Frame, Fork, and Headset¶
The Pugsley was one of the first commercially available fat bike framesets, and its off set design remains its standout feature. Using 135 mm rear spacing with a 17.5 mm drive‑side offset, the frame lets fat tyres clear the chain and allows you to swap front and rear wheels. With the right rim and drivetrain setup, a Pugsley will run tyres up to about 4.8 inches wide and accepts 26″, 27.5″ (650 b) and 29″/700 c wheelsets. Both frame and fork come with braze‑ons for racks, bottle cages and fenders. For detailed geometry and specifications, see the official Pugsley frame sheet.
| Feature | Specification |
|---|---|
| Frame material | 4130 CroMoly steel, double‑butted main triangle |
| Rear dropouts | 135 mm spacing with 17.5 mm drive‑side offset (swap‑able front/rear) |
| Tyre/wheel options | Up to about 4.8 in tyres; can run 26″, 27.5″ (650 b) and 29″/700 c wheels |
| Tyre clearance (front) | Up to about 4.8 inches (depending on fork/wheel setup) |
| Frame weight (M size) | ~5.5 lb (2.49 kg) |
| Recommended weight limit | ~300 lb (rider + cargo) |
- Geometry – measurements and angles for different frame sizes.
- Forks – more detail on the Pugsley’s offset fork and alternatives.
- Headsets – information about headsets and steering components.
Looking to reinforce or modify your frame? See the frame reinforcements page for gusset options and upgrades.
References¶
- Pugsley Frame Sheet (PDF) – official Surly frameset specification with dimensions, dropout offset and spacing, brake compatibility and recommended tyre clearance.