The Midnight Special is a steel road-plus frameset for rough tarmac, gravel detours and long days exploring. Choose a 650b or 700c wheel build, with clearance for comfortable, high-volume tyres and mounts for racks and mudguards.
Includes the matching chromoly frame and fork, Surly axles and a 30mm seatpost clamp. Build components are sold separately.
| Frame | 4130 Chromoly Natch tubing; double-butted main triangle, TIG welded and E.D. coated |
|---|---|
| Fork | 4130 chromoly; TIG welded, brazed lugs and E.D. coated |
| Fork dimensions | 400mm axle-to-crown; 50mm offset on 54cm, 40mm on 56cm and 58cm |
| Tyre clearance without mudguards | 27.5 × 2.35 inches or 700c × 42mm |
| Tyre clearance with mudguards | 650b × 50mm or 700c × 38mm |
| Axles | Front 12 × 100mm; rear 12 × 142mm. Rear 10 × 135mm requires separate Surly 10/12 adapter washers |
| Brakes | Flat-mount 140; 160mm maximum rotors; 25mm rear mount thickness |
| Headset / steerer | ZS44/28.6 upper, EC44/30 lower; straight 1⅛ inch steerer |
| Seatpost / clamp | 27.2mm / 30mm; not dropper compatible |
| Bottom bracket | 68mm threaded, 1.37 × 24 TPI |
| Maximum chainrings | 1×: 44T; 2×: 34/50T; 3×: 30/39/50T |
| Mounts | Bottle, rack and front/rear mudguard mounts; downtube shifter bosses. Cable housing stops not included |
Feast your eyes on our Custom Build Gallery - every bike spec’d and built in the Bicycle Junction Workshop. From pinstriped cargo bikes for breweries to ground-up world tour machines, we’ve done it all.
Click below for inspiration, and get in touch to start building your own dream bike.

