Rear tires on an 806....

My 806 had 18.4 x 34 bias tires on it. They were shot, rotten, & splitting out. No more goody left. Been trying to find some good used tires for quite a while. Couldn't see paying $600.00 a tire for chinese made ones. I came across a pair of Michelin 480/70R 34 XM 23 radials. They came off the front of a front wheel assist tractor. They have 75% tread or so and they only wanted $100.00 ea. I bought them. Can't find anything out about them even on the Michelin site. They measure about 3 inches less in diameter than the 18.4 34. They are pretty close to diameter of a 16.9 34 and the same width as the 18.4.
I know some guys say don't go any smaller rolling circumfirance than the 18.4 x 34 on an 806. My heaviest load would be 14'sweeps/chisels for summer fallowing. Couldn't really see passing them up. Any thoughts? Thanks, Dan
 
smaller the tire, slower your gears are/slower you travel, but...MORE POWER assuming that you can grip and "hook up" to the ground with these tires. I say what the hay...use them. 18.4 34 are getting VERY hard to come by used. Most everything went to 38 and bigger. Just my .02......I ALWAYS am looking for used 18.4 34!
 

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