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Figuring Out Tire Size...?


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#1 middleageddeere OFFLINE  

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Posted July 04, 2012 - 08:32 AM

Ok, so I recently got this JD 650 that needs tires sometime soon. The tires on it are only marked with 9.5 16 r1. I am having a hard time finding many options in this tire size. Can anyone tell me what that means? Or what tire sizes I could substitute? I get standard tire sizes and even relatively understand metric, but this does not make sense to me...Thanks in advance

#2 Ryan313 OFFLINE  

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Posted July 04, 2012 - 08:40 AM

R1 is the tread pattern, they should be just plain AG tires with nothing special. They are on a 16 inch rim and 9.5 is how wide they are. Try Googling 9.5-16 tire.
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#3 middleageddeere OFFLINE  

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Posted July 04, 2012 - 08:41 AM

Ok that is what I thought...How do you tell the height/diameter then?

#4 MH81 OFFLINE  

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Posted July 04, 2012 - 08:46 AM

Yes, that's the old numbering system. Some guys have referred to it as the Bias system over the years.

You want to double check me here, but I believe with ag tires, the size "9.5" isn't the same in both old and new measurements. If you measure the outside of the tire or the rim, I think you will end up with a measurement of closer to 10. (or 10.5 actual tire width)


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#5 Ryan313 OFFLINE  

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Posted July 04, 2012 - 08:47 AM

Ok that is what I thought...How do you tell the height/diameter then?


Since it's not in the listed tire size, you would have to measure it. But, since its not in the size then you still can't compare it to other tires. I would go to different local places and look at different tires, so you can figure out what you want. Then order them or buy them from wherever you normally do.
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#6 middleageddeere OFFLINE  

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Posted July 04, 2012 - 08:52 AM

Ok, here is the full story. I want to try to find one used tire since I really only need one. I would like to be able to call up the tractor dealers in the area and see if I can match the one tire. However, if not I want to know what tire will fit on those rims and on the tractor, sounds like I need to measue the one I got though. Also, I have read that this tractor has a 6 bolt 6mm pattern, is there any way to double check that? Can I just measure from the middle of one bolt to the next?

#7 Ryan313 OFFLINE  

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Posted July 04, 2012 - 08:56 AM

Here is a diagram that shows how to measure lug pattern. The hole is probably what they are referring to as 6mm.

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#8 middleageddeere OFFLINE  

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Posted July 04, 2012 - 08:59 AM

Aweseome that is a big help, thanks.

#9 MH81 OFFLINE  

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Posted July 04, 2012 - 09:04 AM

Doing a little searching online & it looks like most manufacturers jump from 9.5 to 11.2 in that tire size.
Deestone site is down for maintenance, but they usually follow suit.

Firestone used to make one, if you have a firestone dealer in the area, worth the call to see if they have NOS.
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#10 JDBrian OFFLINE  

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Posted July 04, 2012 - 09:06 AM

This might be a start for dimensions. Carlisle makes an AG tire in that size. The dimensions are in the table here.
http://www.carlislet...truction/Tires7
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#11 RoosterLew OFFLINE  

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Posted July 04, 2012 - 09:12 AM

Try looking at M.E. Miller's site. I think there is a table that converts the old sizes to new. If not I know it is in his catalog. I would call them. They are very helpful and knowledgeable.
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#12 middleageddeere OFFLINE  

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Posted July 04, 2012 - 09:37 AM

Wow, very helpful. Thanks guys.




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