Bagged stepside wheel question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

dwalt14 · 04-25-2017, 10:36 PM

I have a 70 stepside that is bagged. I have a 18x8 wheel on it now but am upgrading to a 20x8.5. Question is what backspace or offset do I need to run to fit inside the fenderwells with no modifications. Have stock width rear end with drum brakes

Mike C · 04-26-2017, 08:33 AM

70 was a crossover year. Some of the early trucks may have the narrower rear axle, so take that into consideration.

My 69 with a 71 rear axle has 17x9 zero offset rims (5" back space). It mounts 275 55 17. It gets you a thumb widths clearance on either side of the tire. My leaf spring truck is flipped so dropped 7" effectively in rear.

04-25-2017, 10:36 PM	#1
dwalt14 Registered User Join Date: Mar 2011 Location: Pearland, TX Posts: 70	Bagged stepside wheel question I have a 70 stepside that is bagged. I have a 18x8 wheel on it now but am upgrading to a 20x8.5. Question is what backspace or offset do I need to run to fit inside the fenderwells with no modifications. Have stock width rear end with drum brakes

04-26-2017, 08:33 AM	#2
Mike C Registered User Join Date: Dec 1999 Location: Austin, TX, USA Posts: 7,728	Re: Bagged stepside wheel question 70 was a crossover year. Some of the early trucks may have the narrower rear axle, so take that into consideration. My 69 with a 71 rear axle has 17x9 zero offset rims (5" back space). It mounts 275 55 17. It gets you a thumb widths clearance on either side of the tire. My leaf spring truck is flipped so dropped 7" effectively in rear. __________________ 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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