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 - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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