Go BottomDefinition of quot Minimum Turning radius quot
 | DennisCTB
Join Date: Nov 1998 Posts: 2707 NorthWest NJ 
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2001-09-23 31970
When looking at tractor specifications is "Minimum Turning Radius" = to the radius to the "outside" of the circle formed by the "Outside Wheels" ? Or is it the radius of the inner side Wheels?
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 | Norm
Join Date: Posts: 1 
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2001-09-23 31971
I have always believed it to be the inner wheels. ....
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| BillBass
Join Date: Feb 2002 Posts: 190 North Texas
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2001-09-24 31980
I always assumed it meant the outside dimension. Essentially the minimum distance within which you could make a uturn and clear two parallel objects such as two fences. Or the minimum distance you could reverse direction when cultivating or otherwise working a field. ....
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 | Murf
Join Date: Dec 1999 Posts: 7249 Toronto Area, Ontario, Canada
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2001-09-24 31981
I'm not sure myself, but I do know that in most instances any specification related to the dimensions of or related to the tractor, 'tread' measurements normally refer to 'centerline' measurements (ie, wheelbase, track width, etc.) and 'physical' measurements refer to overall dimensions (ie, o'all length or width, transport height, etc.). By making the specification related to centerline measurements it is an easy calculation for someone to arrive at the "real world" turning radius for a tractor using tires and or rims other than used in the calculation of the given figures, such as the case for 'row crop' or 'orchard' machines. ....
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| Norm
Join Date: Posts: 1
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2001-09-24 31992
Well, I did some searching to try to find something resembling a standard definition. Nothing specific to tractors, but I have found a few (and they were far between!) statements with regard to road vehicles. The consensus of these works, from various countries and the state of Texas, is that the turning radius is to the outside wheel. Does that apply to the specification used for tractors as well? If I find anything, I'll let you know..... ....
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 | Art White
Join Date: Jan 2000 Posts: 6898 Waterville New York
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2001-09-26 32032
The manufacturers often use wheel tread settings that give them an advantage in turning. There is much that goes in to the advertised spec's in literature. Smaller front tires turn tighter than large ones some wheel spacings require less turning ability without tire interference with the tractor chassis. ....
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| MarkS
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2001-09-26 32043
Good points Art, as with any manufacturer they are going to set things up in such a way as to make their machine look like it performs better. Best way to figure it out is get on a machine set up the way you need it and go from there. ....
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| David Brienza
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2001-09-29 32099
If the outside wheel track is used to define the minimum turning radius then there would be no such thing as a zero turning radius as is claimed on zero turn riding mowers, etc. Then again, if the inside wheel track radius is used as a definition, you couldn't distinguish between a vehicle that could spin around its center like a zero turn rider and a vehicle that could, for example, spin around one of the rear wheels.
-Dave ....
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