Surly Bikes
Lowside is the bike that gets you across town for a quick rip on singletrack, then over to the bar for a night out.
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)
- Clearance for 26” x 3” or 27.5” x 2.8” tires
Bike Capabilities
- 5/5 with Single Track
- 5/5 with Alley Exploration
- 5/5 with Homemade Jumps
- 5/5 with Pub Cruising
NOTE: You can ride your bike wherever the hell you want, but this is what we think this bike is best at.
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Where to Buy
Specifications
Build Kit
Frameset
| Frame |
Surly Lowside Frame 4130 Chromoly steel.
Main triangle double-butted. TIG-welded. ED Coated. Heat-Treated chain stays |
|---|---|
| Fork |
Surly Lowside Fork 4130 Chromoly steel.
Investment cast Surly 12mm horizontal dropouts with derailleur hanger, 145mm Gnot Boost spacing works with 142 or 148mm spaced hubs. Convertible to 135x10mm QR with Surly 10/12 adapter washers (sold separately) |
| Seatpost Clamp | Surly Stainless 33.1mm clamp |
Components
| Headset | Crane Creek |
|---|---|
| Brakes | ProMax DSK-300 |
| Brake Levers | ProMax |
| Rotors | ProMax 160/160mm |
| Shifters | N/A |
| Stem | 4 bolt, 31.8mm clamp |
| Handlebar | Surly Sunrise w/ Shim |
| Grip/Tape | Velo Lock-on style |
| Saddle | WTB Volt |
| Seatpost | 2 Bolt, 30.9mm |
Drivetrain
| Crankset | SRAM NX 32t |
|---|---|
| Bottom Bracket | SRAM Power Spline |
| Front Derailleur | N/A |
| Rear Derailleur | N/A |
| Cog or cogset | Surly 16t w/ spacer kit |
| Chain | KMC x10-1 |
Wheels
| Front Hub | Formula, 32h, Thru-Axle |
|---|---|
| Rear Hub | Formula, 32h, Thru-Axle |
| Rims | Alex MD40 |
| Tires | Surly Dirt Wizard 26 x 3" 60tpi |
Frameset
| Frame |
Surly Lowside Frame
Main triangle double-butted. TIG-welded. ED Coated. Heat-Treated chain stays |
|---|---|
| Fork |
Surly Lowside Fork
Investment cast Surly 12mm horizontal dropouts with derailleur hanger, 145mm Gnot Boost spacing works with 142 or 148mm spaced hubs. Convertible to 135x10mm QR with Surly 10/12 adapter washers (sold separately) |
| Seatpost Clamp | Surly Stainless 33.1mm clamp |
Components
| Headset | Cane Creek |
|---|---|
| Brakes | Promax DSK-300 |
| Brake levers | Promax |
| Rotors | ProMax 160/160mm |
| Shifters | n/a |
| Stem | Sunday Freeze top load 22.2mm clamp |
| Handlebar | Surly Sunrise |
| Grip/Tape | Velo Lock-on style |
| Saddle | WTB Volt |
| Seatpost | 2 Bolt, 30.9mm |
Drivetrain
| Crankset | SRAM NX 32t |
|---|---|
| Bottom Bracket | SRAM PS |
| Front Derailleur | n/a |
| Rear derailleur | n/a |
| Cog or cogset | Surly 17t w/ spacer kit |
| Chain | KMC X10 |
Wheels
| Front hub | Novatec, 32h, Thru-Axle |
|---|---|
| Rear hub | Novatec, 32h, Thru-Axle |
| Rims | WTB Scrapper i TCS |
| Tires | Maxxis Rekon 27.5x2.8 60tpi EXO |
Complete bike spec subject to change
Geometry
units:
- in
- mm
| 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 |
| 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 |
Frame Specifications
| 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 |
| 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) |
| Max Chainring (CL) [3] | 1x (Mtn): 33T |
| Bottom Bracket | 73mm threaded (1.37" x 24TPI) |
| Tire Clearance Frame [1]/[2] | 26 x 3.0" |
| Tire Clearance Fork [1] | 26 x 3.0" |
| 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)
FAQ & Reviews
Support
Downloads
- Lowside Frame Sheet
[pdf] - 584KB - Lowside Fork Instructions
[pdf] - 176KB - Bike Sizing Chart
[pdf] - 308KB - Sunrise Handlebar Instructions
[pdf] - 520KB - Wheel, Rim & Tire Instructions
[pdf] - 279KB
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.