Assuming you mean 24c, which measure exactly 25mm wide on my 20mm rims, and 21mm high from the top of the rim.
Tubs were 24c. Clinchers/Tubulars are now both avail in 25c/27c. :-)
@JB started
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Assuming you mean 24c, which measure exactly 25mm wide on my 20mm rims, and 21mm high from the top of the rim.