SCRAP

on an m813 cargo, what kind of speed increases will you get with 395s or 53 inch michelins, truck has nh250 cummins , I want to run 6 super singles on the truck. thanks

davidkroberts

i got about 8 mph increase between the stock m35a2 tire and the 395s on it now. whats the overall height on the 11.00x20s on it?

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Dave in Tenn

19?? M818 tractor
1985 Bombardier Iltis
196? M35A2w/hardtop
196? M35A2 W/softop
1985 M1009 Blazer (2)
1968 Kaiser Jeep M715
1961 Mercedes Unimog 404
19?? MEP-002A 5KW Generator (sold)
1970 Gama Goat (sold)
19?? MEP-003A 10KW Generator (2)
1966 M101 3/4 ton trailer

M813A1

I got a 8 mph gain is what I got on my M813 when I had 1400X R20's super singles on !! But I did loose pulling power because of the lack of Torque lost because of the taller tires !!

Hammer

Redline stock on my 818 went from 52 is to 70 ish.
Lost LOTS of power doing it that way.

FMFDOC

From 52 to 70?

Hammer

Whoops, when I put the 16.00's on it...
Kind of an important fact to leave out.

It cruises well at 60 to 65 mph. But really lacks the power when I want/need it.

gringeltaube

Assuming you are running the 11.00-20 NDTs?

Looking at the Michelin XZL specs chart below... and also assuming that 11.00-20s and 11.00R20s are very close considering loaded radius and revolutions per mile...


then, at constant rpm, 52 mph would be increased to:

• 56mph with 395/85R20
• 60mph with 14.00R20
• 63mph with 16.00R20

G.

Attached Images

	Michelin XZL Military Tires.jpg (83.9 KB, 33 views)

yamabro

So at least with the 395's you shouldn't notice that much of a power loss.

Hammer

Well, my gps was reading 71 mph, but the tach was around 2300 ish. Didn't pay THAT close attention, just know that was where it topped out at.
Still, 63 mph sounds too low for 2150 rpm. But maybe my tach isn't so accurate....

SCRAP

any mileage increase with the larger tires ?