Surly Lowside frameset XS

Singlespeed perfect for urban trails, pump tracks or just fun on two wheels.

Colour : New Pig Smell

Size : XS (last pc)

The new model "blue" will be released in March/April 2026 - you can already pre-order it.

Specification :

Single speed mountain bike with trail character

- Ideal for single trails, urban adventures and relaxed rides

- Inspired by BMX bikes - "the adult bike of your childhood"

🧱 F rame & fork

- Material: 4130 chromoly steel, Surly Natch tubing

- Processing: Double butted main triangle, TIG-welded, ED-coated

- Fork: Rigid chromoly fork with butted fork blades

- Finish: "New Pig Smell" - distinctive, matt look

⚙️ Geometry & compatibility

- Wheel size: 27.5" (650B)

- Max. Tyre width: up to 27.5 x 2.8"

- Fork mount: 420 mm Axle-to-Crown, 47 mm offset

- Head tube: ZS44/EC44 (44 mm)

- Bottom bracket: BSA 73 mm, threaded

- Seatpost: Ø30.9 mm, dropper compatible

- Seat clamp: Ø33.1 mm

🔩 Axle & brake standard

- Rear triangle: Gnot-Boost 145 mm - compatible with 12x142 mm, 12x148 mm or 10x135 mm (with adapter)

- Front triangle: 15x110 mm thru axle

- Brake: disc brake, IS 51 mm, max. 203 mm rotor

🧴 Equipment & features

- Bottle cage: 1 standard mount

- No mudguard or pannier rack mounting

- Singlespeed-optimised, but with options for conversions

Conclusion: The Surly Lowside is a minimalist, low-maintenance frameset for purists looking for a playful, stable bike - perfect for urban trails, pump tracks or simply having fun on two wheels.