Skip to main content.
Bikes. Parts. Chaos.
Safety
Begin typing to search, use arrow keys to navigate, click or press Enter to select an item.

Your BMX Bike All Grown Up

Lowside is like the grownup version of the bike you rode when you were a kid and still had hopes and dreams and some semblance of ambition. It’s just as happy riding singletrack as it is parked outside your favorite drinking establishment.

Lowside is a single speed mountain bike. Singlespeeding has been a part of Surly’s DNA since day one when we launched the 1x1 Rat Ride. After a lot of Homie Fall Fests and more feats of strength than we can recall, we decided to discontinue it a couple years back. Lowside picks up right where the 1x1 left off.

“Some have dubbed the Lowside the ultimate pub cruiser.”

  • Modern trail standards: dropper post compatibility, 44mm headtube, Gnot-Boost rear spacing, thru-axles
  • Compatibility with most mountain bike standards makes it the perfect parts bin bike (no rim brakes allowed though)
  • Spec'd in alternating years with 26 x 3” or 27.5 x 2.8” tires, the Lowside remains capable of running either option

Lowside side view on BMX track
Lowside Natch decal
Lowside stem and handlebar detail
Lowside tire spec
Lowside rear dropout, cog, brake caliper and rotor
Lowside dumpster fire seat tube decal
Lowside front view
Lowside rear view
Lowside leaning up against wall
Lowside on ridden on track
Lowside bars, stem and brake levers
Lowside being ridden on berm
Lowside air time
Lowside railing berm

Specifications

Lowside Geometry
units:

Select a few bike sizes to compare.

SIZE XS SM MD LG XL
Rider Height 4'8"+ 1.42m+ 5'0"+ 1.52m+ 5'5"+ 1.65m+ 5'9"+ 1.75m+ 6'0"+ 1.85m+
Reach 16.3 414.5 16.9 429.3 17.5 445.3 18.1 461.0 18.8 477.0
Stack 21.3 542.2 22.1 560.3 22.6 574.4 23.2 588.5 23.7 602.5
Head Tube Angle 70.0° 70.0° 70.0° 70.0° 70.0°
Head Tube Length 4.3 110.0 4.9 125.0 5.5 140.0 6.1 155.0 6.7 170.0
Seat Tube Length 12.4 316.0 14.4 366.0 16.4 416.0 18.3 466.0 20.3 516.0
BB Drop 2.2 55.0 2.2 55.0 2.2 55.0 2.2 55.0 2.2 55.0
Wheelbase 42.0 1068.0 42.9 1089.0 43.7 1110.0 44.5 1131.0 45.4 1152.0
Chainstay Length 16.7 425.0 16.7 425.0 16.7 425.0 16.7 425.0 16.7 425.0
Top Tube Length, Actual 22.1 562.4 22.7 575.6 23.2 589.7 24.0 608.5 24.8 630.4
Top Tube Length, Effective 22.4 570.0 23.2 590.0 24.0 610.0 24.8 630.0 25.6 650.0
Seat Tube Angle 74.0° 74.0° 74.0° 74.0° 74.0°
Standover Height 27.6 700.0 28.7 729.0 30.0 762.0 31.2 792.0 32.4 823.0
Stem Length 2.36 60 2.36 60 2.36 60 2.36 60 2.36 60
Stem Angle 6° 6° 6° 6° 6°
Handlebar Width 32.2 820 32.2 820 32.2 820 32.2 820 32.2 820
Crank Length 6.7 170 6.7 170 6.9 175 6.9 175 6.9 175
Fork Length 16.5 420 16.5 420 16.5 420 16.5 420 16.5 420
Fork Rake 1.9 47.0 1.9 47.0 1.9 47.0 1.9 47.0 1.9 47.0

*Standover is measured from the top of the TT, at the center, with a tire measuring approximately Ø710mm

Select a few bike sizes to compare.

