20x14 coys - The 1947 - Present Chevrolet & GMC Truck Message Board Network

1moretoy · 07-30-2011, 08:11 PM

CAN I run 20x14 coys on the back of my 70 c10 without narrowing the frame rails. the truck was a short step now it a short fleet. If I can what backspace would I need. thanks

Zoomin · 07-30-2011, 10:53 PM

I doubt it, but call them. They know C10's real well.

1moretoy · 05-04-2012, 08:57 PM

Old thread but anyone know what I would need to make them fit. Thanks
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**Hart_Rod** · 05-05-2012, 10:21 AM

Quote:

Originally Posted by 1moretoy

Old thread but anyone know what I would need to make them fit. Thanks
Posted via Mobile Device

You'll have to narrow the rearend approximately 5" each side because Coys only offers them in a couple of back spacing options (5,4.5??). This wil probably necessitate some frame modifications, but I'm not sure exactly what. If you go with a wheel that offers more back spacing options, you could do it with out narrowing the rear. I have 20x12's (7" bs) on the back of my truck and the only modifications are widened tub and removed the bump stop bracket.
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BossHogg69 · 05-05-2012, 10:50 AM

I'm running 18x12's with 7" bs also - there is plenty of clearance between the inside of my wheels and the frame rails, easily 3+ inches. You could always get the Coys and have them widened toward the inside like I did with my Boss 338's. I will say that careful use of a measuring tape will be your best friend in trying to find out what will work on your particular truck.

okyankee · 05-05-2012, 11:19 AM

Quote:

Originally Posted by Hart_Rod

You'll have to narrow the rearend approximately 5" each side because Coys only offers them in a couple of back spacing options (5,4.5??). This wil probably necessitate some frame modifications, but I'm not sure exactly what. If you go with a wheel that offers more back spacing options, you could do it with out narrowing the rear. I have 20x12's (7" bs) on the back of my truck and the only modifications are widened tub and removed the bump stop bracket.
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what size tires are you running on the back?

**Hart_Rod** · 05-05-2012, 12:33 PM

Quote:

Originally Posted by BossHogg69

I'm running 18x12's with 7" bs also - there is plenty of clearance between the inside of my wheels and the frame rails, easily 3+ inches. You could always get the Coys and have them widened toward the inside like I did with my Boss 338's. I will say that careful use of a measuring tape will be your best friend in trying to find out what will work on your particular truck.

Who widened them for you?

Quote:

Originally Posted by okyankee

what size tires are you running on the back?

31 x 16 Mickey Thompso Sportsman Radial.
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07-30-2011, 08:11 PM	#1
1moretoy Registered User Join Date: Jul 2008 Location: san jose ca Posts: 467	20x14 coys CAN I run 20x14 coys on the back of my 70 c10 without narrowing the frame rails. the truck was a short step now it a short fleet. If I can what backspace would I need. thanks

07-30-2011, 10:53 PM	#2
Zoomin Man of Mini-Talents Join Date: Sep 2009 Location: Oklahoma City, OK Posts: 4,295	Re: 20x14 coys I doubt it, but call them. They know C10's real well. __________________ Steve Project - Ruth 66 Skylark Project - Lola 60 Biscayne Project - Iron Ox 54 GMC 100 Project - Darth 69 Camaro

05-04-2012, 08:57 PM	#3
1moretoy Registered User Join Date: Jul 2008 Location: san jose ca Posts: 467	Re: 20x14 coys Old thread but anyone know what I would need to make them fit. Thanks Posted via Mobile Device

05-05-2012, 10:50 AM	#5
BossHogg69 motor exploder Join Date: Mar 2009 Location: Pittsburgh, PA Posts: 2,346	Re: 20x14 coys I'm running 18x12's with 7" bs also - there is plenty of clearance between the inside of my wheels and the frame rails, easily 3+ inches. You could always get the Coys and have them widened toward the inside like I did with my Boss 338's. I will say that careful use of a measuring tape will be your best friend in trying to find out what will work on your particular truck. __________________ Adam 1969 Chevy CST/10 stepside, DART Big M/TREMEC Magnum Extreme/3.73's w/Detroit Truetrac 1965 Chevy Bel Air Wagon (daily driver), 327/TH350,10 bolt w/3.08's 1961 Chevy Bel Air Sport Coupe, ZZ454/M21/9" rear w/3.50's & Detroit Truetrac 2005 GMC 1500 ccsb 2wd, 6.0L/4L65e/3.73 G80 2006 GMC 2500HD ccsb 4x4, DMax LBZ/Allison 6spd/4.56's w/Detroit TrueTrac Use the SEARCH function on this forum - it is your friend!!

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