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post #1 of 11 Old 04-20-2019, 10:45 AM Thread Starter
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646 Rear Tires

I know the subject of rear tires for a 646 is a tricky one. The correct size R-1 aren't made any longer. It seems most people either go to skid steer tires, or something larger like the 29x12.50-15 Carlisle Tru Power. After much reading on the subject I think I'm going to go with the Tru Powers.

Currently there are passenger tires 215/75R15 installed with chains and filled with washer fluid. As you might guess, traction has been poor on my gravel drive and in the dirt. People have mentioned using the 29x12.50-15 but having to replace the wheel and use "spacers", however I don't know what these spacers are or how they are made. If anyone has gone this route with their 646, could you share any information as to the modifications that were necessary?
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post #2 of 11 Old 04-21-2019, 10:18 AM
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Couple of options discussed here New Rear Tires:
http://casecoltingersoll.com/showthr...the-646-loader

1973 Case 646 (w/Custom Power Steering)
1968 Case 155
1958 JI Case 310 Terratrac Crawler Loader
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post #3 of 11 Old 04-22-2019, 02:50 PM
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Re: 646 Rear Tires

I would get tires from Nebraska Tire they have the best price for top name brands, cheaper then the place in Ohio. Shipping is also cheaper. They also have a website.
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post #4 of 11 Old 04-23-2019, 08:17 AM Thread Starter
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Re: 646 Rear Tires

Thanks for the replies.

So, I have found these tires Carlisle Farm Specialist R-1 7-16 C/6PR

https://www.tires-easy.com/7-16/carl...irecode/570001

Carlisle lists them as having a mounted diameter of 29.1", so it should clear the fender, and a mounted width of 8.1" which is pretty close to what is mounted on there now.

Of course, I'll need new wheels, as these tires mount on 16" wheels. I've found these, 16" x 6" Implement / Agricultural Wheel 6-6" bolt circle, 4 5/8" center bore, +1 1/8" offset, 2800 lbs. capacity.

https://www.southwestwheel.com/p-2003-106307.aspx

I've seen elsewhere here, that the original wheels have a 1 1/4" offset and these wheels have a 1 1/8" offset. Does anyone think this 1/8" difference will be a problem?

I'm very excited to have a more useful tire on this tractor than the passenger tires that are currently mounted.....
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post #5 of 11 Old 04-23-2019, 09:49 AM
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Re: 646 Rear Tires

I am pretty sure you have offset and backspacing mixed up. The measurement that matters most in this application is the backspacing. You can measure that on your current wheels. You must match the backspacing of your current wheels.

This topic has had lots of previous discussions, you could learn a lot by reading it or pay the price for trying it your own way. It is not easy to do and it is custom work.
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post #6 of 11 Old 04-23-2019, 02:42 PM Thread Starter
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Re: 646 Rear Tires

Quote:
Originally Posted by ssmewing View Post
I am pretty sure you have offset and backspacing mixed up. The measurement that matters most in this application is the backspacing. You can measure that on your current wheels. You must match the backspacing of your current wheels.

This topic has had lots of previous discussions, you could learn a lot by reading it or pay the price for trying it your own way. It is not easy to do and it is custom work.
Yeah, I have read quite a bit on the subject here and some other places. The problem is, I haven't found anyone commenting on actually changing the wheels and tires. I'm trying to learn as much as I can before making a purchase.

The way I understand it is offset is the distance from the center line of the rim to the mounting surface. What is backspacing?
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post #7 of 11 Old 04-23-2019, 04:56 PM
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Go to a store that sells rims. They explain it there.

It has not been done because it is hard to do. It takes custom fabrication.
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post #8 of 11 Old 04-23-2019, 05:56 PM
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Re: 646 Rear Tires

I'm casually looking for a set of rears for my MF/Snapper 1855, which are currently 12" w/ 6x6 bolt pattern.
I'd like 14's because that is a common UTV tire size.
Apparently this is a farm implement size., so that's where I'm looking.

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MF / Snapper 1855
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post #9 of 11 Old 04-24-2019, 01:50 PM
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Re: 646 Rear Tires

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Originally Posted by DL-North View Post
I'm casually looking for a set of rears for my MF/Snapper 1855, which are currently 12" w/ 6x6 bolt pattern.
I'd like 14's because that is a common UTV tire size.
Apparently this is a farm implement size., so that's where I'm looking.
I have a similar pair of wheels on my 644 project. I think they came from a Sears tractor fo similar age to your 1855 14" wheels are available new for these, but offset/backspacing may be an issue.. I'm using 27x12-12 ATV tires on mine. Slightly smaller OD than the original 15s, but much larger footprint. Same as the loader/BH version from Case.
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post #10 of 11 Old 04-26-2019, 11:59 AM
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Re: 646 Rear Tires

The Carlisle Farm Specialist 7 - 16's do actually fit on a Case 64x tractor.. In my case I used rims from a Case 446 which I was scrapping. That seems like a way to make sure I had the correct offset and bolt pattern to fit, since the 44x tractors use the same rear end, and axles as the 64x..

But, reusing the 44x rims means I have tires intended for 6 to 7 inch wide rims mounted on 8 inch wide rims (and took a few to figure out how to make them spread. 2 ratchet straps later I had them mounted). The 8 inch wide rims so make them look a little pregnant. But these do fit under the fender and behind the foot rests:

I also had these loaded with RIM Guard - Beet Juice, and they get 10 gallons, 115 pounds in each tire. I've not had the tractor out since I mounted these. I'm still finishing hydraulic system modifications.

And those same tires are $84 each on Amazon..

Now I have a 1 year old pair of hte 7.60-16 SL tires to sell and a pair of turf tires for the 44x that have good tread, but are weather checked, they held air the 6 months before I scrapped the tractor, but their not new either..

Quote:
Originally Posted by shgreen1 View Post
Thanks for the replies.

So, I have found these tires Carlisle Farm Specialist R-1 7-16 C/6PR

https://www.tires-easy.com/7-16/carl...irecode/570001

Carlisle lists them as having a mounted diameter of 29.1", so it should clear the fender, and a mounted width of 8.1" which is pretty close to what is mounted on there now.
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1973 Case 646 (w/Custom Power Steering)
1968 Case 155
1958 JI Case 310 Terratrac Crawler Loader
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post #11 of 11 Old 04-27-2019, 12:47 PM
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Re: 646 Rear Tires

Quote:
Originally Posted by shgreen1 View Post
Thanks for the replies.

So, I have found these tires Carlisle Farm Specialist R-1 7-16 C/6PR

https://www.tires-easy.com/7-16/carl...irecode/570001

Carlisle lists them as having a mounted diameter of 29.1", so it should clear the fender, and a mounted width of 8.1" which is pretty close to what is mounted on there now.

Of course, I'll need new wheels, as these tires mount on 16" wheels. I've found these, 16" x 6" Implement / Agricultural Wheel 6-6" bolt circle, 4 5/8" center bore, +1 1/8" offset, 2800 lbs. capacity.

https://www.southwestwheel.com/p-2003-106307.aspx

I've seen elsewhere here, that the original wheels have a 1 1/4" offset and these wheels have a 1 1/8" offset. Does anyone think this 1/8" difference will be a problem?

I'm very excited to have a more useful tire on this tractor than the passenger tires that are currently mounted.....
Try this number 937-935-4833 his name is Steve he may be able to help you with rims. My source did not have rims
Good luck
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