IH sold several size pulleys for M tractors depending what was being run from the belt. Belt drives and pulleys were considered a attachment, so I don't yhink any one size was considered standard. Common was the 11 x 7.5 and a 12 x 8.5 and 13 x 8.5 were sold. The only advantage with iron was holding up better if left out in the weather. Fiber, paper pulleys griped belts better. IH was getting fiber pulleys for M size tractors until in 1951 or 52 when something happened to the supply. Think the company went out of buisness or quit making pulleys. IH then went to selling the iron ones for the next few years. Don't know if IH considered the iron ones less effective or they cost more, but for some reason IH considered the iron ones to be sold for emergency use on H, M size tractors when fiber pulleys were not available.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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