The Ford Barn

1948F-1Pickup · 12-10-2018, 03:04 PM

Has anyone got this number? I looked in the manuals but didn't find anything.
You'd use a line through the king pin, down to the ground.... whatever spot
it hits. And then the center of the tire tread, whatever point that is sitting on the ground. It's the distance between the two points on the ground.

I've got non-stock rims, so I'm going to get a non-stock answer.

Ross F-1 · 12-11-2018, 01:05 AM

About the closest thing to that is king pin inclination, which is shown how to measure on p. 326 of the 48-51 manual. It is spec'd at 6 deg. With some measurements of your own, I think you could calculate scrub radius.

What kind of rims are you running?

truckdog62563 · 12-11-2018, 06:21 AM

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Is it possible, Ross, to reverse calculate an answer here? For instance, we know that front axle 7RC 3010B has an 8° Kingpin Inclination (page 365 of the Service Manual), minus your 6° page 326 info for camber adjustment, and we know that there is a 58” front track width when factoring .62” of positive offset in each front wheel.

The below chart, page S10 - Unit Design Features section of the 6/51 Dealer Handbook, shows turning circle diameter of 43’ on the left and 42.5’ on the right. Those diameters would have been recorded with the maximum tire size of 6.50-16” which has an outside diameter of 30”, or radius to the ground of 15” at the spindle. Would we still need the distance from the C/L of the Kingpin to the C/L of the tire to do the math? Or are there too many other variables? I’m scratching my head. Stu

12-10-2018, 03:04 PM	#1
1948F-1Pickup Senior Member Join Date: Oct 2015 Location: Socal Posts: 795	F-1 scrub radius Has anyone got this number? I looked in the manuals but didn't find anything. You'd use a line through the king pin, down to the ground.... whatever spot it hits. And then the center of the tire tread, whatever point that is sitting on the ground. It's the distance between the two points on the ground. I've got non-stock rims, so I'm going to get a non-stock answer.

12-11-2018, 01:05 AM	#2
Ross F-1 Senior Member Join Date: Nov 2010 Location: NM Posts: 2,438	Re: F-1 scrub radius About the closest thing to that is king pin inclination, which is shown how to measure on p. 326 of the 48-51 manual. It is spec'd at 6 deg. With some measurements of your own, I think you could calculate scrub radius. What kind of rims are you running? __________________ '52 F-1, EAB flathead

12-11-2018, 06:21 AM	#3
truckdog62563 Senior Member Join Date: May 2010 Location: Rochester, Il Posts: 599	Re: F-1 scrub radius Sponsored Links (Register now to hide all advertisements) Is it possible, Ross, to reverse calculate an answer here? For instance, we know that front axle 7RC 3010B has an 8° Kingpin Inclination (page 365 of the Service Manual), minus your 6° page 326 info for camber adjustment, and we know that there is a 58” front track width when factoring .62” of positive offset in each front wheel. The below chart, page S10 - Unit Design Features section of the 6/51 Dealer Handbook, shows turning circle diameter of 43’ on the left and 42.5’ on the right. Those diameters would have been recorded with the maximum tire size of 6.50-16” which has an outside diameter of 30”, or radius to the ground of 15” at the spindle. Would we still need the distance from the C/L of the Kingpin to the C/L of the tire to do the math? Or are there too many other variables? I’m scratching my head. Stu __________________ Stu McMillan Marmon-Herringtons Last edited by truckdog62563; 12-11-2018 at 06:37 AM.