The Giant Defy Advanced 2 (2025) is a road bike — representative silhouette: Road endurance. We have read 1 specification sheet (Giant Bicycles) and recorded 10 fit facts from it. 7 of the 14 measurements a road bike needs to answer fit questions are on file; 0 are confirmed by two independent sources. Where a measurement is missing, we say so below — we do not guess.
| Rear axle spacing | Thru-axle, 142 × 12 mm |
|---|---|
| Seatpost shape | D-shaped |
| Wheel size (ISO bead seat) | 700c / 29" (ISO 622) |
| Front axle spacing | Thru-axle, 100 × 12 mm |
| Brake actuation | Hydraulic disc |
| Freehub body | Shimano HG, 11-speed road body (+1.85 mm) |
| Rear speeds | 12 speeds |
| Crank spindle | Shimano Hollowtech II, 24 mm |
| Chain standard | 12-speed HG+ / Eagle (5.25 mm) |
| Tubeless-ready rims | Tubeless-ready |
Confidence: every fact above comes from a single cited source — "derived" on our lattice; none is verified by a second independent publisher yet. A verdict that rests on a safety-critical fact therefore stops at "unknown" rather than "fits".
Not on file (required for a road bike): Bottom bracket shell · Derailleur hanger · Seatpost diameter · Maximum tyre width (frame) · Brake mount, front · Brake mount, rear · Pedal thread. The sheet we read does not state them; until a source does, every fit question that needs one of these reads "unknown" — or "unknown — safety-critical" where a guess could hurt you.
- Why do so many verdicts on this bike read "unknown"?
- Because a verdict needs the bike's measurement for every dimension a part requires, and 7 of the 14 required measurements are not on file. "Unknown" means we could not check — not that it fits, and not that it does not.
- Will the verdicts change?
- Yes. When a second independent source confirms a measurement — or a first one states a missing one — the verdicts are recomputed from the new facts. Nothing on this page is typed by hand.