Forks¶

2005–2008 “63 mm” Model¶

• Narrow 63 mm rear spacing—most aftermarket 26" fat‐bike hubs use 100 mm/135 mm spacing, so builds are rare.
• Front forks: original Surly Pug forks were 100 mm spacing with an offset to clear 3.8" tires.

2009–2017 “100 / 135” Model¶

• Forks changed to standard 100 mm front spacing; many aftermarket forks fit straight in.
• Look for 100 mm Pugsley forks from Surly or aftermarket (e.g., Salsa Beargrease).

Headset Interactions¶

• Lightweight forks often require a zero-stack headset, whereas steel Surly forks use a 1 1⁄8” straight steerer.