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.

Re: Help with wheels after disc conversion
 

I sure hope your not driving it like that ? those wheels are destroyed . :smoke:

Re: Help with wheels after disc conversion
 

Drum brake wheels do not fit with disc brakes
The inside area hits the caliper

Re: Help with wheels after disc conversion
 

You kept it 6 lug? If so 71-87 6 lug 4x4 rims should work just fine.

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.

Re: Help with wheels after disc conversion
 

Try this.


https://www.hotrod.com/articles/ccrp...heels-fitment/

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.

Re: Help with wheels after disc conversion
 

Look at this thread,...
http://67-72chevytrucks.com/vboard/s...d.php?t=560599

Re: Help with wheels after disc conversion
 

Also do a search about backspacing.
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.

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?

Re: Help with wheels after disc conversion
 

This isn’t a CPP problem.
The proble is trying to fit drum brake (pre-71) steel wheels on a disc brake rotor.

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.

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.

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.

Re: Help with wheels after disc conversion
 

I also hate to defend CPP because I’ve had issue with them also.
Summit Racing seems to take the guess work out of buying CPP products.
I would never buy directly from CPP.