Re: Re: Re: Equal rear tires of unequal size

Subject: Re: Re: Re: Re: Equal rear tires of unequal size

Comments:
: : : : : : I put a new rear tire on my 9N this evening. It is noticeably taller (4 inches) than the old tire on the other side. Both of them are Goodyear 11.2-28 tires, but the new tire's sidewall is thicker. I have two questions: : : : : 1. Why did this happen? : : : : 2. Is it OK to run the tractor this way or do I need to buy a replacement for the other rear tire? : : : This will be very hard on the spider gears in the differential. I always match the rear tires as close as possible. Leroy : : : I noticed the same thing on my CASE 310. Have 13.9 x 24's, one is a General, the other a Goodyear. One is noticably taller than the other. If this were on a truck with a positrac, I'd have a concern, but a 5 mph, I really don't think it makes a heck of a lot of difference. After all, these tractors were made to plow in constantly on side hills and make turns. So why should it know otherwise? : : : Regards : : : Jeff King : : Its been a number of years since I was in the tire business so I don't know how much of this may have changed but at that time all major tire makers made three different grades of tractor rears. the "premium grade" was the best tire and the largest for its size, "original equipment" (this is what was shipped on most new tractors) was the mid grade and mid sized tire and "replacement" was the "El cheapo" and the smallest for its size. An "El-cheapo" 15.5 x 38 4-ply was often smaller than a 13.6 x 38 6-ply "premium" tire. : A minor difference in dia. won't ruin your spider gears in normal use. Think about it a minute, you have gears all through your tractor going like a bat out of hell, why shouldn't your spider gears "do a little work". If you pull a plow with one rear wheel in the furrow the "on-land" wheel ALWAYS slips more than the "furrow" wheel. :-)

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