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Mod | | | Forums66 Topics128,136 Posts1,056,745 Members48,454 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | | Joined: Apr 2009 Posts: 181 'Bolter | | 'Bolter Joined: Apr 2009 Posts: 181 | Usually, front tires would've been a notch down in size from the rear if there was a size difference. However, based on the tires that I have available and not wanting to spend more tire money, would there be any technical problem with putting 9.00x20's on the front and 8.25x20's on the rear? When I got the truck it had worn out 9.00x20's all the way around. This is on a 1958 Chevy Spartan 80 2.5 ton (single rear axle). It would be nice to hear your feedback on this. Thanks!
1955 GMC 630, 1959 GMC W660, 1958 Chevy Spartan 80
| | | | | Joined: Jan 2008 Posts: 4,962 'Bolter | | 'Bolter Joined: Jan 2008 Posts: 4,962 | There is nothing wrong with having a different size tire on front as the drivers. Smaller tires will cut your top speed some. If you actually haul something, 8.25 will haul a lot. Rock haulers used them here in the 60's because they were cheaper. It may look a little odd having 8.25 on the driver and 9.00 on the steer, but if you can live with that, there is nothing wrong with it. | | | | | Joined: May 2005 Posts: 8,878 . | | . Joined: May 2005 Posts: 8,878 | May or may not need to adjust the caster angle.
Grigg | | | | | Joined: Jan 2008 Posts: 4,962 'Bolter | | 'Bolter Joined: Jan 2008 Posts: 4,962 | I think he would have to have an awful short wheelbase to affect caster. If its a SWB, it will probably ride like a Teddy Roosevelt truck any way...a rough rider. | | | | | Joined: Apr 2005 Posts: 1,107 'Bolter | | 'Bolter Joined: Apr 2005 Posts: 1,107 | a friend of mine has 9.00's on his 6400. when the wheel is turned the tire rub on the springs. | | | | | Joined: May 2005 Posts: 8,878 . | | . Joined: May 2005 Posts: 8,878 | For an AD truck larger tires rubbing the springs and not turning as sharp is a concern, but I think on a 58 it's less of an issue? | | | | | Joined: Apr 2009 Posts: 181 'Bolter | | 'Bolter Joined: Apr 2009 Posts: 181 | Thanks for all the feedback! The truck is a long wheelbase: 192". The 9.00's on this truck don't seem to rub.
1955 GMC 630, 1959 GMC W660, 1958 Chevy Spartan 80
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