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01-29-2025, 02:29 PM
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#1 |
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Registered User
Join Date: Nov 2018
Location: Tieton,WA
Posts: 65
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help with tire size
I have a 72 k20 with 4" rough country spring lift. debating on installing 33" or 35" tires. I will be mounting them on 10" wide x 16" diameter wheels
motor is stock 350. basically a road princess. wondering what others thoughts are on this combo thanks |
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01-29-2025, 02:46 PM
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#2 |
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All stock and staying that way
  
Join Date: Jul 2003
Location: Elkland, PA
Posts: 2,500
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Re: help with tire size
K20 will have a minimum 4.10:1 gear ratio, so the 33"-35" tire size will actually make the truck much easier to tolerate at highway speeds, and the 350 will have enough torque to move it adequately.
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1970 K/5 Blazer CST 4WD, TOTM winner December 2024! Medium Bronze poly, 93k ACT. miles, 350, 4 speed, rear positraction, 16.5" x 8.25" HD Kelsey Hayes wheel option, tilt, tach, vacuum, AM/FM, manual throttle...Dad ordered and purchased new 4/70. Frame off restored 1970 K20, To be a clone of my Grandfather's K20, Dark Blue poly, 350, 4 speed, 16.5" X 8.25" Kelsey Hayes wheel option, tilt, tach, vacuum, AM radio. Latest project truck 1972 Cheyenne Super 20 2WD, Dark Blue/White, 90K ACT. miles, 402, TH400, 4.10 open, tilt, tach, vacuum, A/C, AM/FM, manual throttle.. A mostly original paint never rusted Texas survivor...  2017 Sierra 1500 SLT 4WD, Black, 51k miles, 5.3, 6L80E, 3.42 LS, 20" polished wheels, everything but moonroof and 6.2... 2019 Canyon SLT 4WD, White, 71k miles, 3.6, 8L45, 3.23 LS, 18" wheels |
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01-29-2025, 02:52 PM
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#3 |
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Registered User
Join Date: Nov 2018
Location: Tieton,WA
Posts: 65
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Re: help with tire size
looking for some info on the 33" vs 35"
guy at tire shop was a little negative on 35's checking to see if anyone had negative experience with the 35 vs 33 ie.. rubbing or ride things |
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01-29-2025, 04:05 PM
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#4 |
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Senior Member
Join Date: Feb 2016
Location: Muskegon, MI
Posts: 405
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Re: help with tire size
My '68 has a 2" lift with 285/75-16's (equal to 33's), no rubbing at all. Drives great.
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1966 Custom Camper C20 -327, 3OTT 1968 Chevrolet K20 - 350, 4 speed 1972 K10 SWB - 400, 3OTT 2003 Corvette Z06 - LS6 5.7L, 405HP 2013 Tahoe LT - 5.3L V8 2015 Silverado 2500HD - 6.0L V8 |
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01-29-2025, 04:33 PM
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#5 |
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Registered User
Join Date: Nov 2022
Location: Willits, CA
Posts: 30
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Re: help with tire size
I have a 70' K20 with a 4" lift and i'm running 35's. I have 4.10 gears and a Tremec 4050 5spd trans.
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01-29-2025, 07:21 PM
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#6 |
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Registered User
Join Date: Nov 2018
Location: Tieton,WA
Posts: 65
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Re: help with tire size
nice looking trucks
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01-29-2025, 08:40 PM
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#7 |
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All about them K’s
 
Join Date: Jun 2014
Location: Land of Entrapment
Posts: 6,976
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Re: help with tire size
1972 K20 around 5” lift in the rear and 4”+ a little in the front because of the dana 60 I swapped in, 315/75R16 (as similar as you will get with 16” wheels to 35’s) on 10” wheels. 350/SM465. Runs about 2600 RPM at 70 MPH. Doesn’t rub under normal driving conditions, and have only had it run once or twice off road fairly flexed out.
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Tyler '57 3100 http://67-72chevytrucks.com/vboard/s...d.php?t=813888 '72 K20 Cheyenne: 5” lift, 35’s, front dana 60 blah blah blah… http://67-72chevytrucks.com/vboard/s...d.php?t=662879 ‘69 K10 SWB: 4” lift 33”s… in a million pieces http://67-72chevytrucks.com/vboard/s...d.php?t=805206 '98 Silverado LT K2500HD ECLB Vortec 454/4l80E: 6" lift 35x12.5x20’s |
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