Travis Kelce's in his Industrial Revolution era ... trading horseback riding for car racing -- 'cause he just arrived at the 2024 Miami Grand Prix!
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Videos of the Kansas City Chiefs star are starting to populate online ... and, we gotta say TK's rocking a far chiller -- and, definitely more comfortable-looking ensemble -- for today's event.
Check out the clip ... Travis walks in wearing a loose-fitting green shirt and matching shorts, backward hat and sunglasses on -- a far cry from his full suit and fedora 'fit at the Kentucky Derby Saturday.