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<p class="MsoNormal">Firestone has test results showing the 23 degree tread has better traction in field work.
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<p class="MsoNormal"><a href="https://www.farmprogress.com/tread-tread-demonstration-shows-benefit-tires-23-degree-bar-angle">https://www.farmprogress.com/tread-tread-demonstration-shows-benefit-tires-23-degree-bar-angle</a><o:p></o:p></p>
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<p class="MsoNormal">[Todd Markle]<span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">The oldest IH tractors I've seen original factory photos of with Firestone 23 degree tread was the 706, 806 series.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">I have never seen any photos of the previous series with them on. So if they were available in the mid to late 50’s, they must have been more expensive or not as
popular.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black"><img border="0" width="275" height="208" style="width:2.8645in;height:2.1666in" id="TIE.23050" src="cid:image002.jpg@01D4F6EF.A137C3B0" alt="thPCM1285P.jpg"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">[<span style="color:black"> Indiana Robinson
</span>]<span style="color:black">I can't pin down the date but we acquired my 1947 Farmall Cub in the late 1960's and it was wearing a "very weathered" pair of Firestone Field & Road (23 degree) tires on the back of it. It now wears a pair of turf tires and
has for many many years.<o:p></o:p></span></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">I was thinking that I started seeing the F&R's about the mid to late 1950's. That memory may be a bit slushy. :-)<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">[james]<span style="color:black">I probably saw Firestone ads in Farm Journal or Successful Farming around 1960 for the 23<sup>o</sup> tires.<o:p></o:p></span></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">[Ralph in Sask.] I don't remember ever seeing the 23 degree tractor tires until the late sixties. Or maybe I just wasn't paying attention.
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