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Implement Alley Discussion Forum

Where do I find old tire size diameters?

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PWOG

05-28-2004 17:52:26




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I have a side-dress fertilzer unit (John Blue) that I mounted on a compact diesel. It drives off the rear axle and calibration computations are based on the older tire sizes. 10x38,11x36 and 14x30 all are the same diameter but I don't know what that is. Does anyone here know?
Other size examples are 11x38,12x36 and 15x30 which are all the same unknown diameter.
12x38 and 13x36 appear to be same diameter.
Any help where to look would be appreciated so I can correctly calibrated. Thank you.

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Rick

05-29-2004 07:22:53




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 Re: Where do I find old tire size diameters? in reply to PWOG, 05-28-2004 17:52:26  
put a rubber strap horizontally around the tire. I use rbber straps and do this on everything to get my setting. Go thru the field and now measure from mark to mark to find actual distance of travel. Rick



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Norm

05-29-2004 05:57:47




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 Re: Where do I find old tire size diameters? in reply to PWOG, 05-28-2004 17:52:26  
How about 58" for the first set and 60" for the second set, assuming tire width and height is 1:1, as in 38"+(10"x2)=58" or 36"+(12"x2)= 60".



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Hugh MacKay

05-29-2004 04:27:19




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 Re: Where do I find old tire size diameters? in reply to PWOG, 05-28-2004 17:52:26  
PWOG: Don't get hung up on the tire sizes. JMS has explained the size changes for you. Any chart you have with such equipment is only a guide and not an absolute guarentee on rate of application. Even if you have the specified correct tire, there is substancial difference between new and worn tires.

Calabration with such equipment is an annual event. Place the fertilizer discharge in a pail and drive a measured distance. You can calculate and adjust from there. Time consuming yes, but necessary with all seeding, fertilizing, dry or liquid applicators, if you want accuracy.

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JMS/MN

05-28-2004 22:13:15




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 Re: Where do I find old tire size diameters? in reply to PWOG, 05-28-2004 17:52:26  
Don't worry about diameters. The first number refers to rim width, and about 1960, +- a few years, tire mfgrs changed the number system. 10 became something like 11.2, 11 became 12.4, 14 became 16.9, etc. New marking system refers to the cross-sectional width of the tire- the bulge, rather than the rim width. Second number refers to the rim diameter.



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