From the website linked below... what "SL" means on a farm tire...
"Since time is money for business these days, the agricultural industry wanted to transport implements from dealer to farm and from field to field at a faster rate. Standard implement tires had an "SL"suffix to the basic size (such as 11L-15SL). The "SL" meant service limited to agriculture and was limited to 25 mph transport speed. Going to higher speeds required qualification to the same regulations that govern highway tires. To handle this need, a new classification of implement tire was developed. The "FI" suffix denotes the highway speed qualified implement tires can be used to transport implements. Even though the transport speed is less than the load rating on the "SL" tires, the in-field load capacity of the tires actually exceeds the in-field capacity of the "SL" tires. These new "FI" tires, such as "F1" 11L-15FI, offer you great opportunity to improve the time efficiency of your operation. "
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Today's Featured Article - New Hitches For Your Old Tractor - by Chris Pratt. For this article, we are going to make the irrational and unlikely assumption that you purchased an older tractor that is in tip top shape and needs no immediate repairs other than an oil change and a good bath. To the newcomer planning to restore the machine, this means you have everything you need for the moment (something to sit in the shop and just look at for awhile while you read the books). To the newcomer that wants to get out and use the machine for field work, you may have already hit a major roadblock. That is the dreaded "proprietary hitch". With the exception of the
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