Surly Krampus 29+ Gravel Bike – Built for Epic Trails

Crafted entirely from Surly’s proprietary 4130 CroMoly steel, this rugged rig combines classic durability with modern versatility. Ideal for gravel grinding, mixed-terrain adventures or fire-road exploration, its beefy 29+ wheel system clears up to 3.0″ tires while maintaining nimble handling.

Key Innovations
– Gnot-Boost™ rear end (145mm spacing) adapts to Boost 148mm axles or standard 142mm/135mm setups
– Double-butted mainframe tubes & 44mm raised headtube for all-day comfort
– Internal dropper post routing (30.9mm seat tube) enables stealthy suspension integration
– Adjustable rear dropouts accommodate single-speed conversions or chain tensioning

Technical Specifications
| Component | Specification |
|———————|———————————-|
| Wheel Size | 29+ (accepts 29×2.8″-3.0″ tires) |
| Frame Material | 4130 CroMoly Steel |
| Rear Hub Spacing | Gnot-Boost™ 145mm |
| Brake Type | Disc-ready |
| Effective Top Tube | 587mm (Small size) |

Sizing Guide
Height recommendations for optimal geometry:
▸ Small: 162-173cm (5’4″ – 5’8″)
▸ Medium: 170-183cm (5’7″ – 6’0″)
▸ Large: 180-190cm (5’11” – 6’3″)
▸ XLarge: ≥188cm (6’2″ – 6’6″)

Why Choose This Gravel Beast?
Unlike standard hardtails that compromise on tire clearance, the Krampus delivers:
✓ 20% more mud/shake room vs traditional 29ers
✓ Frame durability tested on Alaskan backroads since 2009
✓ Modular build options (single-speed or geared)

Condition Note: This Grade B demo shows light cosmetic wear but retains structural integrity – perfect for budget-conscious adventurers seeking proven performance.

Best For: Long-distance gravel routes • Technical fire roads • Winter commuter bikes needing extra traction