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Lowside

Lowside

⚠️ WARNING: This product can expose you to chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

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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

Specifications

Geometry

Geometry Diagram

Rigid Fork

SIZE XS SM MD LG XL
Rider Height 1.42m+ 1.52m+ 1.65m+ 1.75m+ 1.85m+
Reach 414.5 429.3 445.3 461.0 477.0
Stack 542.2 560.3 574.4 588.5 602.5
Head Tube Angle 70.0° 70.0° 70.0° 70.0° 70.0°
Head Tube Length 110.0 125.0 140.0 155.0 170.0
Seat Tube Length 316.0 366.0 416.0 466.0 516.0
BB Drop 55.0 55.0 55.0 55.0 55.0
Wheelbase 1068.0 1089.0 1110.0 1131.0 1152.0
Chainstay Length 425.0 425.0 425.0 425.0 425.0
Top Tube Length, Actual 562.4 575.6 589.7 608.5 630.4
Top Tube Length, Effective 570.0 590.0 610.0 630.0 650.0
Seat Tube Angle 74.0° 74.0° 74.0° 74.0° 74.0°
Standover Height 700.0 729.0 762.0 792.0 823.0
Stem Length 60 60 60 60 60
Stem Angle 6° 6° 6° 6° 6°
Handlebar Width 820 820 820 820 820
Crank Length 170 170 175 175 175
Fork Length 420 420 420 420 420
Fork Rake 47.0 47.0 47.0 47.0 47.0

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

Suspension Fork

SIZE XS SM MD LG XL
Rider Height 1.42m+ 1.52m+ 1.65m+ 1.75m+ 1.85m+
Reach 388.0 403.7 419.5 435.5 451.0
Stack 564.5 579.8 593.5 608.0 622.0
Head Tube Angle 67.3° 67.4° 67.5° 67.5° 67.6°
Head Tube Length 110.0 125.0 140.0 155.0 170.0
Seat Tube Length 316.0 366.0 416.0 466.0 516.0
BB Drop 35.6 36.0 36.4 36.7 37.0
Wheelbase 1077.0 1098.0 1119.5 1140.5 1161.5
Chainstay Length 425.0 425.0 425.0 425.0 425.0
Top Tube Length, Actual 562.4 575.6 589.7 608.5 630.4
Top Tube Length, Effective 578.0 598.0 618.0 638.0 658.0
Seat Tube Angle 71.4° 71.4° 71.5° 71.5° 71.6°
Standover Height 729.0 755.0 787.0 817.0 848.5
Stem Length 60 60 60 60 60
Stem Angle 6° 6° 6° 6° 6°
Handlebar Width 820 820 820 820 820
Crank Length 170 170 175 175 175
Fork Length 468.0 468.0 468.0 468.0 468.0
Fork Rake 42.0 42.0 42.0 42.0 42.0

*100mm suspension fork @25% sag

Frame Specs

  • 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

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