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The stiffness of your frame significantly influences the sensation you experience while riding your bike.

Stiffness was assessed using the protocols established by Germany’s TOUR magazine with size medium framesets. Each new frame was tested with its stock fork, providing the most accurate measure of how the bike performs and ensuring that performance translates to real-world riding.

Our testing determined how much the complete frameset flexed torsionally under load. Each frame was locked at the rear dropouts with lateral force applied to the fork. More frame stiffness means better cornering and response to rider input on the road. One of the key findings is that the flagship Defy Advanced SL provides up to 8.9 percent greater transmission stiffness than its top-of-the-line predecessor (2023 Defy Advanced Pro).

Increased frame stiffness means better power transmission, enabling the rider to reach and maintain higher speeds with less effort. The combination of lower weight and higher stiffness adds up to unrivaled overall efficiency.

ComponentStiffness Type2023 Defy Advanced ProNew Defy Advanced SLNew Defy Advanced ProNew Defy Advanced
ForkLateral (N/mm)6367.467.462.4
FramePedaling (N/mm)68.275.66464
Transmission Stiffness (Lateral Fork and Frame Pedaling)Transmission (N/mm)131.2143.0131.4126.4
Difference08.9% More (compared to 2023 Defy Advanced Pro).2% more (compared to 2023 Defy Advanced Pro)3.7% less (compared to 2023 Defy Advanced Pro)

For this comparison test, Giant defines a frameset as follows:

  • Size medium, unpainted, production frame
  • Production fork (uncut)
  • Headset/expander/top cap
  • Seatpost (seatpost included with frameset)
  • Seat clamp
  • Front and rear derailleur hanger/clamps
  • All production hardware (water bottle bolts, etc.)
2023 Defy Advanced ProNew Defy Advanced SLNew Defy Advanced ProNew Defy Advanced
Frame980 g785 g860 g860 g
Fork406 g345 g345 g381 g
Front Derailleur Hanger16 g16 g16 g13 g
Rear Derailleur Hanger13 g13 g13 g13 g
Expander35.7 g41.4 g41.4 g41.4 g
Top Cap6 g5.7 g5.7 g5.7 g
Headset and Spacers76 g98.2 g98.2 g98.2 g
Total Weight1532.7 g1304.3 g1379.3 g1415.3 g

Results

Difference between 2023 Defy Advanced Pro and New Defy RangeNew Defy Advanced SLNew Defy Advanced ProNew Defy Advanced
Frame195 g less120 g less120 g less
Fork61 g less61 g less61 g less
Front Derailleur Hanger0 g0 g0 g
Rear Derailleur Hanger0 g0 g0 g
Expander5.7 g more5.7 g more5.7 g more
Top Cap.3 g less.3 g less.3 g less
Headset and Spacers22.2 g more22.2 g more22.2 g more
Total Weight228.4 g less153.4 g less117.4 g less

Compared to the 2023 Defy Advanced Pro frameset, the new Defy Advanced SL version saves 228.4 grams. Furthermore, the new Defy Advanced Pro frameset weighs 153.4 grams less than the 2023 Defy Advanced Pro and the new Defy Advanced frameset weighs 117.4 grams less than the 2023 Defy Advanced Pro.

While improving stiffness and increasing compliance, the new Defy range also significantly boosts its overall efficiency (stiffness-to-weight) ratio.

Feature2023 Defy Advanced ProNew Defy Advanced SLNew Defy Advanced ProNew Defy Advanced
Transmission Stiffness*131.2 (N/mm)143 (N/mm)131.4 (N/mm)126.4 (N/mm)
Frameset Weight1.533 kg1.304 kg1.379 kg1.415 kg
Stiffness-to-Weight Ratio85.6109.695.289.3

*(Lateral fork and frame pedaling)

Results

Difference between 2023 Defy Advanced Pro and new Defy range

Results2023 Defy Advanced ProNew Defy Advanced SLNew Defy Advanced ProNew Defy Advanced
Stiffness-to-Weight Ratio85.628% More efficient11.2% More Efficient4.3% More Efficient