The Ford Barn

mainiac239 · 06-23-2012, 07:02 AM

working on a 47 "big" 1.5 ton truck

going to use 7.50 x 20 on front and dual 8.25 x 20 on back
is there any info on the max and min rim width to use with each tire size

thanks

truckdog62563 · 06-23-2012, 07:41 AM

The 7.50" was spec'd for a 5.00" rim, and the 8.25" was spec'd for a 6.00" rim. Generally there was a half inch over/under in the permissible range. Stu

peteyshoes · 06-23-2012, 07:58 AM

i have 7,50x20's on mine. sitting on 6.50 rims. no issues. split rings off an old milk tanker. stay away from widow makers.

Barlea · 06-23-2012, 08:32 AM

8.25s may be too close together on the duals unless there is sufficient rim width to provide enough offset. ..B.

truckdog62563 · 06-23-2012, 08:50 AM

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The National Wheel and Rim Association published their standards for tire/rim fitment annually. Wheels were manufactured to afford the necessary width and offset to meet those standards within permissible over and under limits. An 8.25" tire on a 6" rim will not rub, but probably would on a 5" rim. And Pete, those 7.50s probably work ok, but are a stretch on a 6.5" rim. Stu

06-23-2012, 07:02 AM	#1
mainiac239 Member Join Date: May 2010 Posts: 47	looking for 47 truck rim width info working on a 47 "big" 1.5 ton truck going to use 7.50 x 20 on front and dual 8.25 x 20 on back is there any info on the max and min rim width to use with each tire size thanks

06-23-2012, 07:41 AM	#2
truckdog62563 Senior Member Join Date: May 2010 Location: Rochester, Il Posts: 599	Re: looking for 47 truck rim width info The 7.50" was spec'd for a 5.00" rim, and the 8.25" was spec'd for a 6.00" rim. Generally there was a half inch over/under in the permissible range. Stu __________________ Stu McMillan Marmon-Herringtons

06-23-2012, 07:58 AM	#3
peteyshoes Member Join Date: Sep 2011 Location: middletown ny Posts: 90	Re: looking for 47 truck rim width info i have 7,50x20's on mine. sitting on 6.50 rims. no issues. split rings off an old milk tanker. stay away from widow makers.

06-23-2012, 08:32 AM	#4
Barlea Senior Member Join Date: May 2010 Location: West Central Alberta Posts: 441	Re: looking for 47 truck rim width info 8.25s may be too close together on the duals unless there is sufficient rim width to provide enough offset. ..B.

06-23-2012, 08:50 AM	#5
truckdog62563 Senior Member Join Date: May 2010 Location: Rochester, Il Posts: 599	Re: looking for 47 truck rim width info Sponsored Links (Register now to hide all advertisements) The National Wheel and Rim Association published their standards for tire/rim fitment annually. Wheels were manufactured to afford the necessary width and offset to meet those standards within permissible over and under limits. An 8.25" tire on a 6" rim will not rub, but probably would on a 5" rim. And Pete, those 7.50s probably work ok, but are a stretch on a 6.5" rim. Stu __________________ Stu McMillan Marmon-Herringtons