Ivory tee shown back and front: the back has a big blue weekday gear meshing with a small orange weekend gear; the front has a small blue gear meshing with an orange pinion on the left chest.

Why Weekends Go Faster Gear Ratio T-Shirt, Funny Mechanical Engineer Gear Train Tee, Engineering Gift

Comfort Colors 1717 / Ivory / S
$29.99
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Ivory tee shown back and front: the back has a big blue weekday gear meshing with a small orange weekend gear; the front has a small blue gear meshing with an orange pinion on the left chest.
  • Ivory tee shown back and front: the back has a big blue weekday gear meshing with a small orange weekend gear; the front has a small blue gear meshing with an orange pinion on the left chest.
  • Back of an ivory Comfort Colors 1717 tee with the large Why Weekends Go Faster Gear Ratio print: a big blue weekday gear meshing with a small orange weekend gear.
  • Front of an ivory Comfort Colors 1717 tee with a small blue gear meshing with an orange pinion on the left chest.
  • Close-up of the Why Weekends Go Faster Gear Ratio artwork showing the MON–FRI spokes, the SAT/SUN pinion, the pitch circles and the gear ratio equation.
  • Ivory tee shown back and front: the back has a big blue weekday gear meshing with a small orange weekend gear; the front has a small blue gear meshing with an orange pinion on the left chest.
  • Back of an ivory Comfort Colors 1717 tee with the large Why Weekends Go Faster Gear Ratio print: a big blue weekday gear meshing with a small orange weekend gear.
  • Front of an ivory Comfort Colors 1717 tee with a small blue gear meshing with an orange pinion on the left chest.
  • Close-up of the Why Weekends Go Faster Gear Ratio artwork showing the MON–FRI spokes, the SAT/SUN pinion, the pitch circles and the gear ratio equation.
Why Weekends Go Faster Gear Ratio T-Shirt, Funny Mechanical Engineer Gear Train Tee, Engineering Gift

Why Weekends Go Faster Gear Ratio T-Shirt, Funny Mechanical Engineer Gear Train Tee, Engineering Gift

$29.99
Style
Color
Size

A 50-tooth weekday gear drives a 20-tooth weekend pinion. Gear ratio 2.5. The pinion spins two and a half times faster, which finally explains Sundays. The big gear's five spokes are Monday through Friday; the little one only has Saturday and Sunday.

What you get

  • Front: Left-chest blue 25-tooth gear driving an orange 10-tooth pinion, "Weekend Ratio 2.5 : 1"
  • Back: Large meshing spur gears: a blue 50-tooth driver with MON–FRI spokes and an orange 20-tooth SAT/SUN pinion, pitch circles, rotation arrows (ω2 = 2.5 ω1) and the gear ratio worked out
  • Printed with premium DTF transfers and heat-pressed by hand in Charleston, SC

Choose your shirt

  • Comfort Colors 1717: heavyweight 6.1 oz garment-dyed cotton, relaxed fit (S–3XL)
  • Bella+Canvas 3001: lightweight 4.2 oz Airlume cotton, softer retail fit (S–3XL)

Colors may vary slightly by screen.

Care

Wash inside out in cold water, tumble dry low or hang dry, don't iron the print.

Production & disclosure

Designed by Elevated Designs LLC using digital design tools, with AI assistance. Printed and pressed to order in Charleston, SC.

Factor of Safety Co. · mechanical engineers — designed by Elevated Designs and printed to order in Charleston, SC.

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