What wheel backspace should I use on CPP Modular spindles - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Ontcalimo · 11-27-2015, 07:22 PM

Hello, I would like to get advice from members that have CPP modular drop spindles on their 67-68 c10's with CPP disc brake system. I like to run a 20 X 8.5 wheels on the front. It has a static drop of about 4 inches in the front. I am not sure what backspace I used use. I like to purchase a set of wheels which I will likely run a 45 series tires, like a 245 or 255X 45 20's. I do not want wheels rubbing stock inner fenders. There are few posts that talk about this subject, but I noticed many members who do not have this system give their opinions. Their recommended measurements vary from 4.5 to 5.75. and this confuses me. I like to hear from members that actually have this system or have accurate prior knowledge about this subject. My understanding the CPP modular spindles bring the wheels about 3/4 (.75) inches narrower (however some dispute these figures). I'd like to hear from them what works measurements works and what backspacing will not rub fenders. I also like to hear what backspace they have used on rear wheels on 20X10 with early rear end with a drop of at least 6 inches in the rear.

Ontcalimo · 12-05-2015, 09:40 PM

No one?

Carmen Black · 12-05-2015, 10:16 PM

I don't have much to offer here, but will say that if you are too close to the fenders by a little, you can always add wheel spacers to push them back out. I had to do this with my drop spindles so my 15 inch wheels would clear the lower A-Arm.

For something as expensive as wheels and tires, I would probably get a local tire shop that sells aftermarket rims involved. They might mock up a couple of different combinations to see how they would work on the truck for you.

'68 Newtricks · 12-06-2015, 01:09 AM

Wish my truck was running, I'd drive it over. I can give you my measurements, but have yet to drive it. Soooooooo I'm hoping it doesn't rub.

Ontcalimo · 12-09-2015, 02:09 AM

I wish they don't rub too 68 new tricks. I hope other people can give more advice. I know there are venders here, but I hate to ask for just the info.

Ontcalimo · 12-09-2015, 02:12 AM

Thanks for your reply Carmen black.

11-27-2015, 07:22 PM	#1
Ontcalimo Registered User Join Date: Nov 2011 Location: Ontario, California Posts: 65	What wheel backspace should I use on CPP Modular spindles Hello, I would like to get advice from members that have CPP modular drop spindles on their 67-68 c10's with CPP disc brake system. I like to run a 20 X 8.5 wheels on the front. It has a static drop of about 4 inches in the front. I am not sure what backspace I used use. I like to purchase a set of wheels which I will likely run a 45 series tires, like a 245 or 255X 45 20's. I do not want wheels rubbing stock inner fenders. There are few posts that talk about this subject, but I noticed many members who do not have this system give their opinions. Their recommended measurements vary from 4.5 to 5.75. and this confuses me. I like to hear from members that actually have this system or have accurate prior knowledge about this subject. My understanding the CPP modular spindles bring the wheels about 3/4 (.75) inches narrower (however some dispute these figures). I'd like to hear from them what works measurements works and what backspacing will not rub fenders. I also like to hear what backspace they have used on rear wheels on 20X10 with early rear end with a drop of at least 6 inches in the rear.

12-05-2015, 09:40 PM	#2
Ontcalimo Registered User Join Date: Nov 2011 Location: Ontario, California Posts: 65	Re: What wheel backspace should I use on CPP Modular spindles No one?

12-05-2015, 10:16 PM	#3
Carmen Black Registered User Join Date: Aug 2013 Location: Cary, NC Posts: 60	Re: What wheel backspace should I use on CPP Modular spindles I don't have much to offer here, but will say that if you are too close to the fenders by a little, you can always add wheel spacers to push them back out. I had to do this with my drop spindles so my 15 inch wheels would clear the lower A-Arm. For something as expensive as wheels and tires, I would probably get a local tire shop that sells aftermarket rims involved. They might mock up a couple of different combinations to see how they would work on the truck for you. __________________ Carmen Black Build 1971 SWB - Base Model

12-06-2015, 01:09 AM	#4
'68 Newtricks Registered User Join Date: Feb 2014 Location: Los Angeles area :( Posts: 499	Re: What wheel backspace should I use on CPP Modular spindles Wish my truck was running, I'd drive it over. I can give you my measurements, but have yet to drive it. Soooooooo I'm hoping it doesn't rub. __________________ '68 C10 SWB '85 K30 Blazer

12-09-2015, 02:09 AM	#5
Ontcalimo Registered User Join Date: Nov 2011 Location: Ontario, California Posts: 65	Re: What wheel backspace should I use on CPP Modular spindles I wish they don't rub too 68 new tricks. I hope other people can give more advice. I know there are venders here, but I hate to ask for just the info.

12-09-2015, 02:12 AM	#6
Ontcalimo Registered User Join Date: Nov 2011 Location: Ontario, California Posts: 65	Re: What wheel backspace should I use on CPP Modular spindles Thanks for your reply Carmen black.

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