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Giant Defy, Medium Frame, Grey, Excellent Condition, Triathlon Bars - $350
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Giant uses "Compact Road" design, which features a significantly sloping top tube. This makes traditional seat tube measurements in inches less relevant than the effective top tube length or stack/reach.
Giant Bicycles
Giant Bicycles
+1
Approximate Size Correlation
Small (S): Often has a seat tube length of around 43–46 cm (approx. 17–18 inches) center-to-top.
Medium (M): Often has a seat tube length around 47–50 cm, but with the sloping top tube, a "17-inch" measurement often aligns best with the Small/Medium category.
Ivanhoe Cycles
Ivanhoe Cycles
+2
Key Considerations
Sloping Top Tube: Because the seat tube is short, the seatpost on a Giant Defy often shows a significant amount, which is designed to increase compliance and comfort.
D-Fuse Seatpost: Many modern Defy models use a proprietary D-shaped seatpost to absorb vibrations.
Sizing Recommendations:
Small (S): Typically fits riders 5'4" to 5'8" (162–172 cm).
Medium (M): Typically fits riders 5'7" to 5'11" (169–179 cm).