Jim: There are a lot of answers to your questions, but the most important one is does the current traction suit you. There will also be a lot of opinions.
A tractor as heavy as the 826 with remaining you have will probably pull as much as it ever did on hard road, be marginally less in haying operations and depending on moisture will be between substancially less and useless in tillage operations.
I used to find keeping tractors off black top and hard gravel roads as much as possible greatly extended the life of tractor tires. When I was farming governments treated us much better in lisencing of farm trucks. I used to get my truck lisence 1/6 of commercial, insurance about the same. I rarely hauled a load behind my tractors on the road, often I'd load the tractors on lowboy for a 5 mile move. I had a loboy that I could run 1066 and folding wing disk or cultivator on quickly without unhitching. I think we have to tell our governments, if they want those damn tractors off the road, lets get back to sensible truck licencing, taxes and insurance.
About you tire and rim size, every tire is labled for ideal rim size. Ideal will give you optimum traction. I know being off an inch does affect traction. I had a neighbor go from 18.4x38 to 20.8x38 on a 986, said he gained very little until he changed the rim size. Personally I never changed a big tractor, however I saw the same results with 30-50 hp tractors.
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