The Surly Disc Trucker 700c (2024) is a touring bike — representative silhouette: Touring. We have read 1 specification sheet (Surly Bikes) and recorded 26 fit facts from it. 13 of the 16 measurements a touring 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.
| Bottom bracket shell | BSA / English threaded, 68 mm |
|---|---|
| Seat clamp diameter | 30 mm |
| Rear axle spacing | Thru-axle, 142 × 12 mm |
| Rear thru-axle thread | M12 × 1.5 |
| Rear thru-axle length | 162 mm |
| Seatpost diameter | 27.2 mm |
| Seatpost shape | Round |
| Maximum tyre width (frame) | 47 mm |
| Wheel size (ISO bead seat) | 700c / 29" (ISO 622) |
| Steerer tube | 1-1/8" straight threadless |
| Headset, upper | EC34/28.6 |
| Headset, lower | EC34/30 |
| Front axle spacing | Thru-axle, 100 × 12 mm |
| Brake mount, front | Flat mount |
| Brake mount, rear | Flat mount |
| Rotor interface (hubs) | 6-bolt (ISO) |
| Maximum rotor, front | 180 mm |
| Maximum rotor, rear | 180 mm |
| Brake actuation | Mechanical (cable) disc |
| Freehub body | Shimano HG, 8/9/10-speed body (also 11/12-speed MTB HG cassettes) |
| Rear speeds | 9 speeds |
| Shift actuation | Mechanical (cable) |
| Chain standard | 9-speed (6.6 mm) |
| Stem bar-clamp diameter (fitted stem) | 31.8 mm |
| Handlebar clamp diameter (fitted bar) | 31.8 mm |
| Steerer clamp (stem) | 1-1/8" (28.6 mm) |
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 touring bike): Derailleur hanger · Brake pad shape (fitted calipers) · 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 3 of the 16 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.