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For the USA, the front wheels would have been 21X4.40/4.50, or maybe 30X3-1/2. The closed cab was announced in April of 1924, and remained the same through 1927, including the hood and fenders, which were not updated to passenger car style. So that truck as it sits could be 1924 to 1927. Of course someone may have installed the close cab on earlier chassis. Ford built the last of the Model T engines in about 1941. I am pretty sure on this; Ford was still assembling TT's after car production ended. My best guess is, a replacement engine was installed in 1928 or this TT could have been a very late assembly. We may never know what transpired close to 100 years ago.