Re: 646 tires
I've had AMERICAN FARMER TRACTION IMPLEMENT I-3 7.60 x 15's on my 646 and they are good tires.. I wanted to go to the 160 pound combine weights, so I put 16 inch rims from a 446 on my tractor and used 7-16 Trupowers:
To follow up on tires for the 646 (or what I am running this season).
With the loader we are always looking for more ballast. it's like an obsession.. The little squirt can lift more than it can move.. AKA it lifts the rear wheels off the ground..
So, I picked up a set of 'Combine' weights that tip the scales at 160 pounds each. Which would take 4 - Case D 10's weights in each side to come close. and of course you'd have to find the D-10's and pay $$$$ for them.
BUT, the combine weights won't fit in the 15" rims on the loaders (there is apparently a 10 inch wide 15 inch rim that they WILL fit into) but for the standard oem 7 x 15" rims the 160 pound weights don't fit. The weights were designed for and DO fit 16 in rims, like the 4xx and 40xx tractors have.. Hmm, I have a 446 that I am scrapping. Does anyone make a tire that I could put on a 16 inch 446 rim and still fit under the fenders on the loader?
The size chart from the Carlisle catalog has some interesting data in it.. The 7 -16 tires stand almost 2 inches shorter than the 8 - 16 tires. And at 29 inches the Carlisle 7 - 16's are actually shorter than the "American Farmer" 7.60 x 15:
Carlisle 7 -16 on 8" wide 16" rim from 446 on the right. American Farmer 7.60 x 15 on the 646's original 7" wide by 15 rims on the left. The 16" tire is actually a 1/2 to 1 inch shorter than the 15".
Width wise the lugs on the Carlisle measure just a tag short of 7" wide while the American Farmer measure 7 1/4" And the Carlisle has deeper lugs but fewer of them.
1973 Case 646 (w/Custom Power Steering)
1968 Case 155
1958 JI Case 310 Terratrac Crawler Loader