I find documentation (Road & Track road test) that the '57 444 came to the US on 5.90-15 tires, and I can't imagine the '56 being different. I also see the same size listed in my 444/544 "Green Book" tire & wheel supplement page. The green book supplement does say that at some point ("late production" 544's - prolly '64 or so?) came on 6.00-15 tires.
And in case you haven't already figured it out, both sizes mentioned above were bias-ply tires, not radials... those did not appear on a Volvo as standard equipment until the P1800 was introduced with 165-15's (Pirelli Cinturato's) in 1961.
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Gary L - 142E ITB race car, 73 1800ES BlueBrick Racing Website YouTube Racing Videos
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