Surly: Lowside Frameset - 2020

Surly: Lowside Frameset - 2020

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Surly: Lowside Frameset - 2020

The Lowside is an frameset that is a rad mountain bike that is perfect for riding on the singletrack.


Trail Bikes

Trail bikes are deeply rooted in the Surly DNA. In fact, their trail category has pioneered numerous trends in the mountain biking world, from 29ers and fat bikes to the invention of Plus tires. When it comes to trail or rigid mountain bike frames, they know what the hell they’re talking about. Their Trail category is proof and is made of pudding or something like that.


Color: Green Astro Turf, Rainbow in the Dark

Size: XS, S, M, L, XL


The Lowside is also available as a complete bike.



Frame Construction

4130 Chromoly, Natch tubing, double-butted main triangle, TIG welded, ED coated

Fork Construction

4130 Chromoly, Natch tubing, double-butted tapered fork blades, TIG welded, ED coated

Rear Dropout Configuration

Horizontal slotted with optional vertical dumpout

Rear Hub Spacing

"Gnot-Boost" 145mm

12 x 142mm or 12 x 148mm (Surly axle included)

10 x 135mm with Surly 10/12 Adapter Washers (not included)

Front Hub Spacing

15 x 110mm (Surly axle included)

Rear Brake

Disc - 51mm I.S. (203mm max rotor)

Front Brake

Disc - 51mm I.S. (203mm max rotor)

Head Tube


Steerer Tube

Ø28.6mm (1-1/8")

Crown Race

Ø30mm (1-1/8")

Stock Headset Upper (S.H.I.S)


Stock Headset Lower (S.H.I.S)


Seat Collar




Front Derailleur (Clamp)

High direct mount top-pull (Ø34.9mm)

26mm offset adapter (not included) for 142 or 135mm rear hub spacing

29mm offset adapter (not included) for 148mm rear hub spacing

Max Chainring (CL) [3]

1x (Mtn): 33T

1x (Boost): 36T

Bottom Bracket

73mm threaded (1.37" x 24TPI)

Tire Clearance Frame [1]/[2]

26 x 3.0"

27.5 x 2.8"

Tire Clearance Fork [1]

26 x 3.0"

27.5 x 2.8"

Rigid Fork Spec

420 x 47mm

Max Suspension Fork Length [4]

490 x 47mm (26 100mm)

Bottle Mounts Frame

1 Standard

Bottle Mounts Fork


Rack Mounts Frame


Rack Mounts Fork


Fender Mounts Frame


Fender Mounts Fork


Other Features

Internal dropper post routing compatible

[1] Different tire and rim combinations will result in different clearances. 

[2] Depending on drivetrain configuration, tire clearance may be limited by the chain and not the frame.
[3] Listed chainring clearance is worst case scenario.  Clearances vary widely depending on components and configurations.
[4] Suspension fork length listed at full extension (not at sag) 



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