Karate Monkey Trail Bike: Rugged Performance Meets Custom Engineering

For riders seeking precision on technical trails and confidence on rugged descents, the Karate Monkey delivers unmatched versatility with its refined design and durable construction. Built around a 100% Surly Chromoly steel frame and fork, this trail bike combines lightweight responsiveness with the legendary durability of steel—perfect for tackling everything from flowy singletrack to gnarly rock gardens.

Engineered for Control
The updated progressive trail geometry ensures stability at high speeds while maintaining agility on switchbacks. Paired with Surly’s Gnot-Boost rear dropout system (145mm spacing), this bike seamlessly accommodates 142/148/135mm hubs via simple washer adjustments, offering unmatched wheel size flexibility (29″ or 27.5″). Internal dropper seatpost routing (30.9mm tube ID) keeps your setup clean and maintenance-free, while clearance for 29×2.55″ or 27.5×3″ tires ensures maximum grip in demanding conditions.

Built to Last
Constructed with double-butted main triangles and a 44mm headtube for precise handling, the frame features Surly’s signature trumpet tubeset from the Instigator 2.0 design—delivering strength without sacrificing agility. Available in multiple drivetrain configurations and vibrant color options, this bike adapts to your riding style while maintaining its signature rugged aesthetic.

Perfect Fit for Every Rider
Surly’s intuitive sizing chart ensures optimal performance:
| Size | Rider Height |
|——|————–|
| XS | 5′ – 5’5″ |
| SM | 5’4″ – 5’8″ |
| MD | 5’7″ – 6′ |
| LG | 5’11” – 6’3″|
| XL | 6’2″ – 6’6″ |

Condition & Value
This demo model (Grade B) has been ridden but remains in excellent working order. Expect minor cosmetic wear (scratches/blemishes) and normal component aging—perfect for riders prioritizing performance over perfection.

Whether you’re crushing laps at your local trail center or exploring remote backcountry routes, the Karate Monkey’s blend of precision engineering and Surly toughness makes it an indispensable companion for serious adventurers.