Here are the options for your Father's Day bike quest.
Based on the inseam, he would be a 19". We *currently* have the KHS Zaca and the KHS SixFifty 300 in stock. Both are in boxes and will be assembled upon purchase. We would be happy to store them in house free of charge through Thursday June 18th.
The Zaca has 29" wheels and the SixFifty 300 has 27.5" wheels. The SixFifty has lockout on the fork and is a 1x9 drivetrain. The Zaca does not have lockout on the fork and is a 3x8 drivetrain. Both are solid entry-level bicycles.
If you have any questions, feel free to text us at 972-347-5337.