Defy Advanced SL

The Advanced SL tier represents the pinnacle of the Defy family, utilizing Giant’s highest-grade carbon to achieve a remarkably low frame weight. The flagship SL 0 build is a premium, no-compromise package equipped with a SRAM Red eTap AXS drivetrain and an integrated Quarq power meter. To suit the bike’s endurance mission, Giant specs a sub-compact chainring pairing and a wide-range cassette, providing a generous climbing gear that excels on steep gradients and long alpine days.

Rolling stock on the SL 0 features Cadex 36 Disc carbon wheels laced with carbon spokes. These lightweight, hookless rims contribute significantly to the bike’s rapid acceleration and low overall weight, though they do require strict adherence to tubeless tire compatibility and pressure limits. While the asking price for the SL 0 is undeniably high, it undercuts similarly equipped flagship models from rival brands. The value here lies in the exceptionally light frameset and the inclusion of top-tier components that would otherwise cost thousands as aftermarket upgrades.

Reviewers consistently praise the Defy Advanced SL for balancing race-like power transfer with exceptional vibration damping. By avoiding heavy shock absorbers, the bike maintains a direct connection to the pavement while effectively muting harsh road chatter. On rough surfaces, testers noted that the frame and D-Fuse components work together to isolate the rider from fatigue. The resulting ride quality is highly refined, with one reviewer describing the speed delivery as "more Bentley than Ferrari" (Cycling Weekly).

When climbing or sprinting, the dramatically reduced frame weight becomes obvious. Testers found that the bike "accelerates astonishingly quickly" (Road.cc) for an endurance model, responding eagerly to out-of-the-saddle efforts. However, this stability-focused platform does trade away some agility. The steering is intentionally deliberate, which keeps the bike composed on fast, unpredictable descents but lacks the nervous twitchiness of a pure climbing bike. Reviewers characterized the handling as "sharp, but never pin sharp" (Cycling Weekly), noting that while the steering feels "a little slower" (Cyclist) than a dedicated race machine, it tracks predictably through corners without suffering from understeer.