SIZE XS SM MD LG XL
Rider Height 4'8"+ 1.42m+ 5'0"+ 1.52m+ 5'5"+ 1.65m+ 5'9"+ 1.75m+ 6'0"+ 1.85m+
Reach 15.3 388.0 15.9 403.7 16.5 419.5 17.1 435.5 17.8 451.0
Stack 22.2 564.5 22.8 579.8 23.4 593.5 23.9 608.0 24.5 622.0
Head Tube Angle 67.3° 67.4° 67.5° 67.5° 67.6°
Head Tube Length 4.3 110.0 4.9 125.0 5.5 140.0 6.1 155.0 6.7 170.0
Seat Tube Length 12.4 316.0 14.4 366.0 16.4 416.0 18.3 466.0 20.3 516.0
BB Drop 1.4 35.6 1.4 36.0 1.4 36.4 1.4 36.7 1.5 37.0
Wheelbase 42.4 1077.0 43.2 1098.0 44.1 1119.5 44.9 1140.5 45.7 1161.5
Chainstay Length 16.7 425.0 16.7 425.0 16.7 425.0 16.7 425.0 16.7 425.0
Top Tube Length, Actual 22.1 562.4 22.7 575.6 23.2 589.7 24.0 608.5 24.8 630.4
Top Tube Length, Effective 22.8 578.0 23.5 598.0 24.3 618.0 25.1 638.0 25.9 658.0
Seat Tube Angle 71.4° 71.4° 71.5° 71.5° 71.6°
Standover Height 28.7 729.0 29.7 755.0 31.0 787.0 32.2 817.0 33.4 848.5
Stem Length 2.36 60 2.36 60 2.36 60 2.36 60 2.36 60
Stem Angle 6° 6° 6° 6° 6°
Handlebar Width 32.2 820 32.2 820 32.2 820 32.2 820 32.2 820
Crank Length 6.7 170 6.7 170 6.9 175 6.9 175 6.9 175
Fork Length 18.4 468.0 18.4 468.0 18.4 468.0 18.4 468.0 18.4 468.0
Fork Rake 1.7 42.0 1.7 42.0 1.7 42.0 1.7 42.0 1.7 42.0

*100mm suspension fork @25% sag

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

Ø44mm

Steerer Tube

Ø28.6mm (1-1/8")

Crown Race

Ø30mm (1-1/8")

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

ZS44/28.6

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

EC44/30

Seat Collar

Ø33.1mm

Seatpost

Ø30.9mm

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

N/A

Rack Mounts Frame

N/A

Rack Mounts Fork

N/A

Fender Mounts Frame

N/A

Fender Mounts Fork

N/A

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) 

Support

Frame Warranty

LIMITED WARRANTY

This Surly product is warranted against defects in materials and workmanship for three years from the date of retail purchase of the product, subject to the limitations detailed below. Save your dated receipt for proof of purchase.

This warranty does NOT cover the following:

  • Damage due to improper assembly or follow-up maintenance or lack of skill, competence or experience of the user or assembler
  • Products that have been modified, neglected, used in competition or for commercial purposes, misused or abused, involved in accidents or anything other than normal use
  • Installation of components, parts or accessories not originally intended for or compatible with bicycle as sold
  • Damage or deterioration to the paint, surface finish, aesthetics or appearance of the product
  • Normal wear and tear
  • Labor required to remove and/or refit and re-adjust the product within the bicycle assembly

This limited warranty is expressly limited to the repair or replacement of a defective product, at the option of Surly, and is the sole remedy of the warranty. This limited warranty applies only to the original purchaser of the Surly product and is not transferrable. This warranty applies only to products purchased through an authorized dealer or distributor. In no event shall Surly be liable for any loss, inconvenience or damage, whether direct, incidental, consequential, or otherwise resulting from breach of any express or implied warranty or condition, of merchantability, fitness for a particular purpose, or otherwise with respect to our products except as set forth herein.

This limited warranty gives the consumer specific legal rights, and those rights and other rights may vary from place to place. This limited warranty does not affect your statutory rights.

TO THE EXTENT NOT PROHIBITED BY LAW, THESE WARRANTIES ARE EXCLUSIVE AND THERE ARE NO OTHER EXPRESS OR IMPLIED WARRANTIES OR CONDITIONS INCLUDING WARRANTIES OR CONDITIONS OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.