion, 1985 spindles and brakes. 1982 C10 SWB -- sold 1981 C10 Silverado LWB -- sold, but wish I still had it! 1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming. Retired as a factory automation products salesman. Worked part-time over the years for an engine builder and a classic car repair shop. Member here for 24 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then! |
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#11 | |
67-72 parts collector,…
![]() Join Date: Nov 2002
Location: Mid-MO
Posts: 22,698
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Re: Help with wheels after disc conversion
Quote:
The proble is trying to fit drum brake (pre-71) steel wheels on a disc brake rotor.
__________________
Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823 |
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#12 |
Registered User
Join Date: Jul 2019
Location: Beebe, AR
Posts: 2,458
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Re: Help with wheels after disc conversion
Agree. All my CPP stuff fit perfectly but I knew my original 67 wheels would not fit. Went with 15x8 rally's with the correct back spacing. All fit fine with no rubbing issues anywhere.
__________________
1967 C10 1980 Jeep CJ5 2020 Toyota 4Runner 2024 Toyota Tundra |
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#13 |
Senior Member
![]() Join Date: Jul 2000
Location: North Texas
Posts: 3,488
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Re: Help with wheels after disc conversion
I stand corrected. I'm just too quick to jump on CPP, having dealt with them in the past.
__________________
Mike 1969 C10 LWB -- owned for 35 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, AAW wiring harness, 5-lug conversion, 1985 spindles and brakes. 1982 C10 SWB -- sold 1981 C10 Silverado LWB -- sold, but wish I still had it! 1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming. Retired as a factory automation products salesman. Worked part-time over the years for an engine builder and a classic car repair shop. Member here for 24 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then! |
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#14 |
Registered User
Join Date: Aug 2013
Location: Gluckstadt, MS
Posts: 71
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Re: Help with wheels after disc conversion
Thanks for responses. I ordered a couple of wheels today that should fit after doing more research. Will know for sure in a few days.
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#15 | |
67-72 parts collector,…
![]() Join Date: Nov 2002
Location: Mid-MO
Posts: 22,698
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Re: Help with wheels after disc conversion
Quote:
Summit Racing seems to take the guess work out of buying CPP products. I would never buy directly from CPP.
__________________
Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823 |
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