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Old 06-10-2021, 12:58 PM   #1
Larry S
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Tire & wheel size

I have 69 C10 swb . Lowered 2 1/2 front, 4 in rear. Im thinking about 18s or 20s. Would love to see pics of some that are lowered similar with wheel & tire size and backset. Thank you
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Old 06-10-2021, 05:05 PM   #2
70cst
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Re: Tire & wheel size

When you get new wheels - be sure you have the proper Back Spacing or else you might hit the Lower Control Arm when you turn.
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Old 06-10-2021, 11:55 PM   #3
Larry S
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Quote:
Originally Posted by 70cst View Post
When you get new wheels - be sure you have the proper Back Spacing or else you might hit the Lower Control Arm when you turn.
Thanks. Do you know what it is?
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Old 06-11-2021, 01:00 AM   #4
Accelo
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Re: Tire & wheel size

Here is a picture of 20" on a SWB 1970.
Back spacing is zero.
fronts are 8.5" and the rears are 10"
Rick
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Old 06-11-2021, 07:52 AM   #5
70cst
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Re: Tire & wheel size

Quote:
Originally Posted by Larry S View Post
Thanks. Do you know what it is?
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I had to go from 15x8's to 15x7's on the front with a 3" BS ... but I have read some drop spindles have adjustmets designed in them so one doesnt need to change BS. My 15x8's had a 4: BS.
Hopefully others will chime in.
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67-72 Chevy and GMC Trucks...The Classic Truck for the Classic Folk.

1970 CST Two tone green, 402BB, 400 Automatic, Tach, Buckets, AC, AM-FM, Tilt, GM CB, GM 8 Tract, LWB, etc

JOHN 17:3...The better side of "LIFE"


Remember: Everyday is a good day...Some are just gooder!
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Old 06-11-2021, 10:57 PM   #6
Larry S
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Quote:
Originally Posted by 70cst View Post
I had to go from 15x8's to 15x7's on the front with a 3" BS ... but I have read some drop spindles have adjustmets designed in them so one doesnt need to change BS. My 15x8's had a 4: BS.
Hopefully others will chime in.
The 15 I have on mine hit control arms as well.
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Old 06-13-2021, 06:19 PM   #7
Mike C
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Re: Tire & wheel size

Zero offset works best. That is where the mounting flange for the wheel is in the very center of the rim. 15" wheels can be a challenge. I have 17x8 on the front of mine with 4.5" back spacing (wheel width is measured between the tire sealing surfaces or "between the beads" so a 17x8 inch rim is 9" wide outside to outside, so 4.5" in from the back is exactly 1/2 way to the front, so it is not offset at all). I have 235 55 17 tires mounted. In the rear I run a 17x9 once again zero offset, so 5" back space with 275 55 17 tires. My '69 has a '71 5 lug axle swapped in and my truck is a stepside on leaf springs. All of those things have to be in alignment for that tire to work on a stepper. You have much more space in the rear on a fleetside truck as well as if you have coils.
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Old 06-14-2021, 12:51 PM   #8
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Re: Tire & wheel size

Hey Mike C do you have any photos you can post?
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Old 06-15-2021, 08:59 AM   #9
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Re: Tire & wheel size

Here you go.

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72 Jimmy 4WD 4spd 4" & 35's
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Old 06-15-2021, 11:52 AM   #10
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Re: Tire & wheel size

Nice stance and tire size.
